diff --git a/CHANGELOG.md b/CHANGELOG.md
index 95f947ec14..dac860106b 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 2.20.5. [#2772](https://github.com/github/codeql-action/pull/2772)
 - Address an issue where the CodeQL Bundle would occasionally fail to decompress on macOS. [#2768](https://github.com/github/codeql-action/pull/2768)
 
 ## 3.28.9 - 07 Feb 2025
diff --git a/lib/defaults.json b/lib/defaults.json
index 0cf44ca0a0..eb86ae86c0 100644
--- a/lib/defaults.json
+++ b/lib/defaults.json
@@ -1,6 +1,6 @@
 {
-    "bundleVersion": "codeql-bundle-v2.20.4",
-    "cliVersion": "2.20.4",
-    "priorBundleVersion": "codeql-bundle-v2.20.3",
-    "priorCliVersion": "2.20.3"
+    "bundleVersion": "codeql-bundle-v2.20.5",
+    "cliVersion": "2.20.5",
+    "priorBundleVersion": "codeql-bundle-v2.20.4",
+    "priorCliVersion": "2.20.4"
 }
diff --git a/src/defaults.json b/src/defaults.json
index a33f8560ea..c23048c950 100644
--- a/src/defaults.json
+++ b/src/defaults.json
@@ -1,6 +1,6 @@
 {
-  "bundleVersion": "codeql-bundle-v2.20.4",
-  "cliVersion": "2.20.4",
-  "priorBundleVersion": "codeql-bundle-v2.20.3",
-  "priorCliVersion": "2.20.3"
+  "bundleVersion": "codeql-bundle-v2.20.5",
+  "cliVersion": "2.20.5",
+  "priorBundleVersion": "codeql-bundle-v2.20.4",
+  "priorCliVersion": "2.20.4"
 }