diff --git a/CHANGELOG.md b/CHANGELOG.md
index b0f2f46f51..52aec6790c 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 2.16.4. [#2185](https://github.com/github/codeql-action/pull/2185)
 
 ## 3.24.6 - 29 Feb 2024
 
diff --git a/lib/defaults.json b/lib/defaults.json
index 9ad219e11c..67d6d4c614 100644
--- a/lib/defaults.json
+++ b/lib/defaults.json
@@ -1,6 +1,6 @@
 {
-    "bundleVersion": "codeql-bundle-v2.16.3",
-    "cliVersion": "2.16.3",
-    "priorBundleVersion": "codeql-bundle-v2.16.2",
-    "priorCliVersion": "2.16.2"
+    "bundleVersion": "codeql-bundle-v2.16.4",
+    "cliVersion": "2.16.4",
+    "priorBundleVersion": "codeql-bundle-v2.16.3",
+    "priorCliVersion": "2.16.3"
 }
diff --git a/src/defaults.json b/src/defaults.json
index f70e175c73..0b81906446 100644
--- a/src/defaults.json
+++ b/src/defaults.json
@@ -1,6 +1,6 @@
 {
-  "bundleVersion": "codeql-bundle-v2.16.3",
-  "cliVersion": "2.16.3",
-  "priorBundleVersion": "codeql-bundle-v2.16.2",
-  "priorCliVersion": "2.16.2"
+  "bundleVersion": "codeql-bundle-v2.16.4",
+  "cliVersion": "2.16.4",
+  "priorBundleVersion": "codeql-bundle-v2.16.3",
+  "priorCliVersion": "2.16.3"
 }