diff --git a/CHANGELOG.md b/CHANGELOG.md
index aa09c81996..7f27565092 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@ See the [releases page](https://github.com/github/codeql-action/releases) for th
 
 ## [UNRELEASED]
 
+- Update default CodeQL bundle version to 2.21.3. [#2893](https://github.com/github/codeql-action/pull/2893)
 - Skip validating SARIF produced by CodeQL for improved performance. [#2894](https://github.com/github/codeql-action/pull/2894)
 - The number of threads and amount of RAM used by CodeQL can now be set via the `CODEQL_THREADS` and `CODEQL_RAM` runner environment variables. If set, these environment variables override the `threads` and `ram` inputs respectively. [#2891](https://github.com/github/codeql-action/pull/2891)
 
diff --git a/lib/defaults.json b/lib/defaults.json
index d816c25af8..74df6ad6d2 100644
--- a/lib/defaults.json
+++ b/lib/defaults.json
@@ -1,6 +1,6 @@
 {
-    "bundleVersion": "codeql-bundle-v2.21.2",
-    "cliVersion": "2.21.2",
-    "priorBundleVersion": "codeql-bundle-v2.21.1",
-    "priorCliVersion": "2.21.1"
+    "bundleVersion": "codeql-bundle-v2.21.3",
+    "cliVersion": "2.21.3",
+    "priorBundleVersion": "codeql-bundle-v2.21.2",
+    "priorCliVersion": "2.21.2"
 }
diff --git a/src/defaults.json b/src/defaults.json
index 29b3e671f8..8232e77e30 100644
--- a/src/defaults.json
+++ b/src/defaults.json
@@ -1,6 +1,6 @@
 {
-  "bundleVersion": "codeql-bundle-v2.21.2",
-  "cliVersion": "2.21.2",
-  "priorBundleVersion": "codeql-bundle-v2.21.1",
-  "priorCliVersion": "2.21.1"
+  "bundleVersion": "codeql-bundle-v2.21.3",
+  "cliVersion": "2.21.3",
+  "priorBundleVersion": "codeql-bundle-v2.21.2",
+  "priorCliVersion": "2.21.2"
 }