diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7e858e7936..ba34513686 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,7 +2,7 @@
 
 ## [UNRELEASED]
 
-No user facing changes.
+- Update default CodeQL bundle version to 2.12.6. [#1629](https://github.com/github/codeql-action/pull/1629)
 
 ## 2.2.9 - 27 Mar 2023
 
diff --git a/lib/defaults.json b/lib/defaults.json
index fe191836e0..10cc950fcc 100644
--- a/lib/defaults.json
+++ b/lib/defaults.json
@@ -1,6 +1,6 @@
 {
-    "bundleVersion": "codeql-bundle-20230317",
-    "cliVersion": "2.12.5",
-    "priorBundleVersion": "codeql-bundle-20230304",
-    "priorCliVersion": "2.12.4"
+    "bundleVersion": "codeql-bundle-20230403",
+    "cliVersion": "2.12.6",
+    "priorBundleVersion": "codeql-bundle-20230317",
+    "priorCliVersion": "2.12.5"
 }
diff --git a/src/defaults.json b/src/defaults.json
index c4597cc383..659c095640 100644
--- a/src/defaults.json
+++ b/src/defaults.json
@@ -1,6 +1,6 @@
 {
-  "bundleVersion": "codeql-bundle-20230317",
-  "cliVersion": "2.12.5",
-  "priorBundleVersion": "codeql-bundle-20230304",
-  "priorCliVersion": "2.12.4"
+  "bundleVersion": "codeql-bundle-20230403",
+  "cliVersion": "2.12.6",
+  "priorBundleVersion": "codeql-bundle-20230317",
+  "priorCliVersion": "2.12.5"
 }