diff --git a/lib/ArduinoJson/CHANGELOG.md b/lib/ArduinoJson/CHANGELOG.md
index 2148c6d7..c0a8b4b8 100644
--- a/lib/ArduinoJson/CHANGELOG.md
+++ b/lib/ArduinoJson/CHANGELOG.md
@@ -1,6 +1,46 @@
 ArduinoJson: change log
 =======================
 
+v7.3.0 (2024-12-29)
+------
+
+* Fix support for NUL characters in `deserializeJson()`
+* Make `ElementProxy` and `MemberProxy` non-copyable
+* Change string copy policy: only string literal are stored by pointer
+* `JsonString` is now stored by copy, unless specified otherwise
+* Replace undocumented `JsonString::Ownership` with `bool`
+* Rename undocumented `JsonString::isLinked()` to `isStatic()`
+* Move public facing SFINAEs to template declarations
+
+> ### BREAKING CHANGES
+>
+> In previous versions, `MemberProxy` (the class returned by `operator[]`) could lead to dangling pointers when used with a temporary string.
+> To prevent this issue, `MemberProxy` and `ElementProxy` are now non-copyable.
+>
+> Your code is likely to be affected if you use `auto` to store the result of `operator[]`. For example, the following line won't compile anymore:
+>
+> ```cpp
+> auto value = doc["key"];
+> ```
+>
+> To fix the issue, you must append either `.as<T>()` or `.to<T>()`, depending on the situation.
+>
+> For example, if you are extracting values from a JSON document, you should update like this:
+>
+> ```diff
+> - auto config = doc["config"];
+> + auto config = doc["config"].as<JsonObject>();
+> const char* name = config["name"];
+> ```
+>
+> However, if you are building a JSON document, you should update like this:
+>
+> ```diff
+> - auto config = doc["config"];
+> + auto config = doc["config"].to<JsonObject>();
+> config["name"] = "ArduinoJson";
+> ```
+
 v7.2.1 (2024-11-15)
 ------
 
diff --git a/lib/ArduinoJson/CMakeLists.txt b/lib/ArduinoJson/CMakeLists.txt
index 24584f02..b607bdb8 100644
--- a/lib/ArduinoJson/CMakeLists.txt
+++ b/lib/ArduinoJson/CMakeLists.txt
@@ -10,7 +10,7 @@ if(ESP_PLATFORM)
 	return()
 endif()
 
-project(ArduinoJson VERSION 7.2.1)
+project(ArduinoJson VERSION 7.3.0)
 
 if(CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME)
 	include(CTest)
diff --git a/lib/ArduinoJson/README b/lib/ArduinoJson/README
deleted file mode 100644
index 2593a33f..00000000
--- a/lib/ArduinoJson/README
+++ /dev/null
@@ -1,46 +0,0 @@
-
-This directory is intended for project specific (private) libraries.
-PlatformIO will compile them to static libraries and link into executable file.
-
-The source code of each library should be placed in an own separate directory
-("lib/your_library_name/[here are source files]").
-
-For example, see a structure of the following two libraries `Foo` and `Bar`:
-
-|--lib
-|  |
-|  |--Bar
-|  |  |--docs
-|  |  |--examples
-|  |  |--src
-|  |     |- Bar.c
-|  |     |- Bar.h
-|  |  |- library.json (optional, custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
-|  |
-|  |--Foo
-|  |  |- Foo.c
-|  |  |- Foo.h
-|  |
-|  |- README --> THIS FILE
-|
-|- platformio.ini
-|--src
-   |- main.c
-
-and a contents of `src/main.c`:
-```
-#include <Foo.h>
-#include <Bar.h>
-
-int main (void)
-{
-  ...
-}
-
-```
-
-PlatformIO Library Dependency Finder will find automatically dependent
-libraries scanning project source files.
-
-More information about PlatformIO Library Dependency Finder
-- https://docs.platformio.org/page/librarymanager/ldf.html
diff --git a/lib/ArduinoJson/appveyor.yml b/lib/ArduinoJson/appveyor.yml
index 3660d01a..cdcadc1f 100644
--- a/lib/ArduinoJson/appveyor.yml
+++ b/lib/ArduinoJson/appveyor.yml
@@ -1,4 +1,4 @@
-version: 7.2.1.{build}
+version: 7.3.0.{build}
 environment:
   matrix:
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2022
diff --git a/lib/ArduinoJson/extras/scripts/extract_changes.awk b/lib/ArduinoJson/extras/scripts/extract_changes.awk
new file mode 100644
index 00000000..d96d459d
--- /dev/null
+++ b/lib/ArduinoJson/extras/scripts/extract_changes.awk
@@ -0,0 +1,29 @@
+#!/usr/bin/awk -f
+
+# Start echoing after the first list item
+/\* / {
+    STARTED=1
+    EMPTY_LINE=0
+}
+
+# Remember if we have seen an empty line
+/^[[:space:]]*$/ {
+    EMPTY_LINE=1
+}
+
+# Exit when seeing a new version number
+/^v[[:digit:]]/ {
+    if (STARTED) exit
+}
+
+# Print if the line is not empty
+# and restore the empty line we have skipped
+!/^[[:space:]]*$/ {
+    if (STARTED) {
+        if (EMPTY_LINE) {
+            print ""
+            EMPTY_LINE=0
+        }
+        print
+    }
+}
diff --git a/lib/ArduinoJson/extras/scripts/get-release-body.sh b/lib/ArduinoJson/extras/scripts/get-release-body.sh
deleted file mode 100755
index 7c842c23..00000000
--- a/lib/ArduinoJson/extras/scripts/get-release-body.sh
+++ /dev/null
@@ -1,14 +0,0 @@
-#!/bin/bash
-
-set -eu
-
-TAG="$1"
-CHANGELOG="$2"
-
-cat << END
-## Changes
-
-$(awk '/\* /{ FOUND=1 } /^[[:space:]]*$/ { if(FOUND) exit } { if(FOUND) print }' "$CHANGELOG")
-
-[View version history](https://github.com/bblanchon/ArduinoJson/blob/$TAG/CHANGELOG.md)
-END
diff --git a/lib/ArduinoJson/extras/scripts/get-release-page.sh b/lib/ArduinoJson/extras/scripts/get-release-page.sh
index 9eb53e1f..10fa0877 100755
--- a/lib/ArduinoJson/extras/scripts/get-release-page.sh
+++ b/lib/ArduinoJson/extras/scripts/get-release-page.sh
@@ -14,5 +14,5 @@ date: '$(date +'%Y-%m-%d')'
 $(extras/scripts/wandbox/publish.sh "$ARDUINOJSON_H")
 ---
 
-$(awk '/\* /{ FOUND=1; print; next } { if (FOUND) exit}' "$CHANGELOG")
+$(extras/scripts/extract_changes.awk "$CHANGELOG")
 END
diff --git a/lib/ArduinoJson/extras/scripts/wandbox/publish.sh b/lib/ArduinoJson/extras/scripts/wandbox/publish.sh
index b3f7077f..611572f8 100755
--- a/lib/ArduinoJson/extras/scripts/wandbox/publish.sh
+++ b/lib/ArduinoJson/extras/scripts/wandbox/publish.sh
@@ -15,7 +15,7 @@ compile() {
   "code":$(read_string "$FILE_PATH"),
   "codes": [{"file":"ArduinoJson.h","code":$(read_string "$ARDUINOJSON_H")}],
   "options": "warning,c++11",
-  "compiler": "gcc-5.5.0",
+  "compiler": "gcc-head",
   "save": true
 }
 END
diff --git a/lib/ArduinoJson/extras/tests/Deprecated/containsKey.cpp b/lib/ArduinoJson/extras/tests/Deprecated/containsKey.cpp
index 1b508975..846e98fb 100644
--- a/lib/ArduinoJson/extras/tests/Deprecated/containsKey.cpp
+++ b/lib/ArduinoJson/extras/tests/Deprecated/containsKey.cpp
@@ -67,7 +67,7 @@ TEST_CASE("JsonDocument::containsKey()") {
 
 TEST_CASE("MemberProxy::containsKey()") {
   JsonDocument doc;
-  auto mp = doc["hello"];
+  const auto& mp = doc["hello"];
 
   SECTION("containsKey(const char*)") {
     mp["key"] = "value";
diff --git a/lib/ArduinoJson/extras/tests/JsonArray/CMakeLists.txt b/lib/ArduinoJson/extras/tests/JsonArray/CMakeLists.txt
index bb9719a3..2ee1a34d 100644
--- a/lib/ArduinoJson/extras/tests/JsonArray/CMakeLists.txt
+++ b/lib/ArduinoJson/extras/tests/JsonArray/CMakeLists.txt
@@ -13,7 +13,6 @@ add_executable(JsonArrayTests
 	nesting.cpp
 	remove.cpp
 	size.cpp
-	std_string.cpp
 	subscript.cpp
 	unbound.cpp
 )
diff --git a/lib/ArduinoJson/extras/tests/JsonArray/add.cpp b/lib/ArduinoJson/extras/tests/JsonArray/add.cpp
index 1527670a..f1ca5f20 100644
--- a/lib/ArduinoJson/extras/tests/JsonArray/add.cpp
+++ b/lib/ArduinoJson/extras/tests/JsonArray/add.cpp
@@ -17,31 +17,112 @@ TEST_CASE("JsonArray::add(T)") {
 
   SECTION("int") {
     array.add(123);
+
     REQUIRE(123 == array[0].as<int>());
     REQUIRE(array[0].is<int>());
     REQUIRE(array[0].is<double>());
+    REQUIRE(spy.log() == AllocatorLog{
+                             Allocate(sizeofPool()),
+                         });
   }
 
   SECTION("double") {
     array.add(123.45);
+
     REQUIRE(123.45 == array[0].as<double>());
     REQUIRE(array[0].is<double>());
     REQUIRE_FALSE(array[0].is<bool>());
+    REQUIRE(spy.log() == AllocatorLog{
+                             Allocate(sizeofPool()),
+                         });
   }
 
   SECTION("bool") {
     array.add(true);
-    REQUIRE(true == array[0].as<bool>());
+
+    REQUIRE(array[0].as<bool>() == true);
     REQUIRE(array[0].is<bool>());
     REQUIRE_FALSE(array[0].is<int>());
+    REQUIRE(spy.log() == AllocatorLog{
+                             Allocate(sizeofPool()),
+                         });
+  }
+
+  SECTION("string literal") {
+    array.add("hello");
+
+    REQUIRE(array[0].as<std::string>() == "hello");
+    REQUIRE(array[0].is<const char*>());
+    REQUIRE(array[0].is<int>() == false);
+    REQUIRE(spy.log() == AllocatorLog{
+                             Allocate(sizeofPool()),
+                         });
+  }
+
+  SECTION("std::string") {
+    array.add("hello"_s);
+
+    REQUIRE(array[0].as<std::string>() == "hello");
+    REQUIRE(array[0].is<const char*>() == true);
+    REQUIRE(array[0].is<int>() == false);
+    REQUIRE(spy.log() == AllocatorLog{
+                             Allocate(sizeofPool()),
+                             Allocate(sizeofString("hello")),
+                         });
   }
 
   SECTION("const char*") {
     const char* str = "hello";
     array.add(str);
-    REQUIRE(str == array[0].as<std::string>());
-    REQUIRE(array[0].is<const char*>());
-    REQUIRE_FALSE(array[0].is<int>());
+
+    REQUIRE(array[0].as<std::string>() == "hello");
+    REQUIRE(array[0].as<const char*>() != str);
+    REQUIRE(array[0].is<const char*>() == true);
+    REQUIRE(array[0].is<int>() == false);
+    REQUIRE(spy.log() == AllocatorLog{
+                             Allocate(sizeofPool()),
+                             Allocate(sizeofString("hello")),
+                         });
+  }
+
+  SECTION("serialized(const char*)") {
+    array.add(serialized("{}"));
+
+    REQUIRE(doc.as<std::string>() == "[{}]");
+    REQUIRE(spy.log() == AllocatorLog{
+                             Allocate(sizeofPool()),
+                             Allocate(sizeofString("{}")),
+                         });
+  }
+
+  SECTION("serialized(char*)") {
+    array.add(serialized(const_cast<char*>("{}")));
+
+    REQUIRE(doc.as<std::string>() == "[{}]");
+    REQUIRE(spy.log() == AllocatorLog{
+                             Allocate(sizeofPool()),
+                             Allocate(sizeofString("{}")),
+                         });
+  }
+
+  SECTION("serialized(std::string)") {
+    array.add(serialized("{}"_s));
+
+    REQUIRE(doc.as<std::string>() == "[{}]");
+    REQUIRE(spy.log() == AllocatorLog{
+                             Allocate(sizeofPool()),
+                             Allocate(sizeofString("{}")),
+                         });
+  }
+
+  SECTION("serialized(std::string)") {
+    array.add(serialized("\0XX"_s));
+
+    REQUIRE(doc.as<std::string>() == "[\0XX]"_s);
+    REQUIRE(spy.log() == AllocatorLog{
+                             Allocate(sizeofPool()),
+                             Allocate(sizeofString(" XX")),
+                         });
   }
 
 #ifdef HAS_VARIABLE_LENGTH_ARRAY
@@ -52,7 +133,12 @@ TEST_CASE("JsonArray::add(T)") {
 
     array.add(vla);
 
-    REQUIRE("world"_s == array[0]);
+    strcpy(vla, "hello");
+    REQUIRE(array[0] == "world"_s);
+    REQUIRE(spy.log() == AllocatorLog{
+                             Allocate(sizeofPool()),
+                             Allocate(sizeofString("hello")),
+                         });
   }
 #endif
 
@@ -99,61 +185,6 @@ TEST_CASE("JsonArray::add(T)") {
 
     REQUIRE(str == array[0]);
   }
-
-  SECTION("should not duplicate const char*") {
-    array.add("world");
-    REQUIRE(spy.log() == AllocatorLog{
-                             Allocate(sizeofPool()),
-                         });
-  }
-
-  SECTION("should duplicate char*") {
-    array.add(const_cast<char*>("world"));
-    REQUIRE(spy.log() == AllocatorLog{
-                             Allocate(sizeofPool()),
-                             Allocate(sizeofString("world")),
-                         });
-  }
-
-  SECTION("should duplicate std::string") {
-    array.add("world"_s);
-    REQUIRE(spy.log() == AllocatorLog{
-                             Allocate(sizeofPool()),
-                             Allocate(sizeofString("world")),
-                         });
-  }
-
-  SECTION("should duplicate serialized(const char*)") {
-    array.add(serialized("{}"));
-    REQUIRE(spy.log() == AllocatorLog{
-                             Allocate(sizeofPool()),
-                             Allocate(sizeofString("{}")),
-                         });
-  }
-
-  SECTION("should duplicate serialized(char*)") {
-    array.add(serialized(const_cast<char*>("{}")));
-    REQUIRE(spy.log() == AllocatorLog{
-                             Allocate(sizeofPool()),
-                             Allocate(sizeofString("{}")),
-                         });
-  }
-
-  SECTION("should duplicate serialized(std::string)") {
-    array.add(serialized("{}"_s));
-    REQUIRE(spy.log() == AllocatorLog{
-                             Allocate(sizeofPool()),
-                             Allocate(sizeofString("{}")),
-                         });
-  }
-
-  SECTION("should duplicate serialized(std::string)") {
-    array.add(serialized("\0XX"_s));
-    REQUIRE(spy.log() == AllocatorLog{
-                             Allocate(sizeofPool()),
-                             Allocate(sizeofString(" XX")),
-                         });
-  }
 }
 
 TEST_CASE("JsonArray::add<T>()") {
diff --git a/lib/ArduinoJson/extras/tests/JsonArray/std_string.cpp b/lib/ArduinoJson/extras/tests/JsonArray/std_string.cpp
deleted file mode 100644
index d6cae2e6..00000000
--- a/lib/ArduinoJson/extras/tests/JsonArray/std_string.cpp
+++ /dev/null
@@ -1,34 +0,0 @@
-// ArduinoJson - https://arduinojson.org
-// Copyright © 2014-2024, Benoit BLANCHON
-// MIT License
-
-#include <ArduinoJson.h>
-#include <catch.hpp>
-
-#include "Literals.hpp"
-
-static void eraseString(std::string& str) {
-  char* p = const_cast<char*>(str.c_str());
-  while (*p)
-    *p++ = '*';
-}
-
-TEST_CASE("std::string") {
-  JsonDocument doc;
-  JsonArray array = doc.to<JsonArray>();
-
-  SECTION("add()") {
-    std::string value("hello");
-    array.add(value);
-    eraseString(value);
-    REQUIRE("hello"_s == array[0]);
-  }
-
-  SECTION("operator[]") {
-    std::string value("world");
-    array.add("hello");
-    array[0] = value;
-    eraseString(value);
-    REQUIRE("world"_s == array[0]);
-  }
-}
diff --git a/lib/ArduinoJson/extras/tests/JsonArray/subscript.cpp b/lib/ArduinoJson/extras/tests/JsonArray/subscript.cpp
index b0332f85..40b17361 100644
--- a/lib/ArduinoJson/extras/tests/JsonArray/subscript.cpp
+++ b/lib/ArduinoJson/extras/tests/JsonArray/subscript.cpp
@@ -59,14 +59,55 @@ TEST_CASE("JsonArray::operator[]") {
     REQUIRE(false == array[0].is<int>());
   }
 
+  SECTION("string literal") {
+    array[0] = "hello";
+
+    REQUIRE(array[0].as<std::string>() == "hello");
+    REQUIRE(true == array[0].is<const char*>());
+    REQUIRE(false == array[0].is<int>());
+    REQUIRE(spy.log() == AllocatorLog{
+                             Allocate(sizeofPool()),
+                             Allocate(sizeofString("world")),
+                         });
+  }
+
   SECTION("const char*") {
     const char* str = "hello";
-
     array[0] = str;
-    REQUIRE(str == array[0].as<const char*>());
+
+    REQUIRE(array[0].as<std::string>() == "hello");
+    REQUIRE(true == array[0].is<const char*>());
+    REQUIRE(false == array[0].is<int>());
+    REQUIRE(spy.log() == AllocatorLog{
+                             Allocate(sizeofPool()),
+                             Allocate(sizeofString("world")),
+                         });
+  }
+
+  SECTION("std::string") {
+    array[0] = "hello"_s;
+
+    REQUIRE(array[0].as<std::string>() == "hello");
     REQUIRE(true == array[0].is<const char*>());
     REQUIRE(false == array[0].is<int>());
+    REQUIRE(spy.log() == AllocatorLog{
+                             Allocate(sizeofPool()),
+                             Allocate(sizeofString("world")),
+                         });
+  }
+
+#ifdef HAS_VARIABLE_LENGTH_ARRAY
+  SECTION("VLA") {
+    size_t i = 16;
+    char vla[i];
+    strcpy(vla, "world");
+
+    array.add("hello");
+    array[0] = vla;
+
+    REQUIRE(array[0] == "world"_s);
   }
+#endif
 
   SECTION("nested array") {
     JsonDocument doc2;
@@ -114,58 +155,11 @@ TEST_CASE("JsonArray::operator[]") {
     REQUIRE(str == array[0]);
   }
 
-  SECTION("should not duplicate const char*") {
-    array[0] = "world";
-    REQUIRE(spy.log() == AllocatorLog{
-                             Allocate(sizeofPool()),
-                         });
-  }
-
-  SECTION("should duplicate char*") {
-    array[0] = const_cast<char*>("world");
-    REQUIRE(spy.log() == AllocatorLog{
-                             Allocate(sizeofPool()),
-                             Allocate(sizeofString("world")),
-                         });
-  }
-
-  SECTION("should duplicate std::string") {
-    array[0] = "world"_s;
-    REQUIRE(spy.log() == AllocatorLog{
-                             Allocate(sizeofPool()),
-                             Allocate(sizeofString("world")),
-                         });
-  }
-
   SECTION("array[0].to<JsonObject>()") {
     JsonObject obj = array[0].to<JsonObject>();
     REQUIRE(obj.isNull() == false);
   }
 
-#ifdef HAS_VARIABLE_LENGTH_ARRAY
-  SECTION("set(VLA)") {
-    size_t i = 16;
-    char vla[i];
-    strcpy(vla, "world");
-
-    array.add("hello");
-    array[0].set(vla);
-
-    REQUIRE("world"_s == array[0]);
-  }
-
-  SECTION("operator=(VLA)") {
-    size_t i = 16;
-    char vla[i];
-    strcpy(vla, "world");
-
-    array.add("hello");
-    array[0] = vla;
-
-    REQUIRE("world"_s == array[0]);
-  }
-#endif
-
   SECTION("Use a JsonVariant as index") {
     array[0] = 1;
     array[1] = 2;
diff --git a/lib/ArduinoJson/extras/tests/JsonDeserializer/filter.cpp b/lib/ArduinoJson/extras/tests/JsonDeserializer/filter.cpp
index 4dc2fc6d..894df750 100644
--- a/lib/ArduinoJson/extras/tests/JsonDeserializer/filter.cpp
+++ b/lib/ArduinoJson/extras/tests/JsonDeserializer/filter.cpp
@@ -693,6 +693,15 @@ TEST_CASE("Filtering") {
           "null",
           0,
       },
+      {
+          "NUL character in key",
+          "{\"x\":0,\"x\\u0000a\":1,\"x\\u0000b\":2}",
+          "{\"x\\u0000a\":true}",
+          10,
+          DeserializationError::Ok,
+          "{\"x\\u0000a\":1}",
+          sizeofObject(1) + sizeofString("x?a"),
+      },
   };
 
   for (auto& tc : testCases) {
diff --git a/lib/ArduinoJson/extras/tests/JsonDeserializer/object.cpp b/lib/ArduinoJson/extras/tests/JsonDeserializer/object.cpp
index ee62ae43..9f0aecb4 100644
--- a/lib/ArduinoJson/extras/tests/JsonDeserializer/object.cpp
+++ b/lib/ArduinoJson/extras/tests/JsonDeserializer/object.cpp
@@ -6,6 +6,7 @@
 #include <catch.hpp>
 
 #include "Allocators.hpp"
+#include "Literals.hpp"
 
 using ArduinoJson::detail::sizeofObject;
 
@@ -322,10 +323,11 @@ TEST_CASE("deserialize JSON object") {
 
     SECTION("NUL in keys") {
       DeserializationError err =
-          deserializeJson(doc, "{\"x\\u0000a\":1,\"x\\u0000b\":2}");
+          deserializeJson(doc, "{\"x\":0,\"x\\u0000a\":1,\"x\\u0000b\":2}");
 
       REQUIRE(err == DeserializationError::Ok);
-      REQUIRE(doc.as<std::string>() == "{\"x\\u0000a\":1,\"x\\u0000b\":2}");
+      REQUIRE(doc.as<std::string>() ==
+              "{\"x\":0,\"x\\u0000a\":1,\"x\\u0000b\":2}");
     }
   }
 
diff --git a/lib/ArduinoJson/extras/tests/JsonDocument/ElementProxy.cpp b/lib/ArduinoJson/extras/tests/JsonDocument/ElementProxy.cpp
index 7faf0e47..387dc884 100644
--- a/lib/ArduinoJson/extras/tests/JsonDocument/ElementProxy.cpp
+++ b/lib/ArduinoJson/extras/tests/JsonDocument/ElementProxy.cpp
@@ -5,37 +5,60 @@
 #include <ArduinoJson.h>
 #include <catch.hpp>
 
+#include "Allocators.hpp"
 #include "Literals.hpp"
 
 using ElementProxy = ArduinoJson::detail::ElementProxy<JsonDocument&>;
 
 TEST_CASE("ElementProxy::add()") {
-  JsonDocument doc;
+  SpyingAllocator spy;
+  JsonDocument doc(&spy);
   doc.add<JsonVariant>();
-  ElementProxy ep = doc[0];
+  const ElementProxy& ep = doc[0];
 
-  SECTION("add(int)") {
+  SECTION("integer") {
     ep.add(42);
 
     REQUIRE(doc.as<std::string>() == "[[42]]");
+    REQUIRE(spy.log() == AllocatorLog{
+                             Allocate(sizeofPool()),
+                         });
   }
 
-  SECTION("add(const char*)") {
+  SECTION("string literal") {
     ep.add("world");
 
