diff --git a/guides/source/5_0_release_notes.md b/guides/source/5_0_release_notes.md
index 8c2e43d0f8c0938d75195bd2f6b2a2717a80598e..3573cecbe00d219f13c7ddd911d1a539a4868c46 100644
--- a/guides/source/5_0_release_notes.md
+++ b/guides/source/5_0_release_notes.md
@@ -646,7 +646,7 @@ Please refer to the [Changelog][active-support] for detailed changes.
     ([Pull Request](https://github.com/rails/rails/pull/16938))
 
 *   Removed deprecated `ThreadSafe::Cache`. Use `Concurrent::Map` instead.
-    ([Pull Request](https://github.com/rails/rails/pull/16938))
+    ([Pull Request](https://github.com/rails/rails/pull/21679))
 
 ### Deprecations