diff --git a/.github/workflows/test-stable.yml b/.github/workflows/test-stable.yml
index 3e5c9117..76ef5a6c 100644
--- a/.github/workflows/test-stable.yml
+++ b/.github/workflows/test-stable.yml
@@ -1140,7 +1140,7 @@ jobs:
       uses: actions/checkout@v4
       with:
         path: sable
-        ref: e9701e5e8d0c4f278ddd61ce7285f4918ecf99e9
+        ref: 52397dc9e0f27c3ed197f984c00f06639870716d
         repository: Libera-Chat/sable
     - name: Install rust toolchain
       uses: actions-rs/toolchain@v1
diff --git a/Makefile b/Makefile
index dc245869..b85ce666 100644
--- a/Makefile
+++ b/Makefile
@@ -84,15 +84,12 @@ LIMNORIA_SELECTORS := \
 	$(EXTRA_SELECTORS)
 
 # Tests marked with arbitrary_client_tags or react_tag can't pass because Sable does not support client tags yet
-# Tests marked with private_chathistory can't pass because Sable does not implement CHATHISTORY for DMs
-
 SABLE_SELECTORS := \
 	not Ergo \
 	and not deprecated \
 	and not strict \
 	and not arbitrary_client_tags \
 	and not react_tag \
-	and not private_chathistory \
 	and not list and not lusers and not time and not info \
 	$(EXTRA_SELECTORS)
 
diff --git a/irctest/server_tests/whois.py b/irctest/server_tests/whois.py
index 274fe04d..475dcf66 100644
--- a/irctest/server_tests/whois.py
+++ b/irctest/server_tests/whois.py
@@ -221,7 +221,6 @@ def testWhoisUser(self, server):
         )
 
     @cases.mark_specifications("RFC2812")
-    @cases.xfailIfSoftware(["Sable"], "https://github.com/Libera-Chat/sable/issues/101")
     def testWhoisMissingUser(self):
         """Test WHOIS on a nonexistent nickname."""
         self.connectClient("qux", name="qux")
diff --git a/workflows.yml b/workflows.yml
index 1995b871..fbf7b951 100644
--- a/workflows.yml
+++ b/workflows.yml
@@ -249,7 +249,7 @@ software:
         name: Sable
         repository: Libera-Chat/sable
         refs:
-            stable: e9701e5e8d0c4f278ddd61ce7285f4918ecf99e9
+            stable: 52397dc9e0f27c3ed197f984c00f06639870716d
             release: null
             devel: master
             devel_release: null