diff --git a/CHANGELOG.md b/CHANGELOG.md
index d2fe67071e..747866b400 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,7 +6,7 @@ Note that the only difference between `v2` and `v3` of the CodeQL Action is the
 
 ## [UNRELEASED]
 
-No user facing changes.
+- Update default CodeQL bundle version to 2.20.1. [#2678](https://github.com/github/codeql-action/pull/2678)
 
 ## 3.28.0 - 20 Dec 2024
 
diff --git a/lib/defaults.json b/lib/defaults.json
index 6ece99d325..1afbbc52d3 100644
--- a/lib/defaults.json
+++ b/lib/defaults.json
@@ -1,6 +1,6 @@
 {
-    "bundleVersion": "codeql-bundle-v2.20.0",
-    "cliVersion": "2.20.0",
-    "priorBundleVersion": "codeql-bundle-v2.19.4",
-    "priorCliVersion": "2.19.4"
+    "bundleVersion": "codeql-bundle-v2.20.1",
+    "cliVersion": "2.20.1",
+    "priorBundleVersion": "codeql-bundle-v2.20.0",
+    "priorCliVersion": "2.20.0"
 }
diff --git a/src/defaults.json b/src/defaults.json
index 605f18897b..3c3e56944a 100644
--- a/src/defaults.json
+++ b/src/defaults.json
@@ -1,6 +1,6 @@
 {
-  "bundleVersion": "codeql-bundle-v2.20.0",
-  "cliVersion": "2.20.0",
-  "priorBundleVersion": "codeql-bundle-v2.19.4",
-  "priorCliVersion": "2.19.4"
+  "bundleVersion": "codeql-bundle-v2.20.1",
+  "cliVersion": "2.20.1",
+  "priorBundleVersion": "codeql-bundle-v2.20.0",
+  "priorCliVersion": "2.20.0"
 }