     REQUIRE(doc.as<std::string>() == "[[\"world\"]]");
+    REQUIRE(spy.log() == AllocatorLog{
+                             Allocate(sizeofPool()),
+                         });
+  }
+
+  SECTION("const char*") {
+    const char* s = "world";
+    ep.add(s);
+
+    REQUIRE(doc.as<std::string>() == "[[\"world\"]]");
+    REQUIRE(spy.log() == AllocatorLog{
+                             Allocate(sizeofPool()),
+                             Allocate(sizeofString("world")),
+                         });
   }
 
-  SECTION("add(char[])") {
+  SECTION("char[]") {
     char s[] = "world";
     ep.add(s);
     strcpy(s, "!!!!!");
 
     REQUIRE(doc.as<std::string>() == "[[\"world\"]]");
+    REQUIRE(spy.log() == AllocatorLog{
+                             Allocate(sizeofPool()),
+                             Allocate(sizeofString("world")),
+                         });
   }
 
 #ifdef HAS_VARIABLE_LENGTH_ARRAY
-  SECTION("set(vla)") {
+  SECTION("VLA") {
     size_t i = 8;
     char vla[i];
     strcpy(vla, "world");
@@ -43,6 +66,10 @@ TEST_CASE("ElementProxy::add()") {
     ep.add(vla);
 
     REQUIRE(doc.as<std::string>() == "[[\"world\"]]");
+    REQUIRE(spy.log() == AllocatorLog{
+                             Allocate(sizeofPool()),
+                             Allocate(sizeofString("world")),
+                         });
   }
 #endif
 }
@@ -50,7 +77,7 @@ TEST_CASE("ElementProxy::add()") {
 TEST_CASE("ElementProxy::clear()") {
   JsonDocument doc;
   doc.add<JsonVariant>();
-  ElementProxy ep = doc[0];
+  const ElementProxy& ep = doc[0];
 
   SECTION("size goes back to zero") {
     ep.add(42);
@@ -110,7 +137,7 @@ TEST_CASE("ElementProxy::operator==()") {
 TEST_CASE("ElementProxy::remove()") {
   JsonDocument doc;
   doc.add<JsonVariant>();
-  ElementProxy ep = doc[0];
+  const ElementProxy& ep = doc[0];
 
   SECTION("remove(int)") {
     ep.add(1);
@@ -157,7 +184,7 @@ TEST_CASE("ElementProxy::remove()") {
 
 TEST_CASE("ElementProxy::set()") {
   JsonDocument doc;
-  ElementProxy ep = doc[0];
+  const ElementProxy& ep = doc[0];
 
   SECTION("set(int)") {
     ep.set(42);
@@ -195,7 +222,7 @@ TEST_CASE("ElementProxy::set()") {
 TEST_CASE("ElementProxy::size()") {
   JsonDocument doc;
   doc.add<JsonVariant>();
-  ElementProxy ep = doc[0];
+  const ElementProxy& ep = doc[0];
 
   SECTION("returns 0") {
     REQUIRE(ep.size() == 0);
@@ -216,7 +243,7 @@ TEST_CASE("ElementProxy::size()") {
 
 TEST_CASE("ElementProxy::operator[]") {
   JsonDocument doc;
-  ElementProxy ep = doc[1];
+  const ElementProxy& ep = doc[1];
 
   SECTION("set member") {
     ep["world"] = 42;
@@ -247,7 +274,7 @@ TEST_CASE("ElementProxy cast to JsonVariantConst") {
   JsonDocument doc;
   doc[0] = "world";
 
-  const ElementProxy ep = doc[0];
+  const ElementProxy& ep = doc[0];
 
   JsonVariantConst var = ep;
 
@@ -258,7 +285,7 @@ TEST_CASE("ElementProxy cast to JsonVariant") {
   JsonDocument doc;
   doc[0] = "world";
 
-  ElementProxy ep = doc[0];
+  const ElementProxy& ep = doc[0];
 
   JsonVariant var = ep;
 
diff --git a/lib/ArduinoJson/extras/tests/JsonDocument/MemberProxy.cpp b/lib/ArduinoJson/extras/tests/JsonDocument/MemberProxy.cpp
index d59b5813..4eb7468c 100644
--- a/lib/ArduinoJson/extras/tests/JsonDocument/MemberProxy.cpp
+++ b/lib/ArduinoJson/extras/tests/JsonDocument/MemberProxy.cpp
@@ -14,27 +14,54 @@
 using ArduinoJson::detail::sizeofArray;
 using ArduinoJson::detail::sizeofObject;
 
-using MemberProxy =
-    ArduinoJson::detail::MemberProxy<JsonDocument&, const char*>;
-
 TEST_CASE("MemberProxy::add()") {
-  JsonDocument doc;
-  MemberProxy mp = doc["hello"];
+  SpyingAllocator spy;
+  JsonDocument doc(&spy);
+  const auto& mp = doc["hello"];
 
-  SECTION("add(int)") {
+  SECTION("integer") {
     mp.add(42);
 
     REQUIRE(doc.as<std::string>() == "{\"hello\":[42]}");
+    REQUIRE(spy.log() == AllocatorLog{
+                             Allocate(sizeofPool()),
+                         });
   }
 
-  SECTION("add(const char*)") {
+  SECTION("string literal") {
     mp.add("world");
 
     REQUIRE(doc.as<std::string>() == "{\"hello\":[\"world\"]}");
+    REQUIRE(spy.log() == AllocatorLog{
+                             Allocate(sizeofPool()),
+                         });
+  }
+
+  SECTION("const char*") {
+    const char* temp = "world";
+    mp.add(temp);
+
+    REQUIRE(doc.as<std::string>() == "{\"hello\":[\"world\"]}");
+    REQUIRE(spy.log() == AllocatorLog{
+                             Allocate(sizeofPool()),
+                             Allocate(sizeofString("world")),
+                         });
+  }
+
+  SECTION("char[]") {
+    char temp[] = "world";
+    mp.add(temp);
+
+    REQUIRE(doc.as<std::string>() == "{\"hello\":[\"world\"]}");
+    REQUIRE(spy.log() == AllocatorLog{
+                             Allocate(sizeofPool()),
+                             Allocate(sizeofString("world")),
+
+                         });
   }
 
 #ifdef HAS_VARIABLE_LENGTH_ARRAY
-  SECTION("add(vla)") {
+  SECTION("VLA") {
     size_t i = 16;
     char vla[i];
     strcpy(vla, "world");
@@ -42,13 +69,17 @@ TEST_CASE("MemberProxy::add()") {
     mp.add(vla);
 
     REQUIRE(doc.as<std::string>() == "{\"hello\":[\"world\"]}");
+    REQUIRE(spy.log() == AllocatorLog{
+                             Allocate(sizeofPool()),
+                             Allocate(sizeofString("world")),
+                         });
   }
 #endif
 }
 
 TEST_CASE("MemberProxy::clear()") {
   JsonDocument doc;
-  MemberProxy mp = doc["hello"];
+  const auto& mp = doc["hello"];
 
   SECTION("size goes back to zero") {
     mp.add(42);
@@ -139,7 +170,7 @@ TEST_CASE("MemberProxy::operator|()") {
 
 TEST_CASE("MemberProxy::remove()") {
   JsonDocument doc;
-  MemberProxy mp = doc["hello"];
+  const auto& mp = doc["hello"];
 
   SECTION("remove(int)") {
     mp.add(1);
@@ -186,7 +217,7 @@ TEST_CASE("MemberProxy::remove()") {
 
 TEST_CASE("MemberProxy::set()") {
   JsonDocument doc;
-  MemberProxy mp = doc["hello"];
+  const auto& mp = doc["hello"];
 
   SECTION("set(int)") {
     mp.set(42);
@@ -223,7 +254,7 @@ TEST_CASE("MemberProxy::set()") {
 
 TEST_CASE("MemberProxy::size()") {
   JsonDocument doc;
-  MemberProxy mp = doc["hello"];
+  const auto& mp = doc["hello"];
 
   SECTION("returns 0") {
     REQUIRE(mp.size() == 0);
@@ -246,7 +277,7 @@ TEST_CASE("MemberProxy::size()") {
 
 TEST_CASE("MemberProxy::operator[]") {
   JsonDocument doc;
-  MemberProxy mp = doc["hello"];
+  const auto& mp = doc["hello"];
 
   SECTION("set member") {
     mp["world"] = 42;
@@ -265,7 +296,7 @@ TEST_CASE("MemberProxy cast to JsonVariantConst") {
   JsonDocument doc;
   doc["hello"] = "world";
 
-  const MemberProxy mp = doc["hello"];
+  const auto& mp = doc["hello"];
 
   JsonVariantConst var = mp;
 
@@ -276,7 +307,7 @@ TEST_CASE("MemberProxy cast to JsonVariant") {
   JsonDocument doc;
   doc["hello"] = "world";
 
-  MemberProxy mp = doc["hello"];
+  const auto& mp = doc["hello"];
 
   JsonVariant var = mp;
 
diff --git a/lib/ArduinoJson/extras/tests/JsonDocument/add.cpp b/lib/ArduinoJson/extras/tests/JsonDocument/add.cpp
index 31aa6c2f..8a1c48e3 100644
--- a/lib/ArduinoJson/extras/tests/JsonDocument/add.cpp
+++ b/lib/ArduinoJson/extras/tests/JsonDocument/add.cpp
@@ -26,7 +26,7 @@ TEST_CASE("JsonDocument::add(T)") {
                          });
   }
 
-  SECTION("const char*") {
+  SECTION("string literal") {
     doc.add("hello");
 
     REQUIRE(doc.as<std::string>() == "[\"hello\"]");
@@ -35,6 +35,17 @@ TEST_CASE("JsonDocument::add(T)") {
                          });
   }
 
+  SECTION("const char*") {
+    const char* value = "hello";
+    doc.add(value);
+
+    REQUIRE(doc.as<std::string>() == "[\"hello\"]");
+    REQUIRE(spy.log() == AllocatorLog{
+                             Allocate(sizeofPool()),
+                             Allocate(sizeofString("hello")),
+                         });
+  }
+
   SECTION("std::string") {
     doc.add("example"_s);
     doc.add("example"_s);
diff --git a/lib/ArduinoJson/extras/tests/JsonDocument/containsKey.cpp b/lib/ArduinoJson/extras/tests/JsonDocument/containsKey.cpp
deleted file mode 100644
index a68236e3..00000000
--- a/lib/ArduinoJson/extras/tests/JsonDocument/containsKey.cpp
+++ /dev/null
@@ -1,54 +0,0 @@
-// ArduinoJson - https://arduinojson.org
-// Copyright © 2014-2024, Benoit BLANCHON
-// MIT License
-
-#include <ArduinoJson.h>
-#include <catch.hpp>
-
-#include "Literals.hpp"
-
-TEST_CASE("JsonDocument::containsKey()") {
-  JsonDocument doc;
-
-  SECTION("returns true on object") {
-    doc["hello"] = "world";
-
-    REQUIRE(doc.containsKey("hello") == true);
-  }
-
-  SECTION("returns true when value is null") {
-    doc["hello"] = static_cast<const char*>(0);
-
-    REQUIRE(doc.containsKey("hello") == true);
-  }
-
-  SECTION("returns true when key is a std::string") {
-    doc["hello"] = "world";
-
-    REQUIRE(doc.containsKey("hello"_s) == true);
-  }
-
-  SECTION("returns false  on object") {
-    doc["world"] = "hello";
-
-    REQUIRE(doc.containsKey("hello") == false);
-  }
-
-  SECTION("returns false on array") {
-    doc.add("hello");
-
-    REQUIRE(doc.containsKey("hello") == false);
-  }
-
-  SECTION("returns false on null") {
-    REQUIRE(doc.containsKey("hello") == false);
-  }
-
-  SECTION("support JsonVariant") {
-    doc["hello"] = "world";
-    doc["key"] = "hello";
-
-    REQUIRE(doc.containsKey(doc["key"]) == true);
-    REQUIRE(doc.containsKey(doc["foo"]) == false);
-  }
-}
diff --git a/lib/ArduinoJson/extras/tests/JsonDocument/issue1120.cpp b/lib/ArduinoJson/extras/tests/JsonDocument/issue1120.cpp
index 07ad9324..aa3132f5 100644
--- a/lib/ArduinoJson/extras/tests/JsonDocument/issue1120.cpp
+++ b/lib/ArduinoJson/extras/tests/JsonDocument/issue1120.cpp
@@ -12,49 +12,41 @@ TEST_CASE("Issue #1120") {
 
   SECTION("MemberProxy<std::string>::isNull()") {
     SECTION("returns false") {
-      auto value = doc["contents"_s];
-      CHECK(value.isNull() == false);
+      CHECK(doc["contents"_s].isNull() == false);
     }
 
     SECTION("returns true") {
-      auto value = doc["zontents"_s];
-      CHECK(value.isNull() == true);
+      CHECK(doc["zontents"_s].isNull() == true);
     }
   }
 
   SECTION("ElementProxy<MemberProxy<const char*> >::isNull()") {
     SECTION("returns false") {  // Issue #1120
-      auto value = doc["contents"][1];
-      CHECK(value.isNull() == false);
+      CHECK(doc["contents"][1].isNull() == false);
     }
 
     SECTION("returns true") {
-      auto value = doc["contents"][2];
-      CHECK(value.isNull() == true);
+      CHECK(doc["contents"][2].isNull() == true);
     }
   }
 
   SECTION("MemberProxy<ElementProxy<MemberProxy>, const char*>::isNull()") {
     SECTION("returns false") {
-      auto value = doc["contents"][1]["module"];
-      CHECK(value.isNull() == false);
+      CHECK(doc["contents"][1]["module"].isNull() == false);
     }
 
     SECTION("returns true") {
-      auto value = doc["contents"][1]["zodule"];
-      CHECK(value.isNull() == true);
+      CHECK(doc["contents"][1]["zodule"].isNull() == true);
     }
   }
 
   SECTION("MemberProxy<ElementProxy<MemberProxy>, std::string>::isNull()") {
     SECTION("returns false") {
-      auto value = doc["contents"][1]["module"_s];
-      CHECK(value.isNull() == false);
+      CHECK(doc["contents"][1]["module"_s].isNull() == false);
     }
 
     SECTION("returns true") {
-      auto value = doc["contents"][1]["zodule"_s];
-      CHECK(value.isNull() == true);
+      CHECK(doc["contents"][1]["zodule"_s].isNull() == true);
     }
   }
 }
diff --git a/lib/ArduinoJson/extras/tests/JsonDocument/remove.cpp b/lib/ArduinoJson/extras/tests/JsonDocument/remove.cpp
index afabf4eb..1656a4d2 100644
--- a/lib/ArduinoJson/extras/tests/JsonDocument/remove.cpp
+++ b/lib/ArduinoJson/extras/tests/JsonDocument/remove.cpp
@@ -20,11 +20,21 @@ TEST_CASE("JsonDocument::remove()") {
     REQUIRE(doc.as<std::string>() == "[1,3]");
   }
 
+  SECTION("string literal") {
+    doc["a"] = 1;
+    doc["a\0b"_s] = 2;
+    doc["b"] = 3;
+
+    doc.remove("a\0b");
+
+    REQUIRE(doc.as<std::string>() == "{\"a\":1,\"b\":3}");
+  }
+
   SECTION("remove(const char *)") {
     doc["a"] = 1;
     doc["b"] = 2;
 
-    doc.remove("a");
+    doc.remove(static_cast<const char*>("a"));
 
     REQUIRE(doc.as<std::string>() == "{\"b\":2}");
   }
diff --git a/lib/ArduinoJson/extras/tests/JsonDocument/set.cpp b/lib/ArduinoJson/extras/tests/JsonDocument/set.cpp
index ce9de42a..1205acf5 100644
--- a/lib/ArduinoJson/extras/tests/JsonDocument/set.cpp
+++ b/lib/ArduinoJson/extras/tests/JsonDocument/set.cpp
@@ -11,6 +11,21 @@ TEST_CASE("JsonDocument::set()") {
   SpyingAllocator spy;
   JsonDocument doc(&spy);
 
+  SECTION("nullptr") {
+    doc.set(nullptr);
+
+    REQUIRE(doc.isNull());
+    REQUIRE(spy.log() == AllocatorLog{});
+  }
+
+  SECTION("integer&") {
+    int toto = 42;
+    doc.set(toto);
+
+    REQUIRE(doc.as<std::string>() == "42");
+    REQUIRE(spy.log() == AllocatorLog{});
+  }
+
   SECTION("integer") {
     doc.set(42);
 
@@ -18,13 +33,23 @@ TEST_CASE("JsonDocument::set()") {
     REQUIRE(spy.log() == AllocatorLog{});
   }
 
-  SECTION("const char*") {
+  SECTION("string literal") {
     doc.set("example");
 
     REQUIRE(doc.as<const char*>() == "example"_s);
     REQUIRE(spy.log() == AllocatorLog{});
   }
 
+  SECTION("const char*") {
+    const char* value = "example";
+    doc.set(value);
+
+    REQUIRE(doc.as<const char*>() == "example"_s);
+    REQUIRE(spy.log() == AllocatorLog{
+                             Allocate(sizeofString("example")),
+                         });
+  }
+
   SECTION("std::string") {
     doc.set("example"_s);
 
diff --git a/lib/ArduinoJson/extras/tests/JsonDocument/subscript.cpp b/lib/ArduinoJson/extras/tests/JsonDocument/subscript.cpp
index 250ce1dd..2150d15c 100644
--- a/lib/ArduinoJson/extras/tests/JsonDocument/subscript.cpp
+++ b/lib/ArduinoJson/extras/tests/JsonDocument/subscript.cpp
@@ -5,6 +5,7 @@
 #include <ArduinoJson.h>
 #include <catch.hpp>
 
+#include "Allocators.hpp"
 #include "Literals.hpp"
 
 TEST_CASE("JsonDocument::operator[]") {
@@ -16,8 +17,16 @@ TEST_CASE("JsonDocument::operator[]") {
     doc["abc\0d"_s] = "ABCD";
 
     SECTION("const char*") {
+      const char* key = "abc";
+      REQUIRE(doc[key] == "ABC");
+      REQUIRE(cdoc[key] == "ABC");
+    }
+
+    SECTION("string literal") {
       REQUIRE(doc["abc"] == "ABC");
       REQUIRE(cdoc["abc"] == "ABC");
+      REQUIRE(doc["abc\0d"] == "ABCD");
+      REQUIRE(cdoc["abc\0d"] == "ABCD");
     }
 
     SECTION("std::string") {
@@ -94,3 +103,65 @@ TEST_CASE("JsonDocument automatically promotes to array") {
 
   REQUIRE(doc.as<std::string>() == "[null,null,2]");
 }
+
+TEST_CASE("JsonDocument::operator[] key storage") {
+  SpyingAllocator spy;
+  JsonDocument doc(&spy);
+
+  SECTION("string literal") {
+    doc["hello"] = 0;
+
+    REQUIRE(doc.as<std::string>() == "{\"hello\":0}");
+    REQUIRE(spy.log() == AllocatorLog{
+                             Allocate(sizeofPool()),
+                         });
+  }
+
+  SECTION("const char*") {
+    const char* key = "hello";
+    doc[key] = 0;
+
+    REQUIRE(doc.as<std::string>() == "{\"hello\":0}");
+    REQUIRE(spy.log() == AllocatorLog{
+                             Allocate(sizeofPool()),
+                             Allocate(sizeofString("hello")),
+                         });
+  }
+
+  SECTION("char[]") {
+    char key[] = "hello";
+    doc[key] = 0;
+
+    REQUIRE(doc.as<std::string>() == "{\"hello\":0}");
+    REQUIRE(spy.log() == AllocatorLog{
+                             Allocate(sizeofPool()),
+                             Allocate(sizeofString("hello")),
+                         });
+  }
+
+  SECTION("std::string") {
+    doc["hello"_s] = 0;
+
+    REQUIRE(doc.as<std::string>() == "{\"hello\":0}");
+    REQUIRE(spy.log() == AllocatorLog{
+                             Allocate(sizeofPool()),
+                             Allocate(sizeofString("hello")),
+                         });
+  }
+#if defined(HAS_VARIABLE_LENGTH_ARRAY) && \
+    !defined(SUBSCRIPT_CONFLICTS_WITH_BUILTIN_OPERATOR)
+  SECTION("VLA") {
+    size_t i = 16;
+    char vla[i];
+    strcpy(vla, "hello");
+
+    doc[vla] = 0;
+
+    REQUIRE(doc.as<std::string>() == "{\"hello\":0}");
+    REQUIRE(spy.log() == AllocatorLog{
+                             Allocate(sizeofPool()),
+                             Allocate(sizeofString("hello")),
+                         });
+  }
+#endif
+}
diff --git a/lib/ArduinoJson/extras/tests/JsonObject/containsKey.cpp b/lib/ArduinoJson/extras/tests/JsonObject/containsKey.cpp
deleted file mode 100644
index d7dd8d1e..00000000
--- a/lib/ArduinoJson/extras/tests/JsonObject/containsKey.cpp
+++ /dev/null
@@ -1,39 +0,0 @@
-// ArduinoJson - https://arduinojson.org
-// Copyright © 2014-2024, Benoit BLANCHON
-// MIT License
-
-#include <ArduinoJson.h>
-#include <catch.hpp>
-
-TEST_CASE("JsonObject::containsKey()") {
-  JsonDocument doc;
-  JsonObject obj = doc.to<JsonObject>();
-  obj["hello"] = 42;
-
-  SECTION("returns true only if key is present") {
-    REQUIRE(false == obj.containsKey("world"));
-    REQUIRE(true == obj.containsKey("hello"));
-  }
-
-  SECTION("returns false after remove()") {
-    obj.remove("hello");
-
-    REQUIRE(false == obj.containsKey("hello"));
-  }
-
-#ifdef HAS_VARIABLE_LENGTH_ARRAY
-  SECTION("key is a VLA") {
-    size_t i = 16;
-    char vla[i];
-    strcpy(vla, "hello");
-
-    REQUIRE(true == obj.containsKey(vla));
-  }
-#endif
-
-  SECTION("key is a JsonVariant") {
-    doc["key"] = "hello";
-    REQUIRE(true == obj.containsKey(obj["key"]));
-    REQUIRE(false == obj.containsKey(obj["hello"]));
-  }
-}
diff --git a/lib/ArduinoJson/extras/tests/JsonObject/subscript.cpp b/lib/ArduinoJson/extras/tests/JsonObject/subscript.cpp
index 23512a02..0acc01e5 100644
--- a/lib/ArduinoJson/extras/tests/JsonObject/subscript.cpp
+++ b/lib/ArduinoJson/extras/tests/JsonObject/subscript.cpp
@@ -158,7 +158,7 @@ TEST_CASE("JsonObject::operator[]") {
   }
 
   SECTION("should duplicate a non-static JsonString key") {
-    obj[JsonString("hello", JsonString::Copied)] = "world";
+    obj[JsonString("hello", false)] = "world";
     REQUIRE(spy.log() == AllocatorLog{
                              Allocate(sizeofPool()),
                              Allocate(sizeofString("hello")),
@@ -166,7 +166,7 @@ TEST_CASE("JsonObject::operator[]") {
   }
 
