diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6268516918..d9d376753e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,7 +2,7 @@
 
 ## [UNRELEASED]
 
-No user facing changes.
+- Update default CodeQL bundle version to 2.5.9. [#687](https://github.com/github/codeql-action/pull/687)
 
 ## 1.0.10 - 03 Aug 2021