diff --git a/CHANGELOG.md b/CHANGELOG.md
index 129707222b..dfe0982c06 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]
 
 - We are rolling out a change in December 2024 that will extract the CodeQL bundle directly to the toolcache to improve performance. [#2631](https://github.com/github/codeql-action/pull/2631)
+- Update default CodeQL bundle version to 2.20.0. [#2636](https://github.com/github/codeql-action/pull/2636)
 
 ## 3.27.6 - 03 Dec 2024
 
diff --git a/lib/defaults.json b/lib/defaults.json
index 2e084a4ce5..6ece99d325 100644
--- a/lib/defaults.json
+++ b/lib/defaults.json
@@ -1,6 +1,6 @@
 {
-    "bundleVersion": "codeql-bundle-v2.19.4",
-    "cliVersion": "2.19.4",
-    "priorBundleVersion": "codeql-bundle-v2.19.3",
-    "priorCliVersion": "2.19.3"
+    "bundleVersion": "codeql-bundle-v2.20.0",
+    "cliVersion": "2.20.0",
+    "priorBundleVersion": "codeql-bundle-v2.19.4",
+    "priorCliVersion": "2.19.4"
 }
diff --git a/src/defaults.json b/src/defaults.json
index 6e0e0dbbce..605f18897b 100644
--- a/src/defaults.json
+++ b/src/defaults.json
@@ -1,6 +1,6 @@
 {
-  "bundleVersion": "codeql-bundle-v2.19.4",
-  "cliVersion": "2.19.4",
-  "priorBundleVersion": "codeql-bundle-v2.19.3",
-  "priorCliVersion": "2.19.3"
+  "bundleVersion": "codeql-bundle-v2.20.0",
+  "cliVersion": "2.20.0",
+  "priorBundleVersion": "codeql-bundle-v2.19.4",
+  "priorCliVersion": "2.19.4"
 }