   SECTION("should not duplicate a static JsonString key") {
-    obj[JsonString("hello", JsonString::Linked)] = "world";
+    obj[JsonString("hello", true)] = "world";
     REQUIRE(spy.log() == AllocatorLog{
                              Allocate(sizeofPool()),
                          });
diff --git a/lib/ArduinoJson/extras/tests/JsonObjectConst/containsKey.cpp b/lib/ArduinoJson/extras/tests/JsonObjectConst/containsKey.cpp
deleted file mode 100644
index 3283c08d..00000000
--- a/lib/ArduinoJson/extras/tests/JsonObjectConst/containsKey.cpp
+++ /dev/null
@@ -1,40 +0,0 @@
-// ArduinoJson - https://arduinojson.org
-// Copyright © 2014-2024, Benoit BLANCHON
-// MIT License
-
-#include <ArduinoJson.h>
-#include <catch.hpp>
-
-#include "Literals.hpp"
-
-TEST_CASE("JsonObjectConst::containsKey()") {
-  JsonDocument doc;
-  doc["hello"] = 42;
-  auto obj = doc.as<JsonObjectConst>();
-
-  SECTION("supports const char*") {
-    REQUIRE(false == obj.containsKey("world"));
-    REQUIRE(true == obj.containsKey("hello"));
-  }
-
-  SECTION("supports std::string") {
-    REQUIRE(false == obj.containsKey("world"_s));
-    REQUIRE(true == obj.containsKey("hello"_s));
-  }
-
-#ifdef HAS_VARIABLE_LENGTH_ARRAY
-  SECTION("supports VLA") {
-    size_t i = 16;
-    char vla[i];
-    strcpy(vla, "hello");
-
-    REQUIRE(true == obj.containsKey(vla));
-  }
-#endif
-
-  SECTION("supports JsonVariant") {
-    doc["key"] = "hello";
-    REQUIRE(true == obj.containsKey(obj["key"]));
-    REQUIRE(false == obj.containsKey(obj["hello"]));
-  }
-}
diff --git a/lib/ArduinoJson/extras/tests/JsonVariant/as.cpp b/lib/ArduinoJson/extras/tests/JsonVariant/as.cpp
index 2c6f54b1..bfdea044 100644
--- a/lib/ArduinoJson/extras/tests/JsonVariant/as.cpp
+++ b/lib/ArduinoJson/extras/tests/JsonVariant/as.cpp
@@ -184,7 +184,7 @@ TEST_CASE("JsonVariant::as()") {
 
     REQUIRE(variant.as<long>() == 42L);
     REQUIRE(variant.as<JsonString>() == "42");
-    REQUIRE(variant.as<JsonString>().isLinked() == true);
+    REQUIRE(variant.as<JsonString>().isStatic() == true);
   }
 
   SECTION("set(\"hello\")") {
@@ -207,7 +207,7 @@ TEST_CASE("JsonVariant::as()") {
     REQUIRE(variant.as<const char*>() == "4.2"_s);
     REQUIRE(variant.as<std::string>() == "4.2"_s);
     REQUIRE(variant.as<JsonString>() == "4.2");
-    REQUIRE(variant.as<JsonString>().isLinked() == false);
+    REQUIRE(variant.as<JsonString>().isStatic() == false);
   }
 
   SECTION("set(\"true\")") {
diff --git a/lib/ArduinoJson/extras/tests/JsonVariant/containsKey.cpp b/lib/ArduinoJson/extras/tests/JsonVariant/containsKey.cpp
deleted file mode 100644
index a406fe14..00000000
--- a/lib/ArduinoJson/extras/tests/JsonVariant/containsKey.cpp
+++ /dev/null
@@ -1,36 +0,0 @@
-// ArduinoJson - https://arduinojson.org
-// Copyright © 2014-2024, Benoit BLANCHON
-// MIT License
-
-#include <ArduinoJson.h>
-#include <stdint.h>
-#include <catch.hpp>
-
-#include "Literals.hpp"
-
-TEST_CASE("JsonVariant::containsKey()") {
-  JsonDocument doc;
-  JsonVariant var = doc.to<JsonVariant>();
-
-  SECTION("containsKey(const char*)") {
-    var["hello"] = "world";
-
-    REQUIRE(var.containsKey("hello") == true);
-    REQUIRE(var.containsKey("world") == false);
-  }
-
-  SECTION("containsKey(std::string)") {
-    var["hello"] = "world";
-
-    REQUIRE(var.containsKey("hello"_s) == true);
-    REQUIRE(var.containsKey("world"_s) == false);
-  }
-
-  SECTION("containsKey(JsonVariant)") {
-    var["hello"] = "world";
-    var["key"] = "hello";
-
-    REQUIRE(var.containsKey(doc["key"]) == true);
-    REQUIRE(var.containsKey(doc["foo"]) == false);
-  }
-}
diff --git a/lib/ArduinoJson/extras/tests/JsonVariant/set.cpp b/lib/ArduinoJson/extras/tests/JsonVariant/set.cpp
index b10f9505..b71c0016 100644
--- a/lib/ArduinoJson/extras/tests/JsonVariant/set.cpp
+++ b/lib/ArduinoJson/extras/tests/JsonVariant/set.cpp
@@ -17,6 +17,15 @@ TEST_CASE("JsonVariant::set() when there is enough memory") {
   JsonDocument doc(&spy);
   JsonVariant variant = doc.to<JsonVariant>();
 
+  SECTION("string literal") {
+    bool result = variant.set("hello\0world");
+
+    REQUIRE(result == true);
+    CHECK(variant ==
+          "hello"_s);  // linked string cannot contain '\0' at the moment
+    CHECK(spy.log() == AllocatorLog{});
+  }
+
   SECTION("const char*") {
     char str[16];
 
@@ -25,8 +34,10 @@ TEST_CASE("JsonVariant::set() when there is enough memory") {
     strcpy(str, "world");
 
     REQUIRE(result == true);
-    REQUIRE(variant == "world");  // stores by pointer
-    REQUIRE(spy.log() == AllocatorLog{});
+    REQUIRE(variant == "hello");  // stores by copy
+    REQUIRE(spy.log() == AllocatorLog{
+                             Allocate(sizeofString("hello")),
+                         });
   }
 
   SECTION("(const char*)0") {
@@ -34,6 +45,7 @@ TEST_CASE("JsonVariant::set() when there is enough memory") {
 
     REQUIRE(result == true);
     REQUIRE(variant.isNull());
+    REQUIRE(variant.as<const char*>() == nullptr);
     REQUIRE(spy.log() == AllocatorLog{});
   }
 
@@ -105,16 +117,14 @@ TEST_CASE("JsonVariant::set() when there is enough memory") {
 #endif
 
   SECTION("std::string") {
-    std::string str;
-
-    str = "hello";
+    std::string str = "hello\0world"_s;
     bool result = variant.set(str);
     str.replace(0, 5, "world");
 
     REQUIRE(result == true);
-    REQUIRE(variant == "hello");  // stores by copy
+    REQUIRE(variant == "hello\0world"_s);  // stores by copy
     REQUIRE(spy.log() == AllocatorLog{
-                             Allocate(sizeofString("hello")),
+                             Allocate(sizeofString("hello?world")),
                          });
   }
 
@@ -122,7 +132,7 @@ TEST_CASE("JsonVariant::set() when there is enough memory") {
     char str[16];
 
     strcpy(str, "hello");
-    bool result = variant.set(JsonString(str, JsonString::Linked));
+    bool result = variant.set(JsonString(str, true));
     strcpy(str, "world");
 
     REQUIRE(result == true);
@@ -134,7 +144,7 @@ TEST_CASE("JsonVariant::set() when there is enough memory") {
     char str[16];
 
     strcpy(str, "hello");
-    bool result = variant.set(JsonString(str, JsonString::Copied));
+    bool result = variant.set(JsonString(str));
     strcpy(str, "world");
 
     REQUIRE(result == true);
diff --git a/lib/ArduinoJson/extras/tests/JsonVariant/types.cpp b/lib/ArduinoJson/extras/tests/JsonVariant/types.cpp
index eb0ee628..b04c91f1 100644
--- a/lib/ArduinoJson/extras/tests/JsonVariant/types.cpp
+++ b/lib/ArduinoJson/extras/tests/JsonVariant/types.cpp
@@ -7,14 +7,8 @@
 #include <catch.hpp>
 #include <limits>
 
-template <typename T>
-void checkValue(T expected) {
-  JsonDocument doc;
-  JsonVariant variant = doc.to<JsonVariant>();
-
-  variant.set(expected);
-  REQUIRE(expected == variant.as<T>());
-}
+#include "Allocators.hpp"
+#include "Literals.hpp"
 
 template <typename T>
 void checkReference(T& expected) {
@@ -39,27 +33,29 @@ void checkNumericType() {
 }
 
 TEST_CASE("JsonVariant set()/get()") {
+  SpyingAllocator spy;
+  JsonDocument doc(&spy);
+  JsonVariant variant = doc.to<JsonVariant>();
+
 #if ARDUINOJSON_USE_LONG_LONG
   SECTION("SizeOfJsonInteger") {
     REQUIRE(8 == sizeof(JsonInteger));
   }
 #endif
 
-  SECTION("Null") {
-    checkValue<const char*>(NULL);
-  }
-  SECTION("const char*") {
-    checkValue<const char*>("hello");
-  }
-  SECTION("std::string") {
-    checkValue<std::string>("hello");
-  }
+  // /!\ Most test were moved to `JsonVariant/set.cpp`
+  // TODO: move the remaining tests too
 
   SECTION("False") {
-    checkValue<bool>(false);
+    variant.set(false);
+    REQUIRE(variant.as<bool>() == false);
+    REQUIRE(spy.log() == AllocatorLog{});
   }
+
   SECTION("True") {
-    checkValue<bool>(true);
+    variant.set(true);
+    REQUIRE(variant.as<bool>() == true);
+    REQUIRE(spy.log() == AllocatorLog{});
   }
 
   SECTION("Double") {
@@ -129,10 +125,12 @@ TEST_CASE("JsonVariant set()/get()") {
 #endif
 
   SECTION("CanStoreObject") {
-    JsonDocument doc;
-    JsonObject object = doc.to<JsonObject>();
+    JsonDocument doc2;
+    JsonObject object = doc2.to<JsonObject>();
 
-    checkValue<JsonObject>(object);
+    variant.set(object);
+    REQUIRE(variant.is<JsonObject>());
+    REQUIRE(variant.as<JsonObject>() == object);
   }
 }
 
diff --git a/lib/ArduinoJson/extras/tests/JsonVariantConst/containsKey.cpp b/lib/ArduinoJson/extras/tests/JsonVariantConst/containsKey.cpp
deleted file mode 100644
index dfa1fc80..00000000
--- a/lib/ArduinoJson/extras/tests/JsonVariantConst/containsKey.cpp
+++ /dev/null
@@ -1,41 +0,0 @@
-// ArduinoJson - https://arduinojson.org
-// Copyright © 2014-2024, Benoit BLANCHON
-// MIT License
-
-#include <ArduinoJson.h>
-#include <stdint.h>
-#include <catch.hpp>
-
-#include "Literals.hpp"
-
-TEST_CASE("JsonVariantConst::containsKey()") {
-  JsonDocument doc;
-  doc["hello"] = "world";
-  JsonVariantConst var = doc.as<JsonVariant>();
-
-  SECTION("support const char*") {
-    REQUIRE(var.containsKey("hello") == true);
-    REQUIRE(var.containsKey("world") == false);
-  }
-
-  SECTION("support std::string") {
-    REQUIRE(var.containsKey("hello"_s) == true);
-    REQUIRE(var.containsKey("world"_s) == false);
-  }
-
-#ifdef HAS_VARIABLE_LENGTH_ARRAY
-  SECTION("supports VLA") {
-    size_t i = 16;
-    char vla[i];
-    strcpy(vla, "hello");
-
-    REQUIRE(true == var.containsKey(vla));
-  }
-#endif
-
-  SECTION("support JsonVariant") {
-    doc["key"] = "hello";
-    REQUIRE(var.containsKey(var["key"]) == true);
-    REQUIRE(var.containsKey(var["foo"]) == false);
-  }
-}
diff --git a/lib/ArduinoJson/extras/tests/JsonVariantConst/subscript.cpp b/lib/ArduinoJson/extras/tests/JsonVariantConst/subscript.cpp
index 735506ae..a207c531 100644
--- a/lib/ArduinoJson/extras/tests/JsonVariantConst/subscript.cpp
+++ b/lib/ArduinoJson/extras/tests/JsonVariantConst/subscript.cpp
@@ -54,13 +54,22 @@ TEST_CASE("JsonVariantConst::operator[]") {
     object["abc"_s] = "ABC";
     object["abc\0d"_s] = "ABCD";
 
-    SECTION("supports const char*") {
+    SECTION("string literal") {
       REQUIRE(var["ab"] == "AB"_s);
       REQUIRE(var["abc"] == "ABC"_s);
+      REQUIRE(var["abc\0d"] == "ABCD"_s);
       REQUIRE(var["def"].isNull());
       REQUIRE(var[0].isNull());
     }
 
+    SECTION("const char*") {
+      REQUIRE(var[static_cast<const char*>("ab")] == "AB"_s);
+      REQUIRE(var[static_cast<const char*>("abc")] == "ABC"_s);
+      REQUIRE(var[static_cast<const char*>("abc\0d")] == "ABC"_s);
+      REQUIRE(var[static_cast<const char*>("def")].isNull());
+      REQUIRE(var[static_cast<const char*>(0)].isNull());
+    }
+
     SECTION("supports std::string") {
       REQUIRE(var["ab"_s] == "AB"_s);
       REQUIRE(var["abc"_s] == "ABC"_s);
diff --git a/lib/ArduinoJson/extras/tests/Misc/FloatParts.cpp b/lib/ArduinoJson/extras/tests/Misc/FloatParts.cpp
deleted file mode 100644
index e75a88db..00000000
--- a/lib/ArduinoJson/extras/tests/Misc/FloatParts.cpp
+++ /dev/null
@@ -1,44 +0,0 @@
-// ArduinoJson - https://arduinojson.org
-// Copyright © 2014-2024, Benoit BLANCHON
-// MIT License
-
-#include <ArduinoJson/Numbers/FloatParts.hpp>
-#include <catch.hpp>
-
-using namespace ArduinoJson::detail;
-
-TEST_CASE("FloatParts<double>") {
-  SECTION("1.7976931348623157E+308") {
-    FloatParts<double> parts(1.7976931348623157E+308);
-    REQUIRE(parts.integral == 1);
-    REQUIRE(parts.decimal == 797693135);
-    REQUIRE(parts.decimalPlaces == 9);
-    REQUIRE(parts.exponent == 308);
-  }
-
-  SECTION("4.94065645841247e-324") {
-    FloatParts<double> parts(4.94065645841247e-324);
-    REQUIRE(parts.integral == 4);
-    REQUIRE(parts.decimal == 940656458);
-    REQUIRE(parts.decimalPlaces == 9);
-    REQUIRE(parts.exponent == -324);
-  }
-}
-
-TEST_CASE("FloatParts<float>") {
-  SECTION("3.4E+38") {
-    FloatParts<float> parts(3.4E+38f);
-    REQUIRE(parts.integral == 3);
-    REQUIRE(parts.decimal == 4);
-    REQUIRE(parts.decimalPlaces == 1);
-    REQUIRE(parts.exponent == 38);
-  }
-
-  SECTION("1.17549435e−38") {
-    FloatParts<float> parts(1.17549435e-38f);
-    REQUIRE(parts.integral == 1);
-    REQUIRE(parts.decimal == 175494);
-    REQUIRE(parts.decimalPlaces == 6);
-    REQUIRE(parts.exponent == -38);
-  }
-}
diff --git a/lib/ArduinoJson/extras/tests/Misc/JsonString.cpp b/lib/ArduinoJson/extras/tests/Misc/JsonString.cpp
index 6b9ac5e1..3a33677f 100644
--- a/lib/ArduinoJson/extras/tests/Misc/JsonString.cpp
+++ b/lib/ArduinoJson/extras/tests/Misc/JsonString.cpp
@@ -13,7 +13,7 @@ TEST_CASE("JsonString") {
 
     CHECK(s.isNull() == true);
     CHECK(s.c_str() == 0);
-    CHECK(s.isLinked() == true);
+    CHECK(s.isStatic() == true);
     CHECK(s == JsonString());
     CHECK(s != "");
   }
@@ -96,7 +96,7 @@ TEST_CASE("JsonString") {
     JsonString s("hello world", 5);
 
     CHECK(s.size() == 5);
-    CHECK(s.isLinked() == true);
+    CHECK(s.isStatic() == false);
     CHECK(s == "hello");
     CHECK(s != "hello world");
   }
diff --git a/lib/ArduinoJson/extras/tests/Misc/StringAdapters.cpp b/lib/ArduinoJson/extras/tests/Misc/StringAdapters.cpp
index b33ab990..71e458bc 100644
--- a/lib/ArduinoJson/extras/tests/Misc/StringAdapters.cpp
+++ b/lib/ArduinoJson/extras/tests/Misc/StringAdapters.cpp
@@ -5,6 +5,7 @@
 #include <Arduino.h>
 
 #include <ArduinoJson/Strings/IsString.hpp>
+#include <ArduinoJson/Strings/JsonString.hpp>
 #include <ArduinoJson/Strings/StringAdapters.hpp>
 
 #include <catch.hpp>
@@ -16,27 +17,36 @@ using ArduinoJson::JsonString;
 using namespace ArduinoJson::detail;
 
 TEST_CASE("adaptString()") {
+  SECTION("string literal") {
+    auto s = adaptString("bravo\0alpha");
+
+    CHECK(s.isNull() == false);
+    CHECK(s.size() == 11);
+    CHECK(s.isStatic() == true);
+  }
+
   SECTION("null const char*") {
     auto s = adaptString(static_cast<const char*>(0));
 
     CHECK(s.isNull() == true);
     CHECK(s.size() == 0);
-    CHECK(s.isLinked() == true);
   }
 
   SECTION("non-null const char*") {
-    auto s = adaptString("bravo");
+    const char* p = "bravo";
+    auto s = adaptString(p);
 
     CHECK(s.isNull() == false);
     CHECK(s.size() == 5);
-    CHECK(s.isLinked() == true);
+    CHECK(s.isStatic() == false);
+    CHECK(s.data() == p);
   }
 
   SECTION("null const char* + size") {
     auto s = adaptString(static_cast<const char*>(0), 10);
 
     CHECK(s.isNull() == true);
-    CHECK(s.isLinked() == false);
+    CHECK(s.isStatic() == false);
   }
 
   SECTION("non-null const char* + size") {
@@ -44,7 +54,7 @@ TEST_CASE("adaptString()") {
 
     CHECK(s.isNull() == false);
     CHECK(s.size() == 5);
-    CHECK(s.isLinked() == false);
+    CHECK(s.isStatic() == false);
   }
 
   SECTION("null Flash string") {
@@ -52,7 +62,7 @@ TEST_CASE("adaptString()") {
 
     CHECK(s.isNull() == true);
     CHECK(s.size() == 0);
-    CHECK(s.isLinked() == false);
+    CHECK(s.isStatic() == false);
   }
 
   SECTION("non-null Flash string") {
@@ -60,7 +70,7 @@ TEST_CASE("adaptString()") {
 
     CHECK(s.isNull() == false);
     CHECK(s.size() == 5);
-    CHECK(s.isLinked() == false);
+    CHECK(s.isStatic() == false);
   }
 
   SECTION("std::string") {
@@ -69,7 +79,7 @@ TEST_CASE("adaptString()") {
 
     CHECK(s.isNull() == false);
     CHECK(s.size() == 5);
-    CHECK(s.isLinked() == false);
+    CHECK(s.isStatic() == false);
   }
 
   SECTION("Arduino String") {
@@ -78,7 +88,7 @@ TEST_CASE("adaptString()") {
 
     CHECK(s.isNull() == false);
     CHECK(s.size() == 5);
-    CHECK(s.isLinked() == false);
+    CHECK(s.isStatic() == false);
   }
 
   SECTION("custom_string") {
@@ -87,25 +97,25 @@ TEST_CASE("adaptString()") {
 
     CHECK(s.isNull() == false);
     CHECK(s.size() == 5);
-    CHECK(s.isLinked() == false);
+    CHECK(s.isStatic() == false);
   }
 
   SECTION("JsonString linked") {
-    JsonString orig("hello", JsonString::Ownership::Linked);
+    JsonString orig("hello", true);
     auto s = adaptString(orig);
 
     CHECK(s.isNull() == false);
     CHECK(s.size() == 5);
-    CHECK(s.isLinked() == true);
+    CHECK(s.isStatic() == true);
   }
 
   SECTION("JsonString copied") {
-    JsonString orig("hello", JsonString::Ownership::Copied);
+    JsonString orig("hello", false);
     auto s = adaptString(orig);
 
     CHECK(s.isNull() == false);
     CHECK(s.size() == 5);
-    CHECK(s.isLinked() == false);
+    CHECK(s.isStatic() == false);
   }
 }
 
diff --git a/lib/ArduinoJson/extras/tests/Misc/TypeTraits.cpp b/lib/ArduinoJson/extras/tests/Misc/TypeTraits.cpp
index 7beb4658..5d081061 100644
--- a/lib/ArduinoJson/extras/tests/Misc/TypeTraits.cpp
+++ b/lib/ArduinoJson/extras/tests/Misc/TypeTraits.cpp
@@ -211,6 +211,23 @@ TEST_CASE("Polyfills/type_traits") {
     CHECK(is_enum<bool>::value == false);
     CHECK(is_enum<double>::value == false);
   }
+
+  SECTION("remove_cv") {
+    CHECK(is_same<remove_cv_t<const int>, int>::value);
+    CHECK(is_same<remove_cv_t<volatile int>, int>::value);
+    CHECK(is_same<remove_cv_t<const volatile int>, int>::value);
+    CHECK(is_same<remove_cv_t<int>, int>::value);
+    CHECK(is_same<remove_cv_t<decltype("toto")>, decltype("toto")>::value);
+  }
+
+  SECTION("decay") {
+    CHECK(is_same<decay_t<int>, int>::value);
+    CHECK(is_same<decay_t<int&>, int>::value);
+    CHECK(is_same<decay_t<int&&>, int>::value);
+    CHECK(is_same<decay_t<int[]>, int*>::value);
+    CHECK(is_same<decay_t<int[10]>, int*>::value);
+    CHECK(is_same<decay_t<decltype("toto")>, const char*>::value);
+  }
 }
 
 TEST_CASE("is_std_string") {
diff --git a/lib/ArduinoJson/extras/tests/MsgPackSerializer/serializeVariant.cpp b/lib/ArduinoJson/extras/tests/MsgPackSerializer/serializeVariant.cpp
index 43ca3ff4..505b56ce 100644
--- a/lib/ArduinoJson/extras/tests/MsgPackSerializer/serializeVariant.cpp
+++ b/lib/ArduinoJson/extras/tests/MsgPackSerializer/serializeVariant.cpp
@@ -139,7 +139,8 @@ TEST_CASE("serialize MsgPack value") {
 
   SECTION("str 32") {
     std::string shortest(65536, '?');
-    checkVariant(shortest.c_str(), "\xDB\x00\x01\x00\x00"_s + shortest);
+    checkVariant(JsonString(shortest.c_str(), true),  // force store by pointer
+                 "\xDB\x00\x01\x00\x00"_s + shortest);
   }
 
