diff --git a/CHANGELOG.md b/CHANGELOG.md
index a7ecdb0182..76be0a99b4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,7 +4,7 @@ See the [releases page](https://github.com/github/codeql-action/releases) for th
 
 ## [UNRELEASED]
 
-No user facing changes.
+- Update default CodeQL bundle version to [2.26.0](https://github.com/github/codeql-action/releases/tag/codeql-bundle-v2.26.0). [#3995](https://github.com/github/codeql-action/pull/3995)
 
 ## 4.36.3 - 01 Jul 2026
 
diff --git a/lib/defaults.json b/lib/defaults.json
index 7c82ff2a6e..660296139f 100644
--- a/lib/defaults.json
+++ b/lib/defaults.json
@@ -1,6 +1,6 @@
 {
-  "bundleVersion": "codeql-bundle-v2.25.6",
-  "cliVersion": "2.25.6",
-  "priorBundleVersion": "codeql-bundle-v2.25.5",
-  "priorCliVersion": "2.25.5"
+  "bundleVersion": "codeql-bundle-v2.26.0",
+  "cliVersion": "2.26.0",
+  "priorBundleVersion": "codeql-bundle-v2.25.6",
+  "priorCliVersion": "2.25.6"
 }
diff --git a/lib/entry-points.js b/lib/entry-points.js
index d3c07ccf24..e8ee3fc281 100644
--- a/lib/entry-points.js
+++ b/lib/entry-points.js
@@ -145002,7 +145002,7 @@ function getDiffRangesJsonFilePath() {
   return path2.join(getTemporaryDirectory(), PR_DIFF_RANGE_JSON_FILENAME);
 }
 function getActionVersion() {
-  return "4.36.4";
+  return "4.37.0";
 }
 function getWorkflowEventName() {
   return getRequiredEnvParam("GITHUB_EVENT_NAME" /* GITHUB_EVENT_NAME */);
@@ -146204,8 +146204,8 @@ var path5 = __toESM(require("path"));
 var semver4 = __toESM(require_semver2());
 
 // src/defaults.json
-var bundleVersion = "codeql-bundle-v2.25.6";
-var cliVersion = "2.25.6";
+var bundleVersion = "codeql-bundle-v2.26.0";
+var cliVersion = "2.26.0";
 
 // src/overlay/index.ts
 var fs4 = __toESM(require("fs"));
diff --git a/package-lock.json b/package-lock.json
index ef78f95bd9..83c1027a0a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "codeql",
-  "version": "4.36.4",
+  "version": "4.37.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "codeql",
-      "version": "4.36.4",
+      "version": "4.37.0",
       "license": "MIT",
       "workspaces": [
         "pr-checks"
diff --git a/package.json b/package.json
index 32088c5063..2734c27f6a 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "codeql",
-  "version": "4.36.4",
+  "version": "4.37.0",
   "private": true,
   "description": "CodeQL action",
   "scripts": {
diff --git a/src/defaults.json b/src/defaults.json
index 7c82ff2a6e..660296139f 100644
--- a/src/defaults.json
+++ b/src/defaults.json
@@ -1,6 +1,6 @@
 {
-  "bundleVersion": "codeql-bundle-v2.25.6",
-  "cliVersion": "2.25.6",
-  "priorBundleVersion": "codeql-bundle-v2.25.5",
-  "priorCliVersion": "2.25.5"
+  "bundleVersion": "codeql-bundle-v2.26.0",
+  "cliVersion": "2.26.0",
+  "priorBundleVersion": "codeql-bundle-v2.25.6",
+  "priorCliVersion": "2.25.6"
 }