diff --git a/packages/notus/lib/src/heuristics/insert_rules.dart b/packages/notus/lib/src/heuristics/insert_rules.dart
index 2eb358aae..0b92ad102 100644
--- a/packages/notus/lib/src/heuristics/insert_rules.dart
+++ b/packages/notus/lib/src/heuristics/insert_rules.dart
@@ -260,7 +260,7 @@ class PreserveInlineStylesRule extends InsertRule {
       return noLinkResult;
     }
     // We must make sure links are identical in previous and next operations.
-    if (attributes![NotusAttribute.link.key] ==
+    if (attributes[NotusAttribute.link.key] ==
         nextAttributes[NotusAttribute.link.key]) {
       return Delta()
         ..retain(index)
diff --git a/packages/notus/pubspec.yaml b/packages/notus/pubspec.yaml
index 334a25911..c79450bcf 100644
--- a/packages/notus/pubspec.yaml
+++ b/packages/notus/pubspec.yaml
@@ -4,14 +4,14 @@ version: 1.0.0-rc.2
 homepage: https://github.com/memspace/zefyr
 
 environment:
-  sdk: '>=2.12.0 <3.0.0'
+  sdk: ">=2.18.0 <4.0.0"
 
 dependencies:
-  collection: ^1.15.0
-  coverage: ^1.0.3
-  quill_delta: ^3.0.0-nullsafety.1
-  quiver: ^3.0.1
+  collection: 1.16.0
+  coverage: 1.5.0
+  quill_delta: ^3.0.0-nullsafety.2
+  quiver: ^3.1.0
 
 dev_dependencies:
-  test: ^1.10.0
-  lints: ^1.0.1
+  test: ^1.21.6
+  lints: ^2.0.0
diff --git a/packages/zefyr/pubspec.yaml b/packages/zefyr/pubspec.yaml
index 992d32f94..e48c1aab3 100644
--- a/packages/zefyr/pubspec.yaml
+++ b/packages/zefyr/pubspec.yaml
@@ -2,20 +2,27 @@ name: zefyr
 description: Clean, minimalistic and collaboration-ready rich text editor for Flutter.
 version: 1.0.0-rc.5
 homepage: https://github.com/memspace/zefyr
+publish_to: none
 
 environment:
-  sdk: '>=2.15.0 <3.0.0'
+  sdk: ">=2.18.0 <4.0.0"
 
 dependencies:
   flutter:
     sdk: flutter
-  collection: ^1.14.6
-  url_launcher: ^6.0.9
-  quill_delta: ^3.0.0-nullsafety.1
-  notus: ^1.0.0-rc.2
-  characters: ^1.0.0
+  collection: 1.16.0
+  url_launcher: ^6.1.6
+  quill_delta: ^3.0.0-nullsafety.2
+
+  notus:
+    git:
+      url: https://github.com/memspace/zefyr
+      path: packages/notus
+      ref: 6f9281913c8f8699444a745cf8ada92a87c6a908
+
+  characters: ^1.2.1
 
 dev_dependencies:
   flutter_test:
     sdk: flutter
-  flutter_lints: ^1.0.4
+  flutter_lints: ^2.0.1