   SECTION("serialized(const char*)") {
diff --git a/lib/ArduinoJson/idf_component.yml b/lib/ArduinoJson/idf_component.yml
index 4a65119b..70641db9 100644
--- a/lib/ArduinoJson/idf_component.yml
+++ b/lib/ArduinoJson/idf_component.yml
@@ -1,7 +1,7 @@
-version: "7.2.1"
+version: "7.3.0"
 description: >-
   A simple and efficient JSON library for embedded C++.
-  ★ 6739 stars on GitHub!
+  ★ 6785 stars on GitHub!
   Supports serialization, deserialization, MessagePack, streams, filtering, and more.
   Fully tested and documented.
 url: https://arduinojson.org/
diff --git a/lib/ArduinoJson/library.json b/lib/ArduinoJson/library.json
index 4c61b310..ba5d224c 100644
--- a/lib/ArduinoJson/library.json
+++ b/lib/ArduinoJson/library.json
@@ -1,13 +1,13 @@
 {
   "name": "ArduinoJson",
   "keywords": "json, rest, http, web",
-  "description": "A simple and efficient JSON library for embedded C++. ⭐ 6739 stars on GitHub! Supports serialization, deserialization, MessagePack, streams, filtering, and more. Fully tested and documented.",
+  "description": "A simple and efficient JSON library for embedded C++. ⭐ 6785 stars on GitHub! Supports serialization, deserialization, MessagePack, streams, filtering, and more. Fully tested and documented.",
   "homepage": "https://arduinojson.org/?utm_source=meta&utm_medium=library.json",
   "repository": {
     "type": "git",
     "url": "https://github.com/bblanchon/ArduinoJson.git"
   },
-  "version": "7.2.1",
+  "version": "7.3.0",
   "authors": {
     "name": "Benoit Blanchon",
     "url": "https://blog.benoitblanchon.fr"
diff --git a/lib/ArduinoJson/library.properties b/lib/ArduinoJson/library.properties
index c3ea5c35..6a153c08 100644
--- a/lib/ArduinoJson/library.properties
+++ b/lib/ArduinoJson/library.properties
@@ -1,9 +1,9 @@
 name=ArduinoJson
-version=7.2.1
+version=7.3.0
 author=Benoit Blanchon <blog.benoitblanchon.fr>
 maintainer=Benoit Blanchon <blog.benoitblanchon.fr>
 sentence=A simple and efficient JSON library for embedded C++.
-paragraph=⭐ 6739 stars on GitHub! Supports serialization, deserialization, MessagePack, streams, filtering, and more. Fully tested and documented.
+paragraph=⭐ 6785 stars on GitHub! Supports serialization, deserialization, MessagePack, streams, filtering, and more. Fully tested and documented.
 category=Data Processing
 url=https://arduinojson.org/?utm_source=meta&utm_medium=library.properties
 architectures=*
diff --git a/lib/ArduinoJson/src/ArduinoJson/Array/ArrayData.hpp b/lib/ArduinoJson/src/ArduinoJson/Array/ArrayData.hpp
index c2ae1fb3..f0f3175d 100644
--- a/lib/ArduinoJson/src/ArduinoJson/Array/ArrayData.hpp
+++ b/lib/ArduinoJson/src/ArduinoJson/Array/ArrayData.hpp
@@ -19,10 +19,10 @@ class ArrayData : public CollectionData {
   }
 
   template <typename T>
-  bool addValue(T&& value, ResourceManager* resources);
+  bool addValue(const T& value, ResourceManager* resources);
 
   template <typename T>
-  static bool addValue(ArrayData* array, T&& value,
+  static bool addValue(ArrayData* array, const T& value,
                        ResourceManager* resources) {
     if (!array)
       return false;
diff --git a/lib/ArduinoJson/src/ArduinoJson/Array/ArrayImpl.hpp b/lib/ArduinoJson/src/ArduinoJson/Array/ArrayImpl.hpp
index 9599a5eb..de261930 100644
--- a/lib/ArduinoJson/src/ArduinoJson/Array/ArrayImpl.hpp
+++ b/lib/ArduinoJson/src/ArduinoJson/Array/ArrayImpl.hpp
@@ -57,13 +57,13 @@ inline void ArrayData::removeElement(size_t index, ResourceManager* resources) {
 }
 
 template <typename T>
-inline bool ArrayData::addValue(T&& value, ResourceManager* resources) {
+inline bool ArrayData::addValue(const T& value, ResourceManager* resources) {
   ARDUINOJSON_ASSERT(resources != nullptr);
   auto slot = resources->allocVariant();
   if (!slot)
     return false;
   JsonVariant variant(slot.ptr(), resources);
-  if (!variant.set(detail::forward<T>(value))) {
+  if (!variant.set(value)) {
     resources->freeVariant(slot);
     return false;
   }
diff --git a/lib/ArduinoJson/src/ArduinoJson/Array/ElementProxy.hpp b/lib/ArduinoJson/src/ArduinoJson/Array/ElementProxy.hpp
index f36b68ea..06994a93 100644
--- a/lib/ArduinoJson/src/ArduinoJson/Array/ElementProxy.hpp
+++ b/lib/ArduinoJson/src/ArduinoJson/Array/ElementProxy.hpp
@@ -15,13 +15,18 @@ class ElementProxy : public VariantRefBase<ElementProxy<TUpstream>>,
                      public VariantOperators<ElementProxy<TUpstream>> {
   friend class VariantAttorney;
 
+  friend class VariantRefBase<ElementProxy<TUpstream>>;
+
+  template <typename, typename>
+  friend class MemberProxy;
+
+  template <typename>
+  friend class ElementProxy;
+
  public:
   ElementProxy(TUpstream upstream, size_t index)
       : upstream_(upstream), index_(index) {}
 
-  ElementProxy(const ElementProxy& src)
-      : upstream_(src.upstream_), index_(src.index_) {}
-
   ElementProxy& operator=(const ElementProxy& src) {
     this->set(src);
     return *this;
@@ -40,6 +45,11 @@ class ElementProxy : public VariantRefBase<ElementProxy<TUpstream>>,
   }
 
  private:
+  // clang-format off
+  ElementProxy(const ElementProxy& src)  // Error here? See https://arduinojson.org/v7/proxy-non-copyable/
+      : upstream_(src.upstream_), index_(src.index_) {}
+  // clang-format on
+
   ResourceManager* getResourceManager() const {
     return VariantAttorney::getResourceManager(upstream_);
   }
diff --git a/lib/ArduinoJson/src/ArduinoJson/Array/JsonArray.hpp b/lib/ArduinoJson/src/ArduinoJson/Array/JsonArray.hpp
index 0e3ea2ee..7f02f987 100644
--- a/lib/ArduinoJson/src/ArduinoJson/Array/JsonArray.hpp
+++ b/lib/ArduinoJson/src/ArduinoJson/Array/JsonArray.hpp
@@ -43,16 +43,18 @@ class JsonArray : public detail::VariantOperators<JsonArray> {
   // Appends a new (empty) element to the array.
   // Returns a reference to the new element.
   // https://arduinojson.org/v7/api/jsonarray/add/
-  template <typename T>
-  detail::enable_if_t<!detail::is_same<T, JsonVariant>::value, T> add() const {
+  template <typename T, detail::enable_if_t<
+                            !detail::is_same<T, JsonVariant>::value, int> = 0>
+  T add() const {
     return add<JsonVariant>().to<T>();
   }
 
   // Appends a new (null) element to the array.
   // Returns a reference to the new element.
   // https://arduinojson.org/v7/api/jsonarray/add/
-  template <typename T>
-  detail::enable_if_t<detail::is_same<T, JsonVariant>::value, T> add() const {
+  template <typename T, detail::enable_if_t<
+                            detail::is_same<T, JsonVariant>::value, int> = 0>
+  JsonVariant add() const {
     return JsonVariant(detail::ArrayData::addElement(data_, resources_),
                        resources_);
   }
@@ -66,7 +68,8 @@ class JsonArray : public detail::VariantOperators<JsonArray> {
 
   // Appends a value to the array.
   // https://arduinojson.org/v7/api/jsonarray/add/
-  template <typename T>
+  template <typename T,
+            detail::enable_if_t<!detail::is_const<T>::value, int> = 0>
   bool add(T* value) const {
     return detail::ArrayData::addValue(data_, value, resources_);
   }
@@ -114,9 +117,9 @@ class JsonArray : public detail::VariantOperators<JsonArray> {
 
   // Removes the element at the specified index.
   // https://arduinojson.org/v7/api/jsonarray/remove/
-  template <typename TVariant>
-  detail::enable_if_t<detail::IsVariant<TVariant>::value> remove(
-      TVariant variant) const {
+  template <typename TVariant,
+            detail::enable_if_t<detail::IsVariant<TVariant>::value, int> = 0>
+  void remove(const TVariant& variant) const {
     if (variant.template is<size_t>())
       remove(variant.template as<size_t>());
   }
@@ -129,21 +132,19 @@ class JsonArray : public detail::VariantOperators<JsonArray> {
 
   // Gets or sets the element at the specified index.
   // https://arduinojson.org/v7/api/jsonarray/subscript/
-  template <typename T>
-  detail::enable_if_t<detail::is_integral<T>::value,
-                      detail::ElementProxy<JsonArray>>
-  operator[](T index) const {
+  template <typename T,
+            detail::enable_if_t<detail::is_integral<T>::value, int> = 0>
+  detail::ElementProxy<JsonArray> operator[](T index) const {
     return {*this, size_t(index)};
   }
 
   // Gets or sets the element at the specified index.
   // https://arduinojson.org/v7/api/jsonarray/subscript/
-  template <typename TVariant>
-  detail::enable_if_t<detail::IsVariant<TVariant>::value,
-                      detail::ElementProxy<JsonArray>>
-  operator[](const TVariant& variant) const {
+  template <typename TVariant,
+            detail::enable_if_t<detail::IsVariant<TVariant>::value, int> = 0>
+  detail::ElementProxy<JsonArray> operator[](const TVariant& variant) const {
     if (variant.template is<size_t>())
-      return operator[](variant.template as<size_t>());
+      return {*this, variant.template as<size_t>()};
     else
       return {*this, size_t(-1)};
   }
diff --git a/lib/ArduinoJson/src/ArduinoJson/Array/JsonArrayConst.hpp b/lib/ArduinoJson/src/ArduinoJson/Array/JsonArrayConst.hpp
index 6b9db192..b0535187 100644
--- a/lib/ArduinoJson/src/ArduinoJson/Array/JsonArrayConst.hpp
+++ b/lib/ArduinoJson/src/ArduinoJson/Array/JsonArrayConst.hpp
@@ -45,9 +45,9 @@ class JsonArrayConst : public detail::VariantOperators<JsonArrayConst> {
 
   // Returns the element at the specified index.
   // https://arduinojson.org/v7/api/jsonarrayconst/subscript/
-  template <typename T>
-  detail::enable_if_t<detail::is_integral<T>::value, JsonVariantConst>
-  operator[](T index) const {
+  template <typename T,
+            detail::enable_if_t<detail::is_integral<T>::value, int> = 0>
+  JsonVariantConst operator[](T index) const {
     return JsonVariantConst(
         detail::ArrayData::getElement(data_, size_t(index), resources_),
         resources_);
@@ -55,9 +55,9 @@ class JsonArrayConst : public detail::VariantOperators<JsonArrayConst> {
 
   // Returns the element at the specified index.
   // https://arduinojson.org/v7/api/jsonarrayconst/subscript/
-  template <typename TVariant>
-  detail::enable_if_t<detail::IsVariant<TVariant>::value, JsonVariantConst>
-  operator[](const TVariant& variant) const {
+  template <typename TVariant,
+            detail::enable_if_t<detail::IsVariant<TVariant>::value, int> = 0>
+  JsonVariantConst operator[](const TVariant& variant) const {
     if (variant.template is<size_t>())
       return operator[](variant.template as<size_t>());
     else
diff --git a/lib/ArduinoJson/src/ArduinoJson/Array/Utilities.hpp b/lib/ArduinoJson/src/ArduinoJson/Array/Utilities.hpp
index 9073468c..200cb66b 100644
--- a/lib/ArduinoJson/src/ArduinoJson/Array/Utilities.hpp
+++ b/lib/ArduinoJson/src/ArduinoJson/Array/Utilities.hpp
@@ -11,27 +11,26 @@ ARDUINOJSON_BEGIN_PUBLIC_NAMESPACE
 
 // Copies a value to a JsonVariant.
 // This is a degenerated form of copyArray() to stop the recursion.
-template <typename T>
-inline detail::enable_if_t<!detail::is_array<T>::value, bool> copyArray(
-    const T& src, JsonVariant dst) {
+template <typename T, detail::enable_if_t<!detail::is_array<T>::value, int> = 0>
+inline bool copyArray(const T& src, JsonVariant dst) {
   return dst.set(src);
 }
 
 // Copies values from an array to a JsonArray or a JsonVariant.
 // https://arduinojson.org/v7/api/misc/copyarray/
-template <typename T, size_t N, typename TDestination>
-inline detail::enable_if_t<
-    !detail::is_base_of<JsonDocument, TDestination>::value, bool>
-copyArray(T (&src)[N], const TDestination& dst) {
+template <typename T, size_t N, typename TDestination,
+          detail::enable_if_t<
+              !detail::is_base_of<JsonDocument, TDestination>::value, int> = 0>
+inline bool copyArray(T (&src)[N], const TDestination& dst) {
   return copyArray(src, N, dst);
 }
 
 // Copies values from an array to a JsonArray or a JsonVariant.
 // https://arduinojson.org/v7/api/misc/copyarray/
-template <typename T, typename TDestination>
-inline detail::enable_if_t<
-    !detail::is_base_of<JsonDocument, TDestination>::value, bool>
-copyArray(const T* src, size_t len, const TDestination& dst) {
+template <typename T, typename TDestination,
+          detail::enable_if_t<
+              !detail::is_base_of<JsonDocument, TDestination>::value, int> = 0>
+inline bool copyArray(const T* src, size_t len, const TDestination& dst) {
   bool ok = true;
   for (size_t i = 0; i < len; i++) {
     ok &= copyArray(src[i], dst.template add<JsonVariant>());
@@ -62,9 +61,8 @@ inline bool copyArray(const T* src, size_t len, JsonDocument& dst) {
 
 // Copies a value from a JsonVariant.
 // This is a degenerated form of copyArray() to stop the recursion.
-template <typename T>
-inline detail::enable_if_t<!detail::is_array<T>::value, size_t> copyArray(
-    JsonVariantConst src, T& dst) {
+template <typename T, detail::enable_if_t<!detail::is_array<T>::value, int> = 0>
+inline size_t copyArray(JsonVariantConst src, T& dst) {
   dst = src.as<T>();
   return 1;
 }
@@ -102,11 +100,12 @@ inline size_t copyArray(JsonVariantConst src, char (&dst)[N]) {
 
 // Copies values from a JsonDocument to an array.
 // https://arduinojson.org/v7/api/misc/copyarray/
-template <typename TSource, typename T>
-inline detail::enable_if_t<detail::is_array<T>::value &&
-                               detail::is_base_of<JsonDocument, TSource>::value,
-                           size_t>
-copyArray(const TSource& src, T& dst) {
+template <
+    typename TSource, typename T,
+    detail::enable_if_t<detail::is_array<T>::value &&
+                            detail::is_base_of<JsonDocument, TSource>::value,
+                        int> = 0>
+inline size_t copyArray(const TSource& src, T& dst) {
   return copyArray(src.template as<JsonArrayConst>(), dst);
 }
 
diff --git a/lib/ArduinoJson/src/ArduinoJson/Deserialization/Reader.hpp b/lib/ArduinoJson/src/ArduinoJson/Deserialization/Reader.hpp
index fed87b34..e728047c 100644
--- a/lib/ArduinoJson/src/ArduinoJson/Deserialization/Reader.hpp
+++ b/lib/ArduinoJson/src/ArduinoJson/Deserialization/Reader.hpp
@@ -11,7 +11,7 @@
 
 ARDUINOJSON_BEGIN_PRIVATE_NAMESPACE
 
-// The default reader is a simple wrapper for Readers that are not copiable
+// The default reader is a simple wrapper for Readers that are not copyable
 template <typename TSource, typename Enable = void>
 struct Reader {
  public:
diff --git a/lib/ArduinoJson/src/ArduinoJson/Deserialization/deserialize.hpp b/lib/ArduinoJson/src/ArduinoJson/Deserialization/deserialize.hpp
index a95049a3..c1963a8f 100644
--- a/lib/ArduinoJson/src/ArduinoJson/Deserialization/deserialize.hpp
+++ b/lib/ArduinoJson/src/ArduinoJson/Deserialization/deserialize.hpp
@@ -55,10 +55,11 @@ DeserializationError doDeserialize(TDestination&& dst, TReader reader,
   return err;
 }
 
-template <template <typename> class TDeserializer, typename TDestination,
-          typename TStream, typename... Args,
-          typename = enable_if_t<  // issue #1897
-              !is_integral<typename first_or_void<Args...>::type>::value>>
+template <
+    template <typename> class TDeserializer, typename TDestination,
+    typename TStream, typename... Args,
+    enable_if_t<  // issue #1897
+        !is_integral<typename first_or_void<Args...>::type>::value, int> = 0>
 DeserializationError deserialize(TDestination&& dst, TStream&& input,
                                  Args... args) {
   return doDeserialize<TDeserializer>(
@@ -68,7 +69,7 @@ DeserializationError deserialize(TDestination&& dst, TStream&& input,
 
 template <template <typename> class TDeserializer, typename TDestination,
           typename TChar, typename Size, typename... Args,
-          typename = enable_if_t<is_integral<Size>::value>>
+          enable_if_t<is_integral<Size>::value, int> = 0>
 DeserializationError deserialize(TDestination&& dst, TChar* input,
                                  Size inputSize, Args... args) {
   return doDeserialize<TDeserializer>(dst, makeReader(input, size_t(inputSize)),
diff --git a/lib/ArduinoJson/src/ArduinoJson/Document/JsonDocument.hpp b/lib/ArduinoJson/src/ArduinoJson/Document/JsonDocument.hpp
index b145f0cb..09076232 100644
--- a/lib/ArduinoJson/src/ArduinoJson/Document/JsonDocument.hpp
+++ b/lib/ArduinoJson/src/ArduinoJson/Document/JsonDocument.hpp
@@ -36,14 +36,15 @@ class JsonDocument : public detail::VariantOperators<const JsonDocument&> {
   }
 
   // Construct from variant, array, or object
-  template <typename T>
-  JsonDocument(
-      const T& src, Allocator* alloc = detail::DefaultAllocator::instance(),
-      detail::enable_if_t<detail::IsVariant<T>::value ||
-                          detail::is_same<T, JsonArray>::value ||
-                          detail::is_same<T, JsonArrayConst>::value ||
-                          detail::is_same<T, JsonObject>::value ||
-                          detail::is_same<T, JsonObjectConst>::value>* = 0)
+  template <typename T,
+            detail::enable_if_t<detail::IsVariant<T>::value ||
+                                    detail::is_same<T, JsonArray>::value ||
+                                    detail::is_same<T, JsonArrayConst>::value ||
+                                    detail::is_same<T, JsonObject>::value ||
+                                    detail::is_same<T, JsonObjectConst>::value,
+                                int> = 0>
+  JsonDocument(const T& src,
+               Allocator* alloc = detail::DefaultAllocator::instance())
       : JsonDocument(alloc) {
     set(src);
   }
@@ -136,15 +137,17 @@ class JsonDocument : public detail::VariantOperators<const JsonDocument&> {
 
   // Replaces the root with the specified value.
   // https://arduinojson.org/v7/api/jsondocument/set/
-  template <typename T>
-  detail::enable_if_t<!detail::is_base_of<JsonDocument, T>::value, bool> set(
-      const T& src) {
+  template <
+      typename T,
+      detail::enable_if_t<!detail::is_base_of<JsonDocument, T>::value, int> = 0>
+  bool set(const T& src) {
     return to<JsonVariant>().set(src);
   }
 
   // Replaces the root with the specified value.
   // https://arduinojson.org/v7/api/jsondocument/set/
-  template <typename TChar>
+  template <typename TChar,
+            detail::enable_if_t<!detail::is_const<TChar>::value, int> = 0>
   bool set(TChar* src) {
     return to<JsonVariant>().set(src);
   }
@@ -167,64 +170,67 @@ class JsonDocument : public detail::VariantOperators<const JsonDocument&> {
 
   // DEPRECATED: use obj[key].is<T>() instead
   // https://arduinojson.org/v7/api/jsondocument/containskey/
-  template <typename TString>
+  template <typename TString,
+            detail::enable_if_t<detail::IsString<TString>::value, int> = 0>
   ARDUINOJSON_DEPRECATED("use doc[key].is<T>() instead")
-  detail::enable_if_t<detail::IsString<TString>::value, bool> containsKey(
-      const TString& key) const {
+  bool containsKey(const TString& key) const {
     return data_.getMember(detail::adaptString(key), &resources_) != 0;
   }
 
   // DEPRECATED: use obj[key].is<T>() instead
   // https://arduinojson.org/v7/api/jsondocument/containskey/
-  template <typename TVariant>
+  template <typename TVariant,
+            detail::enable_if_t<detail::IsVariant<TVariant>::value, int> = 0>
   ARDUINOJSON_DEPRECATED("use doc[key].is<T>() instead")
-  detail::enable_if_t<detail::IsVariant<TVariant>::value, bool> containsKey(
-      const TVariant& key) const {
+  bool containsKey(const TVariant& key) const {
     return containsKey(key.template as<const char*>());
   }
 
   // Gets or sets a root object's member.
   // https://arduinojson.org/v7/api/jsondocument/subscript/
-  template <typename TString>
-  detail::enable_if_t<detail::IsString<TString>::value,
-                      detail::MemberProxy<JsonDocument&, TString>>
-  operator[](const TString& key) {
-    return {*this, key};
+  template <typename TString,
+            detail::enable_if_t<detail::IsString<TString>::value, int> = 0>
+  detail::MemberProxy<JsonDocument&, detail::AdaptedString<TString>> operator[](
+      const TString& key) {
+    return {*this, detail::adaptString(key)};
   }
 
   // Gets or sets a root object's member.
   // https://arduinojson.org/v7/api/jsondocument/subscript/
-  template <typename TChar>
-  detail::enable_if_t<detail::IsString<TChar*>::value,
-                      detail::MemberProxy<JsonDocument&, TChar*>>
-  operator[](TChar* key) {
-    return {*this, key};
+  template <typename TChar,
+            detail::enable_if_t<detail::IsString<TChar*>::value &&
+                                    !detail::is_const<TChar>::value,
+                                int> = 0>
+  detail::MemberProxy<JsonDocument&, detail::AdaptedString<TChar*>> operator[](
+      TChar* key) {
+    return {*this, detail::adaptString(key)};
   }
 
   // Gets a root object's member.
   // https://arduinojson.org/v7/api/jsondocument/subscript/
-  template <typename TString>
-  detail::enable_if_t<detail::IsString<TString>::value, JsonVariantConst>
-  operator[](const TString& key) const {
+  template <typename TString,
+            detail::enable_if_t<detail::IsString<TString>::value, int> = 0>
+  JsonVariantConst operator[](const TString& key) const {
     return JsonVariantConst(
         data_.getMember(detail::adaptString(key), &resources_), &resources_);
   }
 
   // Gets a root object's member.
   // https://arduinojson.org/v7/api/jsondocument/subscript/
-  template <typename TChar>
-  detail::enable_if_t<detail::IsString<TChar*>::value, JsonVariantConst>
-  operator[](TChar* key) const {
+  template <typename TChar,
+            detail::enable_if_t<detail::IsString<TChar*>::value &&
+                                    !detail::is_const<TChar>::value,
+                                int> = 0>
+  JsonVariantConst operator[](TChar* key) const {
     return JsonVariantConst(
         data_.getMember(detail::adaptString(key), &resources_), &resources_);
   }
 
   // Gets or sets a root array's element.
   // https://arduinojson.org/v7/api/jsondocument/subscript/
-  template <typename T>
-  detail::enable_if_t<detail::is_integral<T>::value,
-                      detail::ElementProxy<JsonDocument&>>
-  operator[](T index) {
+  template <typename T,
+            detail::enable_if_t<detail::is_integral<T>::value, int> = 0>
+  detail::ElementProxy<JsonDocument&> operator[](T index) {
     return {*this, size_t(index)};
   }
 
@@ -236,9 +242,9 @@ class JsonDocument : public detail::VariantOperators<const JsonDocument&> {
 
   // Gets or sets a root object's member.
   // https://arduinojson.org/v7/api/jsondocument/subscript/
-  template <typename TVariant>
-  detail::enable_if_t<detail::IsVariant<TVariant>::value, JsonVariantConst>
-  operator[](const TVariant& key) const {
+  template <typename TVariant,
+            detail::enable_if_t<detail::IsVariant<TVariant>::value, int> = 0>
+  JsonVariantConst operator[](const TVariant& key) const {
     if (key.template is<JsonString>())
       return operator[](key.template as<JsonString>());
     if (key.template is<size_t>())
@@ -249,16 +255,18 @@ class JsonDocument : public detail::VariantOperators<const JsonDocument&> {
   // Appends a new (empty) element to the root array.
   // Returns a reference to the new element.
   // https://arduinojson.org/v7/api/jsondocument/add/
-  template <typename T>
-  detail::enable_if_t<!detail::is_same<T, JsonVariant>::value, T> add() {
+  template <typename T, detail::enable_if_t<
+                            !detail::is_same<T, JsonVariant>::value, int> = 0>
+  T add() {
     return add<JsonVariant>().to<T>();
   }
 
   // Appends a new (null) element to the root array.
   // Returns a reference to the new element.
   // https://arduinojson.org/v7/api/jsondocument/add/
-  template <typename T>
-  detail::enable_if_t<detail::is_same<T, JsonVariant>::value, T> add() {
+  template <typename T, detail::enable_if_t<
+                            detail::is_same<T, JsonVariant>::value, int> = 0>
+  JsonVariant add() {
     return JsonVariant(data_.addElement(&resources_), &resources_);
   }
 
@@ -271,41 +279,46 @@ class JsonDocument : public detail::VariantOperators<const JsonDocument&> {
 
