diff --git a/CHANGELOG.md b/CHANGELOG.md
index cecfa1de54..0bca12c1f3 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 58a0b1f58e..71daeec20c 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 d817dee776..7ee20851fa 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"
 }