diff --git a/CHANGELOG.md b/CHANGELOG.md
index cecfa1de5..0bca12c1f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@ Note that the only difference between `v2` and `v3` of the CodeQL Action is the
 ## [UNRELEASED]
 
 - The CodeQL Action now downloads bundles compressed using Zstandard on GitHub Enterprise Server when using Linux or macOS runners. This speeds up the installation of the CodeQL tools. This feature is already available to GitHub.com users. [#2573](https://github.com/github/codeql-action/pull/2573)
+- Update default CodeQL bundle version to 2.19.3. [#2576](https://github.com/github/codeql-action/pull/2576)
 
 ## 3.27.0 - 22 Oct 2024
 
diff --git a/lib/defaults.json b/lib/defaults.json
index 58a0b1f58..71daeec20 100644
--- a/lib/defaults.json
+++ b/lib/defaults.json
@@ -1,6 +1,6 @@
 {
-    "bundleVersion": "codeql-bundle-v2.19.2",
-    "cliVersion": "2.19.2",
-    "priorBundleVersion": "codeql-bundle-v2.19.1",
-    "priorCliVersion": "2.19.1"
+    "bundleVersion": "codeql-bundle-v2.19.3",
+    "cliVersion": "2.19.3",
+    "priorBundleVersion": "codeql-bundle-v2.19.2",
+    "priorCliVersion": "2.19.2"
 }
diff --git a/src/defaults.json b/src/defaults.json
index d817dee77..7ee20851f 100644
--- a/src/defaults.json
+++ b/src/defaults.json
@@ -1,6 +1,6 @@
 {
-  "bundleVersion": "codeql-bundle-v2.19.2",
-  "cliVersion": "2.19.2",
-  "priorBundleVersion": "codeql-bundle-v2.19.1",
-  "priorCliVersion": "2.19.1"
+  "bundleVersion": "codeql-bundle-v2.19.3",
+  "cliVersion": "2.19.3",
+  "priorBundleVersion": "codeql-bundle-v2.19.2",
+  "priorCliVersion": "2.19.2"
 }