   // Appends a value to the root array.
   // https://arduinojson.org/v7/api/jsondocument/add/
-  template <typename TChar>
+  template <typename TChar,
+            detail::enable_if_t<!detail::is_const<TChar>::value, int> = 0>
   bool add(TChar* value) {
     return data_.addValue(value, &resources_);
   }
 
   // Removes an element of the root array.
   // https://arduinojson.org/v7/api/jsondocument/remove/
-  template <typename T>
-  detail::enable_if_t<detail::is_integral<T>::value> remove(T index) {
+  template <typename T,
+            detail::enable_if_t<detail::is_integral<T>::value, int> = 0>
+  void remove(T index) {
     detail::VariantData::removeElement(getData(), size_t(index),
                                        getResourceManager());
   }
 
   // Removes a member of the root object.
   // https://arduinojson.org/v7/api/jsondocument/remove/
-  template <typename TChar>
-  detail::enable_if_t<detail::IsString<TChar*>::value> remove(TChar* key) {
+  template <typename TChar,
+            detail::enable_if_t<detail::IsString<TChar*>::value &&
+                                    !detail::is_const<TChar>::value,
+                                int> = 0>
+  void remove(TChar* key) {
     detail::VariantData::removeMember(getData(), detail::adaptString(key),
                                       getResourceManager());
   }
 
   // Removes a member of the root object.
   // https://arduinojson.org/v7/api/jsondocument/remove/
-  template <typename TString>
-  detail::enable_if_t<detail::IsString<TString>::value> remove(
-      const TString& key) {
+  template <typename TString,
+            detail::enable_if_t<detail::IsString<TString>::value, int> = 0>
+  void remove(const TString& key) {
     detail::VariantData::removeMember(getData(), detail::adaptString(key),
                                       getResourceManager());
   }
 
   // Removes a member of the root object or an element of the root array.
   // https://arduinojson.org/v7/api/jsondocument/remove/
-  template <typename TVariant>
-  detail::enable_if_t<detail::IsVariant<TVariant>::value> remove(
-      const TVariant& key) {
+  template <typename TVariant,
+            detail::enable_if_t<detail::IsVariant<TVariant>::value, int> = 0>
+  void remove(const TVariant& key) {
     if (key.template is<const char*>())
       remove(key.template as<const char*>());
     if (key.template is<size_t>())
diff --git a/lib/ArduinoJson/src/ArduinoJson/Json/JsonDeserializer.hpp b/lib/ArduinoJson/src/ArduinoJson/Json/JsonDeserializer.hpp
index 459f78af..fb03e695 100644
--- a/lib/ArduinoJson/src/ArduinoJson/Json/JsonDeserializer.hpp
+++ b/lib/ArduinoJson/src/ArduinoJson/Json/JsonDeserializer.hpp
@@ -270,10 +270,10 @@ class JsonDeserializer {
 
       JsonString key = stringBuilder_.str();
 
-      TFilter memberFilter = filter[key.c_str()];
+      TFilter memberFilter = filter[key];
 
       if (memberFilter.allow()) {
-        auto member = object.getMember(adaptString(key.c_str()), resources_);
+        auto member = object.getMember(adaptString(key), resources_);
         if (!member) {
           // Save key in memory pool.
           auto savedKey = stringBuilder_.save();
@@ -697,10 +697,11 @@ ARDUINOJSON_BEGIN_PUBLIC_NAMESPACE
 
 // Parses a JSON input, filters, and puts the result in a JsonDocument.
 // https://arduinojson.org/v7/api/json/deserializejson/
-template <typename TDestination, typename... Args>
-detail::enable_if_t<detail::is_deserialize_destination<TDestination>::value,
-                    DeserializationError>
-deserializeJson(TDestination&& dst, Args&&... args) {
+template <typename TDestination, typename... Args,
+          detail::enable_if_t<
+              detail::is_deserialize_destination<TDestination>::value, int> = 0>
+inline DeserializationError deserializeJson(TDestination&& dst,
+                                            Args&&... args) {
   using namespace detail;
   return deserialize<JsonDeserializer>(detail::forward<TDestination>(dst),
                                        detail::forward<Args>(args)...);
@@ -708,10 +709,11 @@ deserializeJson(TDestination&& dst, Args&&... args) {
 
 // Parses a JSON input, filters, and puts the result in a JsonDocument.
 // https://arduinojson.org/v7/api/json/deserializejson/
-template <typename TDestination, typename TChar, typename... Args>
-detail::enable_if_t<detail::is_deserialize_destination<TDestination>::value,
-                    DeserializationError>
-deserializeJson(TDestination&& dst, TChar* input, Args&&... args) {
+template <typename TDestination, typename TChar, typename... Args,
+          detail::enable_if_t<
+              detail::is_deserialize_destination<TDestination>::value, int> = 0>
+inline DeserializationError deserializeJson(TDestination&& dst, TChar* input,
+                                            Args&&... args) {
   using namespace detail;
   return deserialize<JsonDeserializer>(detail::forward<TDestination>(dst),
                                        input, detail::forward<Args>(args)...);
diff --git a/lib/ArduinoJson/src/ArduinoJson/Json/JsonSerializer.hpp b/lib/ArduinoJson/src/ArduinoJson/Json/JsonSerializer.hpp
index f9cfa599..da57b6bf 100644
--- a/lib/ArduinoJson/src/ArduinoJson/Json/JsonSerializer.hpp
+++ b/lib/ArduinoJson/src/ArduinoJson/Json/JsonSerializer.hpp
@@ -129,9 +129,10 @@ ARDUINOJSON_BEGIN_PUBLIC_NAMESPACE
 
 // Produces a minified JSON document.
 // https://arduinojson.org/v7/api/json/serializejson/
-template <typename TDestination>
-detail::enable_if_t<!detail::is_pointer<TDestination>::value, size_t>
-serializeJson(JsonVariantConst source, TDestination& destination) {
+template <
+    typename TDestination,
+    detail::enable_if_t<!detail::is_pointer<TDestination>::value, int> = 0>
+size_t serializeJson(JsonVariantConst source, TDestination& destination) {
   using namespace detail;
   return serialize<JsonSerializer>(source, destination);
 }
@@ -152,10 +153,10 @@ inline size_t measureJson(JsonVariantConst source) {
 }
 
 #if ARDUINOJSON_ENABLE_STD_STREAM
-template <typename T>
-inline detail::enable_if_t<detail::is_convertible<T, JsonVariantConst>::value,
-                           std::ostream&>
-operator<<(std::ostream& os, const T& source) {
+template <typename T,
+          detail::enable_if_t<
+              detail::is_convertible<T, JsonVariantConst>::value, int> = 0>
+inline std::ostream& operator<<(std::ostream& os, const T& source) {
   serializeJson(source, os);
   return os;
 }
diff --git a/lib/ArduinoJson/src/ArduinoJson/Json/PrettyJsonSerializer.hpp b/lib/ArduinoJson/src/ArduinoJson/Json/PrettyJsonSerializer.hpp
index 56cedf2e..7915c6ca 100644
--- a/lib/ArduinoJson/src/ArduinoJson/Json/PrettyJsonSerializer.hpp
+++ b/lib/ArduinoJson/src/ArduinoJson/Json/PrettyJsonSerializer.hpp
@@ -83,9 +83,11 @@ ARDUINOJSON_BEGIN_PUBLIC_NAMESPACE
 
 // Produces JsonDocument to create a prettified JSON document.
 // https://arduinojson.org/v7/api/json/serializejsonpretty/
-template <typename TDestination>
-detail::enable_if_t<!detail::is_pointer<TDestination>::value, size_t>
-serializeJsonPretty(JsonVariantConst source, TDestination& destination) {
+template <
+    typename TDestination,
+    detail::enable_if_t<!detail::is_pointer<TDestination>::value, int> = 0>
+inline size_t serializeJsonPretty(JsonVariantConst source,
+                                  TDestination& destination) {
   using namespace ArduinoJson::detail;
   return serialize<PrettyJsonSerializer>(source, destination);
 }
diff --git a/lib/ArduinoJson/src/ArduinoJson/Memory/StringBuffer.hpp b/lib/ArduinoJson/src/ArduinoJson/Memory/StringBuffer.hpp
index d5412393..e0259662 100644
--- a/lib/ArduinoJson/src/ArduinoJson/Memory/StringBuffer.hpp
+++ b/lib/ArduinoJson/src/ArduinoJson/Memory/StringBuffer.hpp
@@ -55,7 +55,7 @@ class StringBuffer {
   JsonString str() const {
     ARDUINOJSON_ASSERT(node_ != nullptr);
 
-    return JsonString(node_->data, node_->length, JsonString::Copied);
+    return JsonString(node_->data, node_->length);
   }
 
  private:
diff --git a/lib/ArduinoJson/src/ArduinoJson/Memory/StringBuilder.hpp b/lib/ArduinoJson/src/ArduinoJson/Memory/StringBuilder.hpp
index f3a842ac..e789952d 100644
--- a/lib/ArduinoJson/src/ArduinoJson/Memory/StringBuilder.hpp
+++ b/lib/ArduinoJson/src/ArduinoJson/Memory/StringBuilder.hpp
@@ -68,7 +68,7 @@ class StringBuilder {
   JsonString str() const {
     ARDUINOJSON_ASSERT(node_ != nullptr);
     node_->data[size_] = 0;
-    return JsonString(node_->data, size_, JsonString::Copied);
+    return JsonString(node_->data, size_);
   }
 
  private:
diff --git a/lib/ArduinoJson/src/ArduinoJson/Memory/VariantPool.hpp b/lib/ArduinoJson/src/ArduinoJson/Memory/VariantPool.hpp
deleted file mode 100644
index 5fe37bc7..00000000
--- a/lib/ArduinoJson/src/ArduinoJson/Memory/VariantPool.hpp
+++ /dev/null
@@ -1,63 +0,0 @@
-// ArduinoJson - https://arduinojson.org
-// Copyright © 2014-2024, Benoit BLANCHON
-// MIT License
-
-#pragma once
-
-#include <ArduinoJson/Memory/ResourceManager.hpp>
-#include <ArduinoJson/Polyfills/assert.hpp>
-#include <ArduinoJson/Polyfills/integer.hpp>
-
-ARDUINOJSON_BEGIN_PRIVATE_NAMESPACE
-
-class VariantSlot;
-using SlotId = uint_t<ARDUINOJSON_SLOT_ID_SIZE * 8>;
-using SlotCount = SlotId;
-const SlotId NULL_SLOT = SlotId(-1);
-
-class SlotWithId {
- public:
-  SlotWithId() : slot_(nullptr), id_(NULL_SLOT) {}
-  SlotWithId(VariantSlot* slot, SlotId id) : slot_(slot), id_(id) {
-    ARDUINOJSON_ASSERT((slot == nullptr) == (id == NULL_SLOT));
-  }
-
-  SlotId id() const {
-    return id_;
-  }
-
-  operator VariantSlot*() {
-    return slot_;
-  }
-
-  VariantSlot* operator->() {
-    ARDUINOJSON_ASSERT(slot_ != nullptr);
-    return slot_;
-  }
-
- private:
-  VariantSlot* slot_;
-  SlotId id_;
-};
-
-class VariantPool {
- public:
-  void create(SlotCount cap, Allocator* allocator);
-  void destroy(Allocator* allocator);
-
-  SlotWithId allocSlot();
-  VariantSlot* getSlot(SlotId id) const;
-  void clear();
-  void shrinkToFit(Allocator*);
-  SlotCount usage() const;
-
-  static SlotCount bytesToSlots(size_t);
-  static size_t slotsToBytes(SlotCount);
-
- private:
-  SlotCount capacity_;
-  SlotCount usage_;
-  VariantSlot* slots_;
-};
-
-ARDUINOJSON_END_PRIVATE_NAMESPACE
diff --git a/lib/ArduinoJson/src/ArduinoJson/Memory/VariantPoolImpl.hpp b/lib/ArduinoJson/src/ArduinoJson/Memory/VariantPoolImpl.hpp
deleted file mode 100644
index d53be32d..00000000
--- a/lib/ArduinoJson/src/ArduinoJson/Memory/VariantPoolImpl.hpp
+++ /dev/null
@@ -1,81 +0,0 @@
-// ArduinoJson - https://arduinojson.org
-// Copyright © 2014-2024, Benoit BLANCHON
-// MIT License
-
-#pragma once
-
-#include <ArduinoJson/Memory/VariantPool.hpp>
-#include <ArduinoJson/Variant/VariantSlot.hpp>
-
-ARDUINOJSON_BEGIN_PRIVATE_NAMESPACE
-
-inline void VariantPool::create(SlotCount cap, Allocator* allocator) {
-  ARDUINOJSON_ASSERT(cap > 0);
-  slots_ =
-      reinterpret_cast<VariantSlot*>(allocator->allocate(slotsToBytes(cap)));
-  capacity_ = slots_ ? cap : 0;
-  usage_ = 0;
-}
-
-inline void VariantPool::destroy(Allocator* allocator) {
-  if (slots_)
-    allocator->deallocate(slots_);
-  slots_ = nullptr;
-  capacity_ = 0;
-  usage_ = 0;
-}
-
-inline void VariantPool::shrinkToFit(Allocator* allocator) {
-  auto newSlots = reinterpret_cast<VariantSlot*>(
-      allocator->reallocate(slots_, slotsToBytes(usage_)));
-  if (newSlots) {
-    slots_ = newSlots;
-    capacity_ = usage_;
-  }
-}
-
-inline SlotWithId VariantPool::allocSlot() {
-  if (!slots_)
-    return {};
-  if (usage_ >= capacity_)
-    return {};
-  auto index = usage_++;
-  auto slot = &slots_[index];
-  return {new (slot) VariantSlot, SlotId(index)};
-}
-
-inline VariantSlot* VariantPool::getSlot(SlotId id) const {
-  ARDUINOJSON_ASSERT(id < usage_);
-  return &slots_[id];
-}
-
-inline SlotCount VariantPool::usage() const {
-  return usage_;
-}
-
-inline void VariantPool::clear() {
-  usage_ = 0;
-}
-
-inline SlotCount VariantPool::bytesToSlots(size_t n) {
-  return static_cast<SlotCount>(n / sizeof(VariantSlot));
-}
-
-inline size_t VariantPool::slotsToBytes(SlotCount n) {
-  return n * sizeof(VariantSlot);
-}
-
-inline SlotWithId VariantPoolList::allocFromFreeList() {
-  ARDUINOJSON_ASSERT(freeList_ != NULL_SLOT);
-  auto id = freeList_;
-  auto slot = getSlot(freeList_);
-  freeList_ = slot->next();
-  return {new (slot) VariantSlot, id};
-}
-
-inline void VariantPoolList::freeSlot(SlotWithId slot) {
-  slot->setNext(freeList_);
-  freeList_ = slot.id();
-}
-
-ARDUINOJSON_END_PRIVATE_NAMESPACE
diff --git a/lib/ArduinoJson/src/ArduinoJson/Memory/VariantPoolList.hpp b/lib/ArduinoJson/src/ArduinoJson/Memory/VariantPoolList.hpp
deleted file mode 100644
index 8ee5cef6..00000000
--- a/lib/ArduinoJson/src/ArduinoJson/Memory/VariantPoolList.hpp
+++ /dev/null
@@ -1,189 +0,0 @@
-// ArduinoJson - https://arduinojson.org
-// Copyright © 2014-2024, Benoit BLANCHON
-// MIT License
-
-#pragma once
-
-#include <ArduinoJson/Memory/VariantPool.hpp>
-#include <ArduinoJson/Polyfills/assert.hpp>
-
-ARDUINOJSON_BEGIN_PRIVATE_NAMESPACE
-
-using PoolCount = SlotId;
-
-class VariantPoolList {
- public:
-  VariantPoolList() = default;
-
-  ~VariantPoolList() {
-    ARDUINOJSON_ASSERT(count_ == 0);
-  }
-
-  friend void swap(VariantPoolList& a, VariantPoolList& b) {
-    bool aUsedPreallocated = a.pools_ == a.preallocatedPools_;
-    bool bUsedPreallocated = b.pools_ == b.preallocatedPools_;
-
-    // Who is using preallocated pools?
-    if (aUsedPreallocated && bUsedPreallocated) {
-      // both of us => swap preallocated pools
-      for (PoolCount i = 0; i < ARDUINOJSON_INITIAL_POOL_COUNT; i++)
-        swap_(a.preallocatedPools_[i], b.preallocatedPools_[i]);
-    } else if (bUsedPreallocated) {
-      // only b => copy b's preallocated pools and give him a's pointer
-      for (PoolCount i = 0; i < b.count_; i++)
-        a.preallocatedPools_[i] = b.preallocatedPools_[i];
-      b.pools_ = a.pools_;
-      a.pools_ = a.preallocatedPools_;
-    } else if (aUsedPreallocated) {
-      // only a => copy a's preallocated pools and give him b's pointer
-      for (PoolCount i = 0; i < a.count_; i++)
-        b.preallocatedPools_[i] = a.preallocatedPools_[i];
-      a.pools_ = b.pools_;
-      b.pools_ = b.preallocatedPools_;
-    } else {
-      // neither => swap pointers
-      swap_(a.pools_, b.pools_);
-    }
-
-    swap_(a.count_, b.count_);
-    swap_(a.capacity_, b.capacity_);
-    swap_(a.freeList_, b.freeList_);
-  }
-
-  VariantPoolList& operator=(VariantPoolList&& src) {
-    ARDUINOJSON_ASSERT(count_ == 0);
-    if (src.pools_ == src.preallocatedPools_) {
-      memcpy(preallocatedPools_, src.preallocatedPools_,
-             sizeof(preallocatedPools_));
-      pools_ = preallocatedPools_;
-    } else {
-      pools_ = src.pools_;
-      src.pools_ = nullptr;
-    }
-    count_ = src.count_;
-    capacity_ = src.capacity_;
-    src.count_ = 0;
-    src.capacity_ = 0;
-    return *this;
-  }
-
-  SlotWithId allocSlot(Allocator* allocator) {
-    // try to allocate from free list
-    if (freeList_ != NULL_SLOT) {
-      return allocFromFreeList();
-    }
-
-    // try to allocate from last pool (other pools are full)
-    if (count_) {
-      auto slot = allocFromLastPool();
-      if (slot)
-        return slot;
-    }
-
-    // create a new pool and try again
-    auto pool = addPool(allocator);
-    if (!pool)
-      return {};
-
-    return allocFromLastPool();
-  }
-
-  void freeSlot(SlotWithId slot);
-
-  VariantSlot* getSlot(SlotId id) const {
-    if (id == NULL_SLOT)
-      return nullptr;
-    auto poolIndex = SlotId(id / ARDUINOJSON_POOL_CAPACITY);
-    auto indexInPool = SlotId(id % ARDUINOJSON_POOL_CAPACITY);
-    ARDUINOJSON_ASSERT(poolIndex < count_);
-    return pools_[poolIndex].getSlot(indexInPool);
-  }
-
-  void clear(Allocator* allocator) {
-    for (PoolCount i = 0; i < count_; i++)
-      pools_[i].destroy(allocator);
-    count_ = 0;
-    freeList_ = NULL_SLOT;
-    if (pools_ != preallocatedPools_) {
-      allocator->deallocate(pools_);
-      pools_ = preallocatedPools_;
-      capacity_ = ARDUINOJSON_INITIAL_POOL_COUNT;
-    }
-  }
-
-  SlotCount usage() const {
-    SlotCount total = 0;
-    for (PoolCount i = 0; i < count_; i++)
-      total = SlotCount(total + pools_[i].usage());
-    return total;
-  }
-
-  void shrinkToFit(Allocator* allocator) {
-    if (count_ > 0)
-      pools_[count_ - 1].shrinkToFit(allocator);
-    if (pools_ != preallocatedPools_ && count_ != capacity_) {
-      pools_ = static_cast<VariantPool*>(
-          allocator->reallocate(pools_, count_ * sizeof(VariantPool)));
-      ARDUINOJSON_ASSERT(pools_ != nullptr);  // realloc to smaller can't fail
-      capacity_ = count_;
-    }
-  }
-
- private:
-  SlotWithId allocFromFreeList();
-
-  SlotWithId allocFromLastPool() {
-    ARDUINOJSON_ASSERT(count_ > 0);
-    auto poolIndex = SlotId(count_ - 1);
-    auto slot = pools_[poolIndex].allocSlot();
-    if (!slot)
-      return {};
-    return {slot, SlotId(poolIndex * ARDUINOJSON_POOL_CAPACITY + slot.id())};
-  }
-
-  VariantPool* addPool(Allocator* allocator) {
-    if (count_ == capacity_ && !increaseCapacity(allocator))
-      return nullptr;
-    auto pool = &pools_[count_++];
-    SlotCount poolCapacity = ARDUINOJSON_POOL_CAPACITY;
-    if (count_ == maxPools)  // last pool is smaller because of NULL_SLOT
-      poolCapacity--;
-    pool->create(poolCapacity, allocator);
-    return pool;
-  }
-
-  bool increaseCapacity(Allocator* allocator) {
-    if (capacity_ == maxPools)
-      return false;
-    void* newPools;
-    auto newCapacity = PoolCount(capacity_ * 2);
-
-    if (pools_ == preallocatedPools_) {
-      newPools = allocator->allocate(newCapacity * sizeof(VariantPool));
-      if (!newPools)
-        return false;
-      memcpy(newPools, preallocatedPools_, sizeof(preallocatedPools_));
-    } else {
-      newPools =
-          allocator->reallocate(pools_, newCapacity * sizeof(VariantPool));
-      if (!newPools)
-        return false;
-    }
-
-    pools_ = static_cast<VariantPool*>(newPools);
-    capacity_ = newCapacity;
-    return true;
-  }
-
-  VariantPool preallocatedPools_[ARDUINOJSON_INITIAL_POOL_COUNT];
-  VariantPool* pools_ = preallocatedPools_;
-  PoolCount count_ = 0;
-  PoolCount capacity_ = ARDUINOJSON_INITIAL_POOL_COUNT;
-  SlotId freeList_ = NULL_SLOT;
-
- public:
-  static const PoolCount maxPools =
-      PoolCount(NULL_SLOT / ARDUINOJSON_POOL_CAPACITY + 1);
-};
-
-ARDUINOJSON_END_PRIVATE_NAMESPACE
diff --git a/lib/ArduinoJson/src/ArduinoJson/MsgPack/MsgPackDeserializer.hpp b/lib/ArduinoJson/src/ArduinoJson/MsgPack/MsgPackDeserializer.hpp
index 0c32f58b..674470d0 100644
--- a/lib/ArduinoJson/src/ArduinoJson/MsgPack/MsgPackDeserializer.hpp
+++ b/lib/ArduinoJson/src/ArduinoJson/MsgPack/MsgPackDeserializer.hpp
@@ -464,10 +464,11 @@ ARDUINOJSON_BEGIN_PUBLIC_NAMESPACE
 
 // Parses a MessagePack input and puts the result in a JsonDocument.
 // https://arduinojson.org/v7/api/msgpack/deserializemsgpack/
-template <typename TDestination, typename... Args>
-detail::enable_if_t<detail::is_deserialize_destination<TDestination>::value,
-                    DeserializationError>
-deserializeMsgPack(TDestination&& dst, Args&&... args) {
+template <typename TDestination, typename... Args,
+          detail::enable_if_t<
+              detail::is_deserialize_destination<TDestination>::value, int> = 0>
+inline DeserializationError deserializeMsgPack(TDestination&& dst,
+                                               Args&&... args) {
   using namespace detail;
   return deserialize<MsgPackDeserializer>(detail::forward<TDestination>(dst),
                                           detail::forward<Args>(args)...);
@@ -475,10 +476,11 @@ deserializeMsgPack(TDestination&& dst, Args&&... args) {
 
 // Parses a MessagePack input and puts the result in a JsonDocument.
 // https://arduinojson.org/v7/api/msgpack/deserializemsgpack/
-template <typename TDestination, typename TChar, typename... Args>
-detail::enable_if_t<detail::is_deserialize_destination<TDestination>::value,
-                    DeserializationError>
-deserializeMsgPack(TDestination&& dst, TChar* input, Args&&... args) {
+template <typename TDestination, typename TChar, typename... Args,
+          detail::enable_if_t<
+              detail::is_deserialize_destination<TDestination>::value, int> = 0>
+inline DeserializationError deserializeMsgPack(TDestination&& dst, TChar* input,
+                                               Args&&... args) {
   using namespace detail;
   return deserialize<MsgPackDeserializer>(detail::forward<TDestination>(dst),
                                           input,
diff --git a/lib/ArduinoJson/src/ArduinoJson/MsgPack/MsgPackSerializer.hpp b/lib/ArduinoJson/src/ArduinoJson/MsgPack/MsgPackSerializer.hpp
index 3058ad89..4eb5d2cc 100644
--- a/lib/ArduinoJson/src/ArduinoJson/MsgPack/MsgPackSerializer.hpp
+++ b/lib/ArduinoJson/src/ArduinoJson/MsgPack/MsgPackSerializer.hpp
@@ -96,7 +96,7 @@ class MsgPackSerializer : public VariantDataVisitor<size_t> {
   }
 
   size_t visit(JsonString value) {
-    ARDUINOJSON_ASSERT(value != NULL);
+    ARDUINOJSON_ASSERT(!value.isNull());
 
     auto n = value.size();
 
@@ -218,9 +218,10 @@ ARDUINOJSON_BEGIN_PUBLIC_NAMESPACE
 
 // Produces a MessagePack document.
 // https://arduinojson.org/v7/api/msgpack/serializemsgpack/
-template <typename TDestination>
-detail::enable_if_t<!detail::is_pointer<TDestination>::value, size_t>
-serializeMsgPack(JsonVariantConst source, TDestination& output) {
+template <
+    typename TDestination,
+    detail::enable_if_t<!detail::is_pointer<TDestination>::value, int> = 0>
+inline size_t serializeMsgPack(JsonVariantConst source, TDestination& output) {
   using namespace ArduinoJson::detail;
   return serialize<MsgPackSerializer>(source, output);
 }
diff --git a/lib/ArduinoJson/src/ArduinoJson/Object/JsonObject.hpp b/lib/ArduinoJson/src/ArduinoJson/Object/JsonObject.hpp
index 379e8e4a..088cea91 100644
--- a/lib/ArduinoJson/src/ArduinoJson/Object/JsonObject.hpp
+++ b/lib/ArduinoJson/src/ArduinoJson/Object/JsonObject.hpp
@@ -101,32 +101,31 @@ class JsonObject : public detail::VariantOperators<JsonObject> {
 
   // Gets or sets the member with specified key.
   // https://arduinojson.org/v7/api/jsonobject/subscript/
-  template <typename TString>
-  detail::enable_if_t<detail::IsString<TString>::value,
-                      detail::MemberProxy<JsonObject, TString>>
-  operator[](const TString& key) const {
-    return {*this, key};
+  template <typename TString,
+            detail::enable_if_t<detail::IsString<TString>::value, int> = 0>
+  detail::MemberProxy<JsonObject, detail::AdaptedString<TString>> operator[](
+      const TString& key) const {
+    return {*this, detail::adaptString(key)};
   }
 
   // Gets or sets the member with specified key.
   // https://arduinojson.org/v7/api/jsonobject/subscript/
-  template <typename TChar>
-  detail::enable_if_t<detail::IsString<TChar*>::value,
-                      detail::MemberProxy<JsonObject, TChar*>>
-  operator[](TChar* key) const {
-    return {*this, key};
+  template <typename TChar,
+            detail::enable_if_t<detail::IsString<TChar*>::value &&
+                                    !detail::is_const<TChar>::value,
+                                int> = 0>
+  detail::MemberProxy<JsonObject, detail::AdaptedString<TChar*>> operator[](
+      TChar* key) const {
+    return {*this, detail::adaptString(key)};
   }
 
   // Gets or sets the member with specified key.
   // https://arduinojson.org/v7/api/jsonobject/subscript/
-  template <typename TVariant>
-  detail::enable_if_t<detail::IsVariant<TVariant>::value,
-                      detail::MemberProxy<JsonObject, JsonString>>
-  operator[](const TVariant& key) const {
-    if (key.template is<JsonString>())
-      return {*this, key.template as<JsonString>()};
-    else
-      return {*this, nullptr};
+  template <typename TVariant,
+            detail::enable_if_t<detail::IsVariant<TVariant>::value, int> = 0>
+  detail::MemberProxy<JsonObject, detail::AdaptedString<JsonString>> operator[](
+      const TVariant& key) const {
+    return {*this, detail::adaptString(key.template as<JsonString>())};
   }
 
   // Removes the member at the specified iterator.
@@ -137,18 +136,18 @@ class JsonObject : public detail::VariantOperators<JsonObject> {
 
   // Removes the member with the specified key.
   // https://arduinojson.org/v7/api/jsonobject/remove/
-  template <typename TString>
-  detail::enable_if_t<detail::IsString<TString>::value> remove(
-      const TString& key) const {
+  template <typename TString,
+            detail::enable_if_t<detail::IsString<TString>::value, int> = 0>
+  void remove(const TString& key) const {
     detail::ObjectData::removeMember(data_, detail::adaptString(key),
                                      resources_);
   }
 
   // Removes the member with the specified key.
   // https://arduinojson.org/v7/api/jsonobject/remove/
-  template <typename TVariant>
-  detail::enable_if_t<detail::IsVariant<TVariant>::value> remove(
-      const TVariant& key) const {
+  template <typename TVariant,
+            detail::enable_if_t<detail::IsVariant<TVariant>::value, int> = 0>
+  void remove(const TVariant& key) const {
     if (key.template is<const char*>())
       remove(key.template as<const char*>());
   }
@@ -163,30 +162,32 @@ class JsonObject : public detail::VariantOperators<JsonObject> {
 
   // DEPRECATED: use obj[key].is<T>() instead
   // https://arduinojson.org/v7/api/jsonobject/containskey/
-  template <typename TString>
+  template <typename TString,
+            detail::enable_if_t<detail::IsString<TString>::value, int> = 0>
   ARDUINOJSON_DEPRECATED("use obj[key].is<T>() instead")
-  detail::enable_if_t<detail::IsString<TString>::value, bool> containsKey(
-      const TString& key) const {
+  bool containsKey(const TString& key) const {
     return detail::ObjectData::getMember(data_, detail::adaptString(key),
                                          resources_) != 0;
   }
 
   // DEPRECATED: use obj["key"].is<T>() instead
   // https://arduinojson.org/v7/api/jsonobject/containskey/
-  template <typename TChar>
+  template <typename TChar,
+            detail::enable_if_t<detail::IsString<TChar*>::value &&
+                                    !detail::is_const<TChar>::value,
+                                int> = 0>
   ARDUINOJSON_DEPRECATED("use obj[\"key\"].is<T>() instead")
-  detail::enable_if_t<detail::IsString<TChar*>::value, bool> containsKey(
-      TChar* key) const {
+  bool containsKey(TChar* key) const {
     return detail::ObjectData::getMember(data_, detail::adaptString(key),
                                          resources_) != 0;
   }
 
   // DEPRECATED: use obj[key].is<T>() instead
   // https://arduinojson.org/v7/api/jsonobject/containskey/
-  template <typename TVariant>
+  template <typename TVariant,
+            detail::enable_if_t<detail::IsVariant<TVariant>::value, int> = 0>
   ARDUINOJSON_DEPRECATED("use obj[key].is<T>() instead")
-  detail::enable_if_t<detail::IsVariant<TVariant>::value, bool> containsKey(
-      const TVariant& key) const {
+  bool containsKey(const TVariant& key) const {
     return containsKey(key.template as<const char*>());
   }
 
diff --git a/lib/ArduinoJson/src/ArduinoJson/Object/JsonObjectConst.hpp b/lib/ArduinoJson/src/ArduinoJson/Object/JsonObjectConst.hpp
index 6b0de202..6a7218fe 100644
--- a/lib/ArduinoJson/src/ArduinoJson/Object/JsonObjectConst.hpp
+++ b/lib/ArduinoJson/src/ArduinoJson/Object/JsonObjectConst.hpp
@@ -70,10 +70,10 @@ class JsonObjectConst : public detail::VariantOperators<JsonObjectConst> {
 
   // DEPRECATED: use obj[key].is<T>() instead
   // https://arduinojson.org/v7/api/jsonobjectconst/containskey/
-  template <typename TString>
+  template <typename TString,
+            detail::enable_if_t<detail::IsString<TString>::value, int> = 0>
   ARDUINOJSON_DEPRECATED("use obj[key].is<T>() instead")
-  detail::enable_if_t<detail::IsString<TString>::value, bool> containsKey(
-      const TString& key) const {
+  bool containsKey(const TString& key) const {
     return detail::ObjectData::getMember(data_, detail::adaptString(key),
                                          resources_) != 0;
   }
@@ -89,18 +89,18 @@ class JsonObjectConst : public detail::VariantOperators<JsonObjectConst> {
 
   // DEPRECATED: use obj[key].is<T>() instead
   // https://arduinojson.org/v7/api/jsonobjectconst/containskey/
-  template <typename TVariant>
+  template <typename TVariant,
+            detail::enable_if_t<detail::IsVariant<TVariant>::value, int> = 0>
   ARDUINOJSON_DEPRECATED("use obj[key].is<T>() instead")
-  detail::enable_if_t<detail::IsVariant<TVariant>::value, bool> containsKey(
-      const TVariant& key) const {
+  bool containsKey(const TVariant& key) const {
     return containsKey(key.template as<const char*>());
   }
 
   // Gets the member with specified key.
   // https://arduinojson.org/v7/api/jsonobjectconst/subscript/
-  template <typename TString>
-  detail::enable_if_t<detail::IsString<TString>::value, JsonVariantConst>
-  operator[](const TString& key) const {
+  template <typename TString,
+            detail::enable_if_t<detail::IsString<TString>::value, int> = 0>
+  JsonVariantConst operator[](const TString& key) const {
     return JsonVariantConst(detail::ObjectData::getMember(
                                 data_, detail::adaptString(key), resources_),
                             resources_);
@@ -108,9 +108,11 @@ class JsonObjectConst : public detail::VariantOperators<JsonObjectConst> {
 
   // Gets the member with specified key.
   // https://arduinojson.org/v7/api/jsonobjectconst/subscript/
-  template <typename TChar>
-  detail::enable_if_t<detail::IsString<TChar*>::value, JsonVariantConst>
-  operator[](TChar* key) const {
+  template <typename TChar,
+            detail::enable_if_t<detail::IsString<TChar*>::value &&
+                                    !detail::is_const<TChar>::value,
+                                int> = 0>
+  JsonVariantConst operator[](TChar* key) const {
     return JsonVariantConst(detail::ObjectData::getMember(
                                 data_, detail::adaptString(key), resources_),
                             resources_);
@@ -118,9 +120,9 @@ class JsonObjectConst : public detail::VariantOperators<JsonObjectConst> {
 
   // Gets the member with specified key.
   // https://arduinojson.org/v7/api/jsonobjectconst/subscript/
-  template <typename TVariant>
-  detail::enable_if_t<detail::IsVariant<TVariant>::value, JsonVariantConst>
-  operator[](const TVariant& key) const {
+  template <typename TVariant,
+            detail::enable_if_t<detail::IsVariant<TVariant>::value, int> = 0>
+  JsonVariantConst operator[](const TVariant& key) const {
     if (key.template is<JsonString>())
       return operator[](key.template as<JsonString>());
     else
diff --git a/lib/ArduinoJson/src/ArduinoJson/Object/MemberProxy.hpp b/lib/ArduinoJson/src/ArduinoJson/Object/MemberProxy.hpp
index eb9feede..f1e9b421 100644
--- a/lib/ArduinoJson/src/ArduinoJson/Object/MemberProxy.hpp
+++ b/lib/ArduinoJson/src/ArduinoJson/Object/MemberProxy.hpp
@@ -10,19 +10,24 @@ ARDUINOJSON_BEGIN_PRIVATE_NAMESPACE
 
 // A proxy class to get or set a member of an object.
 // https://arduinojson.org/v7/api/jsonobject/subscript/
-template <typename TUpstream, typename TStringRef>
+template <typename TUpstream, typename AdaptedString>
 class MemberProxy
-    : public VariantRefBase<MemberProxy<TUpstream, TStringRef>>,
-      public VariantOperators<MemberProxy<TUpstream, TStringRef>> {
+    : public VariantRefBase<MemberProxy<TUpstream, AdaptedString>>,
+      public VariantOperators<MemberProxy<TUpstream, AdaptedString>> {
   friend class VariantAttorney;
 
+  friend class VariantRefBase<MemberProxy<TUpstream, AdaptedString>>;
+
+  template <typename, typename>
+  friend class MemberProxy;
+
+  template <typename>
+  friend class ElementProxy;
+
  public:
-  MemberProxy(TUpstream upstream, TStringRef key)
+  MemberProxy(TUpstream upstream, AdaptedString key)
       : upstream_(upstream), key_(key) {}
 
-  MemberProxy(const MemberProxy& src)
-      : upstream_(src.upstream_), key_(src.key_) {}
-
   MemberProxy& operator=(const MemberProxy& src) {
     this->set(src);
     return *this;
@@ -34,20 +39,25 @@ class MemberProxy
     return *this;
   }
 
-  template <typename T>
+  template <typename T, enable_if_t<!is_const<T>::value, int> = 0>
   MemberProxy& operator=(T* src) {
     this->set(src);
     return *this;
   }
 
  private:
+  // clang-format off
+  MemberProxy(const MemberProxy& src) // Error here? See https://arduinojson.org/v7/proxy-non-copyable/
+      : upstream_(src.upstream_), key_(src.key_) {}
+  // clang-format on
+
   ResourceManager* getResourceManager() const {
     return VariantAttorney::getResourceManager(upstream_);
   }
 
   VariantData* getData() const {
     return VariantData::getMember(
-        VariantAttorney::getData(upstream_), adaptString(key_),
+        VariantAttorney::getData(upstream_), key_,
         VariantAttorney::getResourceManager(upstream_));
   }
 
@@ -55,13 +65,13 @@ class MemberProxy
     auto data = VariantAttorney::getOrCreateData(upstream_);
     if (!data)
       return nullptr;
-    return data->getOrAddMember(adaptString(key_),
+    return data->getOrAddMember(key_,
                                 VariantAttorney::getResourceManager(upstream_));
   }
 
  private:
   TUpstream upstream_;
-  TStringRef key_;
+  AdaptedString key_;
 };
 
 ARDUINOJSON_END_PRIVATE_NAMESPACE
diff --git a/lib/ArduinoJson/src/ArduinoJson/Polyfills/type_traits.hpp b/lib/ArduinoJson/src/ArduinoJson/Polyfills/type_traits.hpp
index 3004695a..471d352c 100644
--- a/lib/ArduinoJson/src/ArduinoJson/Polyfills/type_traits.hpp
+++ b/lib/ArduinoJson/src/ArduinoJson/Polyfills/type_traits.hpp
@@ -5,6 +5,7 @@
 #pragma once
 
 #include "type_traits/conditional.hpp"
+#include "type_traits/decay.hpp"
 #include "type_traits/enable_if.hpp"
 #include "type_traits/function_traits.hpp"
 #include "type_traits/integral_constant.hpp"
diff --git a/lib/ArduinoJson/src/ArduinoJson/Polyfills/type_traits/decay.hpp b/lib/ArduinoJson/src/ArduinoJson/Polyfills/type_traits/decay.hpp
new file mode 100644
index 00000000..29b4b6ee
--- /dev/null
+++ b/lib/ArduinoJson/src/ArduinoJson/Polyfills/type_traits/decay.hpp
@@ -0,0 +1,33 @@
+// ArduinoJson - https://arduinojson.org
+// Copyright © 2014-2024, Benoit BLANCHON
+// MIT License
+
+#pragma once
+
+#include <stddef.h>  // size_t
+
+#include <ArduinoJson/Namespace.hpp>
+
+ARDUINOJSON_BEGIN_PRIVATE_NAMESPACE
+
+template <typename T>
+struct decay {
+  using type = T;
+};
+
+template <typename T>
+struct decay<T&> : decay<T> {};
+
+template <typename T>
+struct decay<T&&> : decay<T> {};
+
+template <typename T>
+struct decay<T[]> : decay<T*> {};
+
+template <typename T, size_t N>
+struct decay<T[N]> : decay<T*> {};
+
+template <typename T>
+using decay_t = typename decay<T>::type;
+
+ARDUINOJSON_END_PRIVATE_NAMESPACE
diff --git a/lib/ArduinoJson/src/ArduinoJson/Serialization/Writer.hpp b/lib/ArduinoJson/src/ArduinoJson/Serialization/Writer.hpp
index e35d7e91..caea19f1 100644
--- a/lib/ArduinoJson/src/ArduinoJson/Serialization/Writer.hpp
+++ b/lib/ArduinoJson/src/ArduinoJson/Serialization/Writer.hpp
@@ -8,7 +8,7 @@
 
 ARDUINOJSON_BEGIN_PRIVATE_NAMESPACE
 
-// The default writer is a simple wrapper for Writers that are not copiable
+// The default writer is a simple wrapper for Writers that are not copyable
 template <typename TDestination, typename Enable = void>
 class Writer {
  public:
diff --git a/lib/ArduinoJson/src/ArduinoJson/Strings/Adapters/FlashString.hpp b/lib/ArduinoJson/src/ArduinoJson/Strings/Adapters/FlashString.hpp
index 4cbbc0f4..29ca1c3b 100644
--- a/lib/ArduinoJson/src/ArduinoJson/Strings/Adapters/FlashString.hpp
+++ b/lib/ArduinoJson/src/ArduinoJson/Strings/Adapters/FlashString.hpp
@@ -34,7 +34,7 @@ class FlashString {
     return size_;
   }
 
-  friend bool stringEquals(FlashString a, SizedRamString b) {
+  friend bool stringEquals(FlashString a, RamString b) {
     ARDUINOJSON_ASSERT(a.typeSortKey < b.typeSortKey);
     ARDUINOJSON_ASSERT(!a.isNull());
     ARDUINOJSON_ASSERT(!b.isNull());
@@ -43,7 +43,7 @@ class FlashString {
     return ::memcmp_P(b.data(), a.str_, a.size_) == 0;
   }
 
-  friend int stringCompare(FlashString a, SizedRamString b) {
+  friend int stringCompare(FlashString a, RamString b) {
     ARDUINOJSON_ASSERT(a.typeSortKey < b.typeSortKey);
     ARDUINOJSON_ASSERT(!a.isNull());
     ARDUINOJSON_ASSERT(!b.isNull());
@@ -63,7 +63,7 @@ class FlashString {
     ::memcpy_P(p, s.str_, n);
   }
 
-  bool isLinked() const {
+  bool isStatic() const {
     return false;
   }
 
diff --git a/lib/ArduinoJson/src/ArduinoJson/Strings/Adapters/JsonString.hpp b/lib/ArduinoJson/src/ArduinoJson/Strings/Adapters/JsonString.hpp
deleted file mode 100644
index b611bcf8..00000000
--- a/lib/ArduinoJson/src/ArduinoJson/Strings/Adapters/JsonString.hpp
+++ /dev/null
@@ -1,35 +0,0 @@
-// ArduinoJson - https://arduinojson.org
-// Copyright © 2014-2024, Benoit BLANCHON
-// MIT License
-
-#pragma once
-
-#include <ArduinoJson/Strings/Adapters/RamString.hpp>
-#include <ArduinoJson/Strings/JsonString.hpp>
-#include <ArduinoJson/Strings/StringAdapter.hpp>
-
-ARDUINOJSON_BEGIN_PRIVATE_NAMESPACE
-
-class JsonStringAdapter : public SizedRamString {
- public:
-  JsonStringAdapter(const JsonString& s)
-      : SizedRamString(s.c_str(), s.size()), linked_(s.isLinked()) {}
-
-  bool isLinked() const {
-    return linked_;
-  }
-
- private:
-  bool linked_;
-};
-
-template <>
-struct StringAdapter<JsonString> {
-  using AdaptedString = JsonStringAdapter;
-
-  static AdaptedString adapt(const JsonString& s) {
-    return AdaptedString(s);
-  }
-};
-
-ARDUINOJSON_END_PRIVATE_NAMESPACE
diff --git a/lib/ArduinoJson/src/ArduinoJson/Strings/Adapters/RamString.hpp b/lib/ArduinoJson/src/ArduinoJson/Strings/Adapters/RamString.hpp
index 0864c934..5477b232 100644
--- a/lib/ArduinoJson/src/ArduinoJson/Strings/Adapters/RamString.hpp
+++ b/lib/ArduinoJson/src/ArduinoJson/Strings/Adapters/RamString.hpp
@@ -17,18 +17,26 @@ template <typename T>
 struct IsChar
     : integral_constant<bool, is_integral<T>::value && sizeof(T) == 1> {};
 
-class ZeroTerminatedRamString {
+class RamString {
  public:
-  static const size_t typeSortKey = 3;
-
-  ZeroTerminatedRamString(const char* str) : str_(str) {}
+  static const size_t typeSortKey = 2;
+#if ARDUINOJSON_SIZEOF_POINTER <= 2
+  static constexpr size_t sizeMask = size_t(-1) >> 1;
+#else
+  static constexpr size_t sizeMask = size_t(-1);
+#endif
+
+  RamString(const char* str, size_t sz, bool isStatic = false)
+      : str_(str), size_(sz & sizeMask), static_(isStatic) {
+    ARDUINOJSON_ASSERT(size_ == sz);
+  }
 
   bool isNull() const {
     return !str_;
   }
 
-  FORCE_INLINE size_t size() const {
-    return str_ ? ::strlen(str_) : 0;
+  size_t size() const {
+    return size_;
   }
 
   char operator[](size_t i) const {
@@ -41,86 +49,55 @@ class ZeroTerminatedRamString {
     return str_;
   }
 
-  bool isLinked() const {
-    return false;
+  bool isStatic() const {
+    return static_;
   }
 
  protected:
   const char* str_;
+
+#if ARDUINOJSON_SIZEOF_POINTER <= 2
+  // Use a bitfield only on 8-bit microcontrollers
+  size_t size_ : sizeof(size_t) * 8 - 1;
+  bool static_ : 1;
+#else
+  size_t size_;
+  bool static_;
+#endif
 };
 
 template <typename TChar>
 struct StringAdapter<TChar*, enable_if_t<IsChar<TChar>::value>> {
-  using AdaptedString = ZeroTerminatedRamString;
-
-  static AdaptedString adapt(const TChar* p) {
-    return AdaptedString(reinterpret_cast<const char*>(p));
-  }
-};
-
-template <typename TChar, size_t N>
-struct StringAdapter<TChar[N], enable_if_t<IsChar<TChar>::value>> {
-  using AdaptedString = ZeroTerminatedRamString;
+  using AdaptedString = RamString;
 
   static AdaptedString adapt(const TChar* p) {
-    return AdaptedString(reinterpret_cast<const char*>(p));
-  }
-};
-
-class StaticStringAdapter : public ZeroTerminatedRamString {
- public:
-  StaticStringAdapter(const char* str) : ZeroTerminatedRamString(str) {}
-
-  bool isLinked() const {
-    return true;
+    auto str = reinterpret_cast<const char*>(p);
+    return AdaptedString(str, str ? ::strlen(str) : 0);
   }
 };
 
-template <>
-struct StringAdapter<const char*, void> {
-  using AdaptedString = StaticStringAdapter;
+template <size_t N>
+struct StringAdapter<const char (&)[N]> {
+  using AdaptedString = RamString;
 
-  static AdaptedString adapt(const char* p) {
-    return AdaptedString(p);
+  static AdaptedString adapt(const char (&p)[N]) {
+    return RamString(p, N - 1, true);
   }
 };
 
-class SizedRamString {
- public:
-  static const size_t typeSortKey = 2;
-
-  SizedRamString(const char* str, size_t sz) : str_(str), size_(sz) {}
-
-  bool isNull() const {
-    return !str_;
-  }
-
-  size_t size() const {
-    return size_;
-  }
-
-  char operator[](size_t i) const {
-    ARDUINOJSON_ASSERT(str_ != 0);
-    ARDUINOJSON_ASSERT(i <= size());
-    return str_[i];
-  }
-
-  const char* data() const {
-    return str_;
-  }
+template <typename TChar, size_t N>
+struct StringAdapter<TChar[N], enable_if_t<IsChar<TChar>::value>> {
+  using AdaptedString = RamString;
 
-  bool isLinked() const {
-    return false;
+  static AdaptedString adapt(const TChar* p) {
+    auto str = reinterpret_cast<const char*>(p);
+    return AdaptedString(str, str ? ::strlen(str) : 0);
   }
-
- protected:
-  const char* str_;
-  size_t size_;
 };
 
 template <typename TChar>
 struct SizedStringAdapter<TChar*, enable_if_t<IsChar<TChar>::value>> {
-  using AdaptedString = SizedRamString;
+  using AdaptedString = RamString;
 
   static AdaptedString adapt(const TChar* p, size_t n) {
     return AdaptedString(reinterpret_cast<const char*>(p), n);
diff --git a/lib/ArduinoJson/src/ArduinoJson/Strings/Adapters/StringObject.hpp b/lib/ArduinoJson/src/ArduinoJson/Strings/Adapters/StringObject.hpp
index d29d6537..1547ab9c 100644
--- a/lib/ArduinoJson/src/ArduinoJson/Strings/Adapters/StringObject.hpp
+++ b/lib/ArduinoJson/src/ArduinoJson/Strings/Adapters/StringObject.hpp
@@ -15,7 +15,7 @@ struct StringAdapter<
     T,
     enable_if_t<(string_traits<T>::has_cstr || string_traits<T>::has_data) &&
                 (string_traits<T>::has_length || string_traits<T>::has_size)>> {
-  using AdaptedString = SizedRamString;
+  using AdaptedString = RamString;
 
   static AdaptedString adapt(const T& s) {
     return AdaptedString(get_data(s), get_size(s));
diff --git a/lib/ArduinoJson/src/ArduinoJson/Strings/IsString.hpp b/lib/ArduinoJson/src/ArduinoJson/Strings/IsString.hpp
index 45ef7995..a71655db 100644
--- a/lib/ArduinoJson/src/ArduinoJson/Strings/IsString.hpp
+++ b/lib/ArduinoJson/src/ArduinoJson/Strings/IsString.hpp
@@ -13,7 +13,7 @@ template <typename T, typename Enable = void>
 struct IsString : false_type {};
 
 template <typename T>
-struct IsString<T, void_t<typename StringAdapter<T>::AdaptedString>>
+struct IsString<T, void_t<typename StringAdapterFor<T>::AdaptedString>>
     : true_type {};
 
 ARDUINOJSON_END_PRIVATE_NAMESPACE
diff --git a/lib/ArduinoJson/src/ArduinoJson/Strings/JsonString.hpp b/lib/ArduinoJson/src/ArduinoJson/Strings/JsonString.hpp
index 2ecb697b..76011da9 100644
--- a/lib/ArduinoJson/src/ArduinoJson/Strings/JsonString.hpp
+++ b/lib/ArduinoJson/src/ArduinoJson/Strings/JsonString.hpp
@@ -4,6 +4,9 @@
 
 #pragma once
 
+#include <ArduinoJson/Polyfills/type_traits.hpp>
+#include <ArduinoJson/Strings/Adapters/RamString.hpp>
+
 #if ARDUINOJSON_ENABLE_STD_STREAM
 #  include <ostream>
 #endif
@@ -13,54 +16,58 @@ ARDUINOJSON_BEGIN_PUBLIC_NAMESPACE
 // A string.
 // https://arduinojson.org/v7/api/jsonstring/
 class JsonString {
- public:
-  enum Ownership { Copied, Linked };
+  friend struct detail::StringAdapter<JsonString>;
 
-  JsonString() : data_(0), size_(0), ownership_(Linked) {}
+ public:
+  JsonString() : str_(nullptr, 0, true) {}
 
-  JsonString(const char* data, Ownership ownership = Linked)
-      : data_(data), size_(data ? ::strlen(data) : 0), ownership_(ownership) {}
+  JsonString(const char* data, bool isStatic = false)
+      : str_(data, data ? ::strlen(data) : 0, isStatic) {}
 
-  JsonString(const char* data, size_t sz, Ownership ownership = Linked)
-      : data_(data), size_(sz), ownership_(ownership) {}
+  template <typename TSize,
+            detail::enable_if_t<detail::is_integral<TSize>::value &&
+                                    !detail::is_same<TSize, bool>::value,
+                                int> = 0>
+  JsonString(const char* data, TSize sz, bool isStatic = false)
+      : str_(data, size_t(sz), isStatic) {}
 
   // Returns a pointer to the characters.
   const char* c_str() const {
-    return data_;
+    return str_.data();
   }
 
   // Returns true if the string is null.
   bool isNull() const {
-    return !data_;
+    return str_.isNull();
   }
 
   // Returns true if the string is stored by address.
   // Returns false if the string is stored by copy.
-  bool isLinked() const {
-    return ownership_ == Linked;
+  bool isStatic() const {
+    return str_.isStatic();
   }
 
   // Returns length of the string.
   size_t size() const {
-    return size_;
+    return str_.size();
   }
 
   // Returns true if the string is non-null
   explicit operator bool() const {
-    return data_ != 0;
+    return str_.data() != 0;
   }
 
   // Returns true if strings are equal.
   friend bool operator==(JsonString lhs, JsonString rhs) {
-    if (lhs.size_ != rhs.size_)
+    if (lhs.size() != rhs.size())
       return false;
-    if (lhs.data_ == rhs.data_)
+    if (lhs.c_str() == rhs.c_str())
       return true;
-    if (!lhs.data_)
+    if (!lhs.c_str())
       return false;
-    if (!rhs.data_)
+    if (!rhs.c_str())
       return false;
-    return memcmp(lhs.data_, rhs.data_, lhs.size_) == 0;
+    return memcmp(lhs.c_str(), rhs.c_str(), lhs.size()) == 0;
   }
 
   // Returns true if strings differs.
@@ -76,9 +83,18 @@ class JsonString {
 #endif
 
  private:
-  const char* data_;
-  size_t size_;
-  Ownership ownership_;
+  detail::RamString str_;
+};
+
+namespace detail {
+template <>
+struct StringAdapter<JsonString> {
+  using AdaptedString = RamString;
+
+  static const AdaptedString& adapt(const JsonString& s) {
+    return s.str_;
+  }
 };
+}  // namespace detail
 
 ARDUINOJSON_END_PUBLIC_NAMESPACE
diff --git a/lib/ArduinoJson/src/ArduinoJson/Strings/StringAdapter.hpp b/lib/ArduinoJson/src/ArduinoJson/Strings/StringAdapter.hpp
index 9cf2e6fd..cd19e41b 100644
--- a/lib/ArduinoJson/src/ArduinoJson/Strings/StringAdapter.hpp
+++ b/lib/ArduinoJson/src/ArduinoJson/Strings/StringAdapter.hpp
@@ -4,8 +4,17 @@
 
 #pragma once
 
+#include <ArduinoJson/Polyfills/utility.hpp>
+
 ARDUINOJSON_BEGIN_PRIVATE_NAMESPACE
 
+// a meta function that tells if the type is a string literal (const char[N])
+template <typename T>
+struct IsStringLiteral : false_type {};
+
+template <size_t N>
+struct IsStringLiteral<const char (&)[N]> : true_type {};
+
 template <typename TString, typename Enable = void>
 struct StringAdapter;
 
@@ -13,18 +22,25 @@ template <typename TString, typename Enable = void>
 struct SizedStringAdapter;
 
 template <typename TString>
-typename StringAdapter<TString>::AdaptedString adaptString(const TString& s) {
-  return StringAdapter<TString>::adapt(s);
+using StringAdapterFor =
+    StringAdapter<conditional_t<IsStringLiteral<TString>::value, TString,
+                                remove_cv_t<remove_reference_t<TString>>>>;
+
+template <typename T>
+using AdaptedString = typename StringAdapterFor<T>::AdaptedString;
+
+template <typename TString>
+AdaptedString<TString> adaptString(TString&& s) {
+  return StringAdapterFor<TString>::adapt(detail::forward<TString>(s));
 }
 
-template <typename TChar>
-typename StringAdapter<TChar*>::AdaptedString adaptString(TChar* p) {
+template <typename TChar, enable_if_t<!is_const<TChar>::value, int> = 0>
+AdaptedString<TChar*> adaptString(TChar* p) {
   return StringAdapter<TChar*>::adapt(p);
 }
 
 template <typename TChar>
-typename SizedStringAdapter<TChar*>::AdaptedString adaptString(TChar* p,
-                                                               size_t n) {
+AdaptedString<TChar*> adaptString(TChar* p, size_t n) {
   return SizedStringAdapter<TChar*>::adapt(p, n);
 }
 
diff --git a/lib/ArduinoJson/src/ArduinoJson/Strings/StringAdapters.hpp b/lib/ArduinoJson/src/ArduinoJson/Strings/StringAdapters.hpp
index 5da554ce..e8ff181e 100644
--- a/lib/ArduinoJson/src/ArduinoJson/Strings/StringAdapters.hpp
+++ b/lib/ArduinoJson/src/ArduinoJson/Strings/StringAdapters.hpp
@@ -5,7 +5,6 @@
 #pragma once
 
 #include <ArduinoJson/Polyfills/type_traits.hpp>
-#include <ArduinoJson/Strings/Adapters/JsonString.hpp>
 #include <ArduinoJson/Strings/Adapters/RamString.hpp>
 #include <ArduinoJson/Strings/Adapters/StringObject.hpp>
 
diff --git a/lib/ArduinoJson/src/ArduinoJson/Variant/ConverterImpl.hpp b/lib/ArduinoJson/src/ArduinoJson/Variant/ConverterImpl.hpp
index cd939595..296bf55f 100644
--- a/lib/ArduinoJson/src/ArduinoJson/Variant/ConverterImpl.hpp
+++ b/lib/ArduinoJson/src/ArduinoJson/Variant/ConverterImpl.hpp
@@ -31,7 +31,7 @@ struct Converter {
     // clang-format on
   }
 
-  static T fromJson(JsonVariantConst src) {
+  static detail::decay_t<T> fromJson(JsonVariantConst src) {
     static_assert(!detail::is_same<T, char*>::value,
                   "type 'char*' is not supported, use 'const char*' instead");
 
@@ -178,7 +178,7 @@ struct Converter<JsonString> : private detail::VariantAttorney {
 
   static JsonString fromJson(JsonVariantConst src) {
     auto data = getData(src);
-    return data ? data->asString() : 0;
+    return data ? data->asString() : JsonString();
   }
 
   static bool checkJson(JsonVariantConst src) {
diff --git a/lib/ArduinoJson/src/ArduinoJson/Variant/JsonVariantConst.hpp b/lib/ArduinoJson/src/ArduinoJson/Variant/JsonVariantConst.hpp
index 4389bb8c..b1eb66e0 100644
--- a/lib/ArduinoJson/src/ArduinoJson/Variant/JsonVariantConst.hpp
+++ b/lib/ArduinoJson/src/ArduinoJson/Variant/JsonVariantConst.hpp
@@ -68,27 +68,29 @@ class JsonVariantConst : public detail::VariantTag,
   // Casts the value to the specified type.
   // https://arduinojson.org/v7/api/jsonvariantconst/as/
   template <typename T,
-            detail::enable_if_t<ConversionSupported<T>::value, bool> = true>
+            detail::enable_if_t<ConversionSupported<T>::value, int> = 0>
   T as() const {
     return Converter<T>::fromJson(*this);
   }
 
   // Invalid conversion. Will not compile.
   template <typename T,
-            detail::enable_if_t<!ConversionSupported<T>::value, bool> = true>
+            detail::enable_if_t<!ConversionSupported<T>::value, int> = 0>
   detail::InvalidConversion<JsonVariantConst, T> as() const;
 
   // Returns true if the value is of the specified type.
   // https://arduinojson.org/v7/api/jsonvariantconst/is/
-  template <typename T>
-  detail::enable_if_t<ConversionSupported<T>::value, bool> is() const {
+  template <typename T,
+            detail::enable_if_t<ConversionSupported<T>::value, int> = 0>
+  bool is() const {
     return Converter<T>::checkJson(*this);
   }
 
   // Always returns false for the unsupported types.
   // https://arduinojson.org/v7/api/jsonvariantconst/is/
-  template <typename T>
-  detail::enable_if_t<!ConversionSupported<T>::value, bool> is() const {
+  template <typename T,
+            detail::enable_if_t<!ConversionSupported<T>::value, int> = 0>
+  bool is() const {
     return false;
   }
 
@@ -99,9 +101,9 @@ class JsonVariantConst : public detail::VariantTag,
 
   // Gets array's element at specified index.
   // https://arduinojson.org/v7/api/jsonvariantconst/subscript/
-  template <typename T>
-  detail::enable_if_t<detail::is_integral<T>::value, JsonVariantConst>
-  operator[](T index) const {
+  template <typename T,
+            detail::enable_if_t<detail::is_integral<T>::value, int> = 0>
+  JsonVariantConst operator[](T index) const {
     return JsonVariantConst(
         detail::VariantData::getElement(data_, size_t(index), resources_),
         resources_);
@@ -109,9 +111,9 @@ class JsonVariantConst : public detail::VariantTag,
 
   // Gets object's member with specified key.
   // https://arduinojson.org/v7/api/jsonvariantconst/subscript/
-  template <typename TString>
-  detail::enable_if_t<detail::IsString<TString>::value, JsonVariantConst>
-  operator[](const TString& key) const {
+  template <typename TString,
+            detail::enable_if_t<detail::IsString<TString>::value, int> = 0>
+  JsonVariantConst operator[](const TString& key) const {
     return JsonVariantConst(detail::VariantData::getMember(
                                 data_, detail::adaptString(key), resources_),
                             resources_);
@@ -119,9 +121,11 @@ class JsonVariantConst : public detail::VariantTag,
 
   // Gets object's member with specified key.
   // https://arduinojson.org/v7/api/jsonvariantconst/subscript/
-  template <typename TChar>
-  detail::enable_if_t<detail::IsString<TChar*>::value, JsonVariantConst>
-  operator[](TChar* key) const {
+  template <typename TChar,
+            detail::enable_if_t<detail::IsString<TChar*>::value &&
+                                    !detail::is_const<TChar>::value,
+                                int> = 0>
+  JsonVariantConst operator[](TChar* key) const {
     return JsonVariantConst(detail::VariantData::getMember(
                                 data_, detail::adaptString(key), resources_),
                             resources_);
@@ -130,9 +134,9 @@ class JsonVariantConst : public detail::VariantTag,
   // Gets object's member with specified key or the array's element at the
   // specified index.
   // https://arduinojson.org/v7/api/jsonvariantconst/subscript/
-  template <typename TVariant>
-  detail::enable_if_t<detail::IsVariant<TVariant>::value, JsonVariantConst>
-  operator[](const TVariant& key) const {
+  template <typename TVariant,
+            detail::enable_if_t<detail::IsVariant<TVariant>::value, int> = 0>
+  JsonVariantConst operator[](const TVariant& key) const {
     if (key.template is<size_t>())
       return operator[](key.template as<size_t>());
     else
@@ -141,30 +145,32 @@ class JsonVariantConst : public detail::VariantTag,
 
   // DEPRECATED: use obj[key].is<T>() instead
   // https://arduinojson.org/v7/api/jsonvariantconst/containskey/
-  template <typename TString>
+  template <typename TString,
+            detail::enable_if_t<detail::IsString<TString>::value, int> = 0>
   ARDUINOJSON_DEPRECATED("use var[key].is<T>() instead")
-  detail::enable_if_t<detail::IsString<TString>::value, bool> containsKey(
-      const TString& key) const {
+  bool containsKey(const TString& key) const {
     return detail::VariantData::getMember(getData(), detail::adaptString(key),
                                           resources_) != 0;
   }
 
   // DEPRECATED: use obj["key"].is<T>() instead
   // https://arduinojson.org/v7/api/jsonvariantconst/containskey/
-  template <typename TChar>
+  template <typename TChar,
+            detail::enable_if_t<detail::IsString<TChar*>::value &&
+                                    !detail::is_const<TChar>::value,
+                                int> = 0>
   ARDUINOJSON_DEPRECATED("use obj[\"key\"].is<T>() instead")
-  detail::enable_if_t<detail::IsString<TChar*>::value, bool> containsKey(
-      TChar* key) const {
+  bool containsKey(TChar* key) const {
     return detail::VariantData::getMember(getData(), detail::adaptString(key),
                                           resources_) != 0;
   }
 
   // DEPRECATED: use obj[key].is<T>() instead
   // https://arduinojson.org/v7/api/jsonvariantconst/containskey/
-  template <typename TVariant>
+  template <typename TVariant,
+            detail::enable_if_t<detail::IsVariant<TVariant>::value, int> = 0>
   ARDUINOJSON_DEPRECATED("use var[key].is<T>() instead")
-  detail::enable_if_t<detail::IsVariant<TVariant>::value, bool> containsKey(
-      const TVariant& key) const {
+  bool containsKey(const TVariant& key) const {
     return containsKey(key.template as<const char*>());
   }
 
diff --git a/lib/ArduinoJson/src/ArduinoJson/Variant/VariantData.hpp b/lib/ArduinoJson/src/ArduinoJson/Variant/VariantData.hpp
index 43ee4d80..ba1bef8a 100644
--- a/lib/ArduinoJson/src/ArduinoJson/Variant/VariantData.hpp
+++ b/lib/ArduinoJson/src/ArduinoJson/Variant/VariantData.hpp
@@ -64,12 +64,11 @@ class VariantData {
         return visit.visit(content_.asObject);
 
       case VariantType::LinkedString:
-        return visit.visit(JsonString(content_.asLinkedString));
+        return visit.visit(JsonString(content_.asLinkedString, true));
 
       case VariantType::OwnedString:
         return visit.visit(JsonString(content_.asOwnedString->data,
-                                      content_.asOwnedString->length,
-                                      JsonString::Copied));
+                                      content_.asOwnedString->length));
 
       case VariantType::RawString:
         return visit.visit(RawString(content_.asOwnedString->data,
@@ -119,14 +118,13 @@ class VariantData {
   }
 
   template <typename T>
-  bool addValue(T&& value, ResourceManager* resources) {
+  bool addValue(const T& value, ResourceManager* resources) {
     auto array = isNull() ? &toArray() : asArray();
-    return detail::ArrayData::addValue(array, detail::forward<T>(value),
-                                       resources);
+    return detail::ArrayData::addValue(array, value, resources);
   }
 
   template <typename T>
-  static bool addValue(VariantData* var, T&& value,
+  static bool addValue(VariantData* var, const T& value,
                        ResourceManager* resources) {
     if (!var)
       return false;
@@ -262,7 +260,7 @@ class VariantData {
     switch (type_) {
       case VariantType::RawString:
         return JsonString(content_.asOwnedString->data,
-                          content_.asOwnedString->length, JsonString::Copied);
+                          content_.asOwnedString->length);
       default:
         return JsonString();
     }
@@ -271,10 +269,10 @@ class VariantData {
   JsonString asString() const {
     switch (type_) {
       case VariantType::LinkedString:
-        return JsonString(content_.asLinkedString, JsonString::Linked);
+        return JsonString(content_.asLinkedString, true);
       case VariantType::OwnedString:
         return JsonString(content_.asOwnedString->data,
-                          content_.asOwnedString->length, JsonString::Copied);
+                          content_.asOwnedString->length);
       default:
         return JsonString();
     }
diff --git a/lib/ArduinoJson/src/ArduinoJson/Variant/VariantImpl.hpp b/lib/ArduinoJson/src/ArduinoJson/Variant/VariantImpl.hpp
index f6217d77..8e5b2539 100644
--- a/lib/ArduinoJson/src/ArduinoJson/Variant/VariantImpl.hpp
+++ b/lib/ArduinoJson/src/ArduinoJson/Variant/VariantImpl.hpp
@@ -26,7 +26,7 @@ inline bool VariantData::setString(TAdaptedString value,
   if (value.isNull())
     return false;
 
-  if (value.isLinked()) {
+  if (value.isStatic()) {
     setLinkedString(value.data());
     return true;
   }
diff --git a/lib/ArduinoJson/src/ArduinoJson/Variant/VariantOperators.hpp b/lib/ArduinoJson/src/ArduinoJson/Variant/VariantOperators.hpp
index b06d46f6..d17e7cb4 100644
--- a/lib/ArduinoJson/src/ArduinoJson/Variant/VariantOperators.hpp
+++ b/lib/ArduinoJson/src/ArduinoJson/Variant/VariantOperators.hpp
@@ -30,9 +30,9 @@ struct VariantOperators : VariantOperatorTag {
   // int operator|(JsonVariant, int)
   // float operator|(JsonVariant, float)
   // bool operator|(JsonVariant, bool)
-  template <typename T>
-  friend enable_if_t<!IsVariant<T>::value && !is_array<T>::value, T> operator|(
-      const TVariant& variant, const T& defaultValue) {
+  template <typename T,
+            enable_if_t<!IsVariant<T>::value && !is_array<T>::value, int> = 0>
+  friend T operator|(const TVariant& variant, const T& defaultValue) {
     if (variant.template is<T>())
       return variant.template as<T>();
     else
@@ -51,7 +51,7 @@ struct VariantOperators : VariantOperatorTag {
   // JsonVariant operator|(JsonVariant, JsonVariant)
   template <typename T>
   friend enable_if_t<IsVariant<T>::value, JsonVariantConst> operator|(
-      const TVariant& variant, T defaultValue) {
+      const TVariant& variant, const T& defaultValue) {
     if (variant)
       return variant;
     else
@@ -60,127 +60,127 @@ struct VariantOperators : VariantOperatorTag {
 
   // value == TVariant
   template <typename T>
-  friend bool operator==(T* lhs, TVariant rhs) {
+  friend bool operator==(T* lhs, const TVariant& rhs) {
     return compare(rhs, lhs) == COMPARE_RESULT_EQUAL;
   }
   template <typename T>
-  friend bool operator==(const T& lhs, TVariant rhs) {
+  friend bool operator==(const T& lhs, const TVariant& rhs) {
     return compare(rhs, lhs) == COMPARE_RESULT_EQUAL;
   }
 
   // TVariant == value
   template <typename T>
-  friend bool operator==(TVariant lhs, T* rhs) {
+  friend bool operator==(const TVariant& lhs, T* rhs) {
     return compare(lhs, rhs) == COMPARE_RESULT_EQUAL;
   }
-  template <typename T>
-  friend enable_if_t<!is_base_of<VariantOperatorTag, T>::value, bool>
-  operator==(TVariant lhs, const T& rhs) {
+  template <typename T,
+            enable_if_t<!is_base_of<VariantOperatorTag, T>::value, int> = 0>
+  friend bool operator==(const TVariant& lhs, const T& rhs) {
     return compare(lhs, rhs) == COMPARE_RESULT_EQUAL;
   }
 
   // value != TVariant
   template <typename T>
-  friend bool operator!=(T* lhs, TVariant rhs) {
+  friend bool operator!=(T* lhs, const TVariant& rhs) {
     return compare(rhs, lhs) != COMPARE_RESULT_EQUAL;
   }
   template <typename T>
-  friend bool operator!=(const T& lhs, TVariant rhs) {
+  friend bool operator!=(const T& lhs, const TVariant& rhs) {
     return compare(rhs, lhs) != COMPARE_RESULT_EQUAL;
   }
 
   // TVariant != value
   template <typename T>
-  friend bool operator!=(TVariant lhs, T* rhs) {
+  friend bool operator!=(const TVariant& lhs, T* rhs) {
     return compare(lhs, rhs) != COMPARE_RESULT_EQUAL;
   }
-  template <typename T>
-  friend enable_if_t<!is_base_of<VariantOperatorTag, T>::value, bool>
-  operator!=(TVariant lhs, const T& rhs) {
+  template <typename T,
+            enable_if_t<!is_base_of<VariantOperatorTag, T>::value, int> = 0>
+  friend bool operator!=(TVariant lhs, const T& rhs) {
     return compare(lhs, rhs) != COMPARE_RESULT_EQUAL;
   }
 
   // value < TVariant
   template <typename T>
-  friend bool operator<(T* lhs, TVariant rhs) {
+  friend bool operator<(T* lhs, const TVariant& rhs) {
     return compare(rhs, lhs) == COMPARE_RESULT_GREATER;
   }
   template <typename T>
-  friend bool operator<(const T& lhs, TVariant rhs) {
+  friend bool operator<(const T& lhs, const TVariant& rhs) {
     return compare(rhs, lhs) == COMPARE_RESULT_GREATER;
   }
 
   // TVariant < value
   template <typename T>
-  friend bool operator<(TVariant lhs, T* rhs) {
+  friend bool operator<(const TVariant& lhs, T* rhs) {
     return compare(lhs, rhs) == COMPARE_RESULT_LESS;
   }
-  template <typename T>
-  friend enable_if_t<!is_base_of<VariantOperatorTag, T>::value, bool> operator<(
-      TVariant lhs, const T& rhs) {
+  template <typename T,
+            enable_if_t<!is_base_of<VariantOperatorTag, T>::value, int> = 0>
+  friend bool operator<(TVariant lhs, const T& rhs) {
     return compare(lhs, rhs) == COMPARE_RESULT_LESS;
   }
 
   // value <= TVariant
   template <typename T>
-  friend bool operator<=(T* lhs, TVariant rhs) {
+  friend bool operator<=(T* lhs, const TVariant& rhs) {
     return (compare(rhs, lhs) & COMPARE_RESULT_GREATER_OR_EQUAL) != 0;
   }
   template <typename T>
-  friend bool operator<=(const T& lhs, TVariant rhs) {
+  friend bool operator<=(const T& lhs, const TVariant& rhs) {
     return (compare(rhs, lhs) & COMPARE_RESULT_GREATER_OR_EQUAL) != 0;
   }
 
   // TVariant <= value
   template <typename T>
-  friend bool operator<=(TVariant lhs, T* rhs) {
+  friend bool operator<=(const TVariant& lhs, T* rhs) {
     return (compare(lhs, rhs) & COMPARE_RESULT_LESS_OR_EQUAL) != 0;
   }
-  template <typename T>
-  friend enable_if_t<!is_base_of<VariantOperatorTag, T>::value, bool>
-  operator<=(TVariant lhs, const T& rhs) {
+  template <typename T,
+            enable_if_t<!is_base_of<VariantOperatorTag, T>::value, int> = 0>
+  friend bool operator<=(TVariant lhs, const T& rhs) {
     return (compare(lhs, rhs) & COMPARE_RESULT_LESS_OR_EQUAL) != 0;
   }
 
   // value > TVariant
   template <typename T>
-  friend bool operator>(T* lhs, TVariant rhs) {
+  friend bool operator>(T* lhs, const TVariant& rhs) {
     return compare(rhs, lhs) == COMPARE_RESULT_LESS;
   }
   template <typename T>
-  friend bool operator>(const T& lhs, TVariant rhs) {
+  friend bool operator>(const T& lhs, const TVariant& rhs) {
     return compare(rhs, lhs) == COMPARE_RESULT_LESS;
   }
 
   // TVariant > value
   template <typename T>
-  friend bool operator>(TVariant lhs, T* rhs) {
+  friend bool operator>(const TVariant& lhs, T* rhs) {
     return compare(lhs, rhs) == COMPARE_RESULT_GREATER;
   }
-  template <typename T>
-  friend enable_if_t<!is_base_of<VariantOperatorTag, T>::value, bool> operator>(
-      TVariant lhs, const T& rhs) {
+  template <typename T,
+            enable_if_t<!is_base_of<VariantOperatorTag, T>::value, int> = 0>
+  friend bool operator>(TVariant lhs, const T& rhs) {
     return compare(lhs, rhs) == COMPARE_RESULT_GREATER;
   }
 
   // value >= TVariant
   template <typename T>
-  friend bool operator>=(T* lhs, TVariant rhs) {
+  friend bool operator>=(T* lhs, const TVariant& rhs) {
     return (compare(rhs, lhs) & COMPARE_RESULT_LESS_OR_EQUAL) != 0;
   }
   template <typename T>
-  friend bool operator>=(const T& lhs, TVariant rhs) {
+  friend bool operator>=(const T& lhs, const TVariant& rhs) {
     return (compare(rhs, lhs) & COMPARE_RESULT_LESS_OR_EQUAL) != 0;
   }
 
   // TVariant >= value
   template <typename T>
-  friend bool operator>=(TVariant lhs, T* rhs) {
+  friend bool operator>=(const TVariant& lhs, T* rhs) {
     return (compare(lhs, rhs) & COMPARE_RESULT_GREATER_OR_EQUAL) != 0;
   }
-  template <typename T>
-  friend enable_if_t<!is_base_of<VariantOperatorTag, T>::value, bool>
-  operator>=(TVariant lhs, const T& rhs) {
+  template <typename T,
+            enable_if_t<!is_base_of<VariantOperatorTag, T>::value, int> = 0>
+  friend bool operator>=(const TVariant& lhs, const T& rhs) {
     return (compare(lhs, rhs) & COMPARE_RESULT_GREATER_OR_EQUAL) != 0;
   }
 };
diff --git a/lib/ArduinoJson/src/ArduinoJson/Variant/VariantRefBase.hpp b/lib/ArduinoJson/src/ArduinoJson/Variant/VariantRefBase.hpp
index d8f5cfcb..544fe42c 100644
--- a/lib/ArduinoJson/src/ArduinoJson/Variant/VariantRefBase.hpp
+++ b/lib/ArduinoJson/src/ArduinoJson/Variant/VariantRefBase.hpp
@@ -48,25 +48,25 @@ class VariantRefBase : public VariantTag {
   template <typename T>
   T as() const;
 
-  template <typename T, typename = enable_if_t<!is_same<T, TDerived>::value>>
+  template <typename T, enable_if_t<!is_same<T, TDerived>::value, int> = 0>
   operator T() const {
     return as<T>();
   }
 
   // Sets the value to an empty array.
   // https://arduinojson.org/v7/api/jsonvariant/to/
-  template <typename T>
-  enable_if_t<is_same<T, JsonArray>::value, JsonArray> to() const;
+  template <typename T, enable_if_t<is_same<T, JsonArray>::value, int> = 0>
+  JsonArray to() const;
 
   // Sets the value to an empty object.
   // https://arduinojson.org/v7/api/jsonvariant/to/
-  template <typename T>
-  enable_if_t<is_same<T, JsonObject>::value, JsonObject> to() const;
+  template <typename T, enable_if_t<is_same<T, JsonObject>::value, int> = 0>
+  JsonObject to() const;
 
   // Sets the value to null.
   // https://arduinojson.org/v7/api/jsonvariant/to/
-  template <typename T>
-  enable_if_t<is_same<T, JsonVariant>::value, JsonVariant> to() const;
+  template <typename T, enable_if_t<is_same<T, JsonVariant>::value, int> = 0>
+  JsonVariant to() const;
 
   // Returns true if the value is of the specified type.
   // https://arduinojson.org/v7/api/jsonvariant/is/
@@ -77,12 +77,15 @@ class VariantRefBase : public VariantTag {
   // https://arduinojson.org/v7/api/jsonvariant/set/
   template <typename T>
   bool set(const T& value) const {
-    return doSet<Converter<remove_cv_t<T>>>(value);
+    using TypeForConverter = conditional_t<IsStringLiteral<T>::value, T,
+                                           remove_cv_t<remove_reference_t<T>>>;
+    return doSet<Converter<TypeForConverter>>(value);
   }
 
   // Copies the specified value.
   // https://arduinojson.org/v7/api/jsonvariant/set/
-  template <typename T>
+  template <typename T,
+            detail::enable_if_t<!detail::is_const<T>::value, int> = 0>
   bool set(T* value) const {
     return doSet<Converter<T*>>(value);
   }
@@ -102,16 +105,16 @@ class VariantRefBase : public VariantTag {
   // Appends a new (empty) element to the array.
   // Returns a reference to the new element.
   // https://arduinojson.org/v7/api/jsonvariant/add/
-  template <typename T>
-  enable_if_t<!is_same<T, JsonVariant>::value, T> add() const {
+  template <typename T, enable_if_t<!is_same<T, JsonVariant>::value, int> = 0>
+  T add() const {
     return add<JsonVariant>().template to<T>();
   }
 
   // Appends a new (null) element to the array.
   // Returns a reference to the new element.
   // https://arduinojson.org/v7/api/jsonvariant/add/
-  template <typename T>
-  enable_if_t<is_same<T, JsonVariant>::value, T> add() const;
+  template <typename T, enable_if_t<is_same<T, JsonVariant>::value, int> = 0>
+  T add() const;
 
   // Appends a value to the array.
   // https://arduinojson.org/v7/api/jsonvariant/add/
@@ -123,7 +126,7 @@ class VariantRefBase : public VariantTag {
 
   // Appends a value to the array.
   // https://arduinojson.org/v7/api/jsonvariant/add/
-  template <typename T>
+  template <typename T, enable_if_t<!is_const<T>::value, int> = 0>
   bool add(T* value) const {
     return detail::VariantData::addValue(getOrCreateData(), value,
                                          getResourceManager());
@@ -137,24 +140,24 @@ class VariantRefBase : public VariantTag {
 
   // Removes a member of the object.
   // https://arduinojson.org/v7/api/jsonvariant/remove/
-  template <typename TChar>
-  enable_if_t<IsString<TChar*>::value> remove(TChar* key) const {
+  template <typename TChar, enable_if_t<IsString<TChar*>::value, int> = 0>
+  void remove(TChar* key) const {
     VariantData::removeMember(getData(), adaptString(key),
                               getResourceManager());
   }
 
   // Removes a member of the object.
   // https://arduinojson.org/v7/api/jsonvariant/remove/
-  template <typename TString>
-  enable_if_t<IsString<TString>::value> remove(const TString& key) const {
+  template <typename TString, enable_if_t<IsString<TString>::value, int> = 0>
+  void remove(const TString& key) const {
     VariantData::removeMember(getData(), adaptString(key),
                               getResourceManager());
   }
 
   // Removes a member of the object or an element of the array.
   // https://arduinojson.org/v7/api/jsonvariant/remove/
-  template <typename TVariant>
-  enable_if_t<IsVariant<TVariant>::value> remove(const TVariant& key) const {
+  template <typename TVariant, enable_if_t<IsVariant<TVariant>::value, int> = 0>
+  void remove(const TVariant& key) const {
     if (key.template is<size_t>())
       remove(key.template as<size_t>());
     else
@@ -167,43 +170,40 @@ class VariantRefBase : public VariantTag {
 
   // DEPRECATED: use obj[key].is<T>() instead
   // https://arduinojson.org/v7/api/jsonvariant/containskey/
-  template <typename TString>
+  template <typename TString, enable_if_t<IsString<TString>::value, int> = 0>
   ARDUINOJSON_DEPRECATED("use obj[key].is<T>() instead")
-  enable_if_t<IsString<TString>::value, bool> containsKey(
-      const TString& key) const;
+  bool containsKey(const TString& key) const;
 
   // DEPRECATED: use obj["key"].is<T>() instead
   // https://arduinojson.org/v7/api/jsonvariant/containskey/
-  template <typename TChar>
+  template <typename TChar, enable_if_t<IsString<TChar*>::value, int> = 0>
   ARDUINOJSON_DEPRECATED("use obj[\"key\"].is<T>() instead")
-  enable_if_t<IsString<TChar*>::value, bool> containsKey(TChar* key) const;
+  bool containsKey(TChar* key) const;
 
   // DEPRECATED: use obj[key].is<T>() instead
   // https://arduinojson.org/v7/api/jsonvariant/containskey/
-  template <typename TVariant>
+  template <typename TVariant, enable_if_t<IsVariant<TVariant>::value, int> = 0>
   ARDUINOJSON_DEPRECATED("use obj[key].is<T>() instead")
-  enable_if_t<IsVariant<TVariant>::value, bool> containsKey(
-      const TVariant& key) const;
+  bool containsKey(const TVariant& key) const;
 
   // Gets or sets an object member.
   // https://arduinojson.org/v7/api/jsonvariant/subscript/
-  template <typename TString>
-  FORCE_INLINE
-      enable_if_t<IsString<TString>::value, MemberProxy<TDerived, TString>>
-      operator[](const TString& key) const;
+  template <typename TString, enable_if_t<IsString<TString>::value, int> = 0>
+  FORCE_INLINE MemberProxy<TDerived, AdaptedString<TString>> operator[](
+      const TString& key) const;
 
   // Gets or sets an object member.
   // https://arduinojson.org/v7/api/jsonvariant/subscript/
-  template <typename TChar>
-  FORCE_INLINE
-      enable_if_t<IsString<TChar*>::value, MemberProxy<TDerived, TChar*>>
-      operator[](TChar* key) const;
+  template <
+      typename TChar,
+      enable_if_t<IsString<TChar*>::value && !is_const<TChar>::value, int> = 0>
+  FORCE_INLINE MemberProxy<TDerived, AdaptedString<TChar*>> operator[](
+      TChar* key) const;
 
   // Gets an object member or an array element.
   // https://arduinojson.org/v7/api/jsonvariant/subscript/
-  template <typename TVariant>
-  enable_if_t<IsVariant<TVariant>::value, JsonVariantConst> operator[](
-      const TVariant& key) const {
+  template <typename TVariant, enable_if_t<IsVariant<TVariant>::value, int> = 0>
+  JsonVariantConst operator[](const TVariant& key) const {
     if (key.template is<size_t>())
       return operator[](key.template as<size_t>());
     else
@@ -294,19 +294,18 @@ class VariantRefBase : public VariantTag {
   }
 
   template <typename TConverter, typename T>
-  bool doSet(T&& value) const {
+  bool doSet(const T& value) const {
     return doSet<TConverter>(
-        detail::forward<T>(value),
-        is_same<typename function_traits<
-                    decltype(&TConverter::toJson)>::return_type,
-                bool>{});
+        value, is_same<typename function_traits<
+                           decltype(&TConverter::toJson)>::return_type,
+                       bool>{});
   }
 
   template <typename TConverter, typename T>
-  bool doSet(T&& value, false_type) const;
+  bool doSet(const T& value, false_type) const;
 
   template <typename TConverter, typename T>
-  bool doSet(T&& value, true_type) const;
+  bool doSet(const T& value, true_type) const;
 
   ArduinoJson::JsonVariant getOrCreateVariant() const;
 };
diff --git a/lib/ArduinoJson/src/ArduinoJson/Variant/VariantRefBaseImpl.hpp b/lib/ArduinoJson/src/ArduinoJson/Variant/VariantRefBaseImpl.hpp
index 594f317d..1c87cc11 100644
--- a/lib/ArduinoJson/src/ArduinoJson/Variant/VariantRefBaseImpl.hpp
+++ b/lib/ArduinoJson/src/ArduinoJson/Variant/VariantRefBaseImpl.hpp
@@ -67,34 +67,30 @@ inline void convertToJson(const VariantRefBase<TDerived>& src,
 }
 
 template <typename TDerived>
-template <typename T>
-inline enable_if_t<is_same<T, JsonVariant>::value, T>
-VariantRefBase<TDerived>::add() const {
+template <typename T, enable_if_t<is_same<T, JsonVariant>::value, int>>
+inline T VariantRefBase<TDerived>::add() const {
   return JsonVariant(
       detail::VariantData::addElement(getOrCreateData(), getResourceManager()),
       getResourceManager());
 }
 
 template <typename TDerived>
-template <typename TString>
-inline enable_if_t<IsString<TString>::value, bool>
-VariantRefBase<TDerived>::containsKey(const TString& key) const {
+template <typename TString, enable_if_t<IsString<TString>::value, int>>
+inline bool VariantRefBase<TDerived>::containsKey(const TString& key) const {
   return VariantData::getMember(getData(), adaptString(key),
                                 getResourceManager()) != 0;
 }
 
 template <typename TDerived>
-template <typename TChar>
-inline enable_if_t<IsString<TChar*>::value, bool>
-VariantRefBase<TDerived>::containsKey(TChar* key) const {
+template <typename TChar, enable_if_t<IsString<TChar*>::value, int>>
+inline bool VariantRefBase<TDerived>::containsKey(TChar* key) const {
   return VariantData::getMember(getData(), adaptString(key),
                                 getResourceManager()) != 0;
 }
 
 template <typename TDerived>
-template <typename TVariant>
-inline enable_if_t<IsVariant<TVariant>::value, bool>
-VariantRefBase<TDerived>::containsKey(const TVariant& key) const {
+template <typename TVariant, enable_if_t<IsVariant<TVariant>::value, int>>
+inline bool VariantRefBase<TDerived>::containsKey(const TVariant& key) const {
   return containsKey(key.template as<const char*>());
 }
 
@@ -119,26 +115,27 @@ inline bool VariantRefBase<TDerived>::is() const {
 template <typename TDerived>
 inline ElementProxy<TDerived> VariantRefBase<TDerived>::operator[](
     size_t index) const {
-  return ElementProxy<TDerived>(derived(), index);
+  return {derived(), index};
 }
 
 template <typename TDerived>
-template <typename TString>
-inline enable_if_t<IsString<TString*>::value, MemberProxy<TDerived, TString*>>
-VariantRefBase<TDerived>::operator[](TString* key) const {
-  return MemberProxy<TDerived, TString*>(derived(), key);
+template <typename TChar,
+          enable_if_t<IsString<TChar*>::value && !is_const<TChar>::value, int>>
+inline MemberProxy<TDerived, AdaptedString<TChar*>>
+VariantRefBase<TDerived>::operator[](TChar* key) const {
+  return {derived(), adaptString(key)};
 }
 
 template <typename TDerived>
-template <typename TString>
-inline enable_if_t<IsString<TString>::value, MemberProxy<TDerived, TString>>
+template <typename TString, enable_if_t<IsString<TString>::value, int>>
+inline MemberProxy<TDerived, AdaptedString<TString>>
 VariantRefBase<TDerived>::operator[](const TString& key) const {
-  return MemberProxy<TDerived, TString>(derived(), key);
+  return {derived(), adaptString(key)};
 }
 
 template <typename TDerived>
 template <typename TConverter, typename T>
-inline bool VariantRefBase<TDerived>::doSet(T&& value, false_type) const {
+inline bool VariantRefBase<TDerived>::doSet(const T& value, false_type) const {
   TConverter::toJson(value, getOrCreateVariant());
   auto resources = getResourceManager();
   return resources && !resources->overflowed();
@@ -146,32 +143,29 @@ inline bool VariantRefBase<TDerived>::doSet(T&& value, false_type) const {
 
 template <typename TDerived>
 template <typename TConverter, typename T>
-inline bool VariantRefBase<TDerived>::doSet(T&& value, true_type) const {
+inline bool VariantRefBase<TDerived>::doSet(const T& value, true_type) const {
   return TConverter::toJson(value, getOrCreateVariant());
 }
 
 template <typename TDerived>
-template <typename T>
-inline enable_if_t<is_same<T, JsonArray>::value, JsonArray>
-VariantRefBase<TDerived>::to() const {
+template <typename T, enable_if_t<is_same<T, JsonArray>::value, int>>
+inline JsonArray VariantRefBase<TDerived>::to() const {
   return JsonArray(
       VariantData::toArray(getOrCreateData(), getResourceManager()),
       getResourceManager());
 }
 
 template <typename TDerived>
-template <typename T>
-enable_if_t<is_same<T, JsonObject>::value, JsonObject>
-VariantRefBase<TDerived>::to() const {
+template <typename T, enable_if_t<is_same<T, JsonObject>::value, int>>
+JsonObject VariantRefBase<TDerived>::to() const {
   return JsonObject(
       VariantData::toObject(getOrCreateData(), getResourceManager()),
       getResourceManager());
 }
 
 template <typename TDerived>
-template <typename T>
-enable_if_t<is_same<T, JsonVariant>::value, JsonVariant>
-VariantRefBase<TDerived>::to() const {
+template <typename T, enable_if_t<is_same<T, JsonVariant>::value, int>>
+JsonVariant VariantRefBase<TDerived>::to() const {
   auto data = getOrCreateData();
   auto resources = getResourceManager();
   detail::VariantData::clear(data, resources);
diff --git a/lib/ArduinoJson/src/ArduinoJson/Variant/VariantSlot.hpp b/lib/ArduinoJson/src/ArduinoJson/Variant/VariantSlot.hpp
deleted file mode 100644
index 35107fd2..00000000
--- a/lib/ArduinoJson/src/ArduinoJson/Variant/VariantSlot.hpp
+++ /dev/null
@@ -1,86 +0,0 @@
-// ArduinoJson - https://arduinojson.org
-// Copyright © 2014-2024, Benoit BLANCHON
-// MIT License
-
-#pragma once
-
-#include <ArduinoJson/Memory/ResourceManager.hpp>
-#include <ArduinoJson/Polyfills/limits.hpp>
-#include <ArduinoJson/Polyfills/type_traits.hpp>
-#include <ArduinoJson/Variant/VariantContent.hpp>
-
-ARDUINOJSON_BEGIN_PRIVATE_NAMESPACE
-
-struct StringNode;
-
-class VariantSlot {
-  // CAUTION: same layout as VariantData
-  // we cannot use composition because it adds padding
-  // (+20% on ESP8266 for example)
-  VariantContent content_;
-  uint8_t flags_;
-  SlotId next_;
-  const char* key_;
-
- public:
-  // Placement new
-  static void* operator new(size_t, void* p) noexcept {
-    return p;
-  }
-
-  static void operator delete(void*, void*) noexcept {}
-
-  VariantSlot() : flags_(0), next_(NULL_SLOT), key_(0) {}
-
-  VariantData* data() {
-    return reinterpret_cast<VariantData*>(&content_);
-  }
-
-  const VariantData* data() const {
-    return reinterpret_cast<const VariantData*>(&content_);
-  }
-
-  SlotId next() const {
-    return next_;
-  }
-
-  void setNext(SlotId slot) {
-    next_ = slot;
-  }
-
-  void setKey(const char* k) {
-    ARDUINOJSON_ASSERT(k);
-    flags_ &= VALUE_MASK;
-    key_ = k;
-  }
-
-  void setKey(StringNode* k) {
-    ARDUINOJSON_ASSERT(k);
-    flags_ |= OWNED_KEY_BIT;
-    key_ = k->data;
-  }
-
-  const char* key() const {
-    return key_;
-  }
-
-  bool ownsKey() const {
-    return (flags_ & OWNED_KEY_BIT) != 0;
-  }
-};
-
-inline VariantData* slotData(VariantSlot* slot) {
-  return reinterpret_cast<VariantData*>(slot);
-}
-
-// Returns the size (in bytes) of an array with n elements.
-constexpr size_t sizeofArray(size_t n) {
-  return n * sizeof(VariantSlot);
-}
-
-// Returns the size (in bytes) of an object with n members.
-constexpr size_t sizeofObject(size_t n) {
-  return n * sizeof(VariantSlot);
-}
-
-ARDUINOJSON_END_PRIVATE_NAMESPACE
diff --git a/lib/ArduinoJson/src/ArduinoJson/version.hpp b/lib/ArduinoJson/src/ArduinoJson/version.hpp
index 6df6b761..0d8cecb8 100644
--- a/lib/ArduinoJson/src/ArduinoJson/version.hpp
+++ b/lib/ArduinoJson/src/ArduinoJson/version.hpp
@@ -4,8 +4,8 @@
 
 #pragma once
 
-#define ARDUINOJSON_VERSION "7.2.1"
+#define ARDUINOJSON_VERSION "7.3.0"
 #define ARDUINOJSON_VERSION_MAJOR 7
-#define ARDUINOJSON_VERSION_MINOR 2
-#define ARDUINOJSON_VERSION_REVISION 1
-#define ARDUINOJSON_VERSION_MACRO V721
+#define ARDUINOJSON_VERSION_MINOR 3
+#define ARDUINOJSON_VERSION_REVISION 0
+#define ARDUINOJSON_VERSION_MACRO V730
diff --git a/src/idf_component.yml b/src/idf_component.yml
index 2c657a0e..5a9217d0 100644
--- a/src/idf_component.yml
+++ b/src/idf_component.yml
@@ -1,10 +1,10 @@
 dependencies:
   # Required IDF version
-  idf: ">=4.4"
+  idf: ">=5.2"
 
   esp-nimble-cpp:
     git: https://github.com/h2zero/esp-nimble-cpp.git
-    version: b50a1b50b1a66e872e7d3dbff653e20f9a40e102
+    version: fa468d360a56712f3f39a1fba74b97340ebca8a9
     
   espressif/libsodium: "^1.0.20~2"