diff --git a/.node-version b/.node-version
index f7a56c9..eacd481 100644
--- a/.node-version
+++ b/.node-version
@@ -1 +1 @@
-v26.4.0
+v26.5.0
diff --git a/SECURITY.md b/SECURITY.md
index d80a2c8..929fd05 100644
--- a/SECURITY.md
+++ b/SECURITY.md
@@ -12,7 +12,7 @@
 | Gemfile              | 4.0.16                             | Per-project dependency manifest; versions install via Bundler.                  |
 | Bundler              | 4.0.16                             | Resolves and installs the gems declared in the Gemfile.                         |
 | Python exercises     | CPython 3.14.6 (`.python-version`) | Requirements are declared per exercise; base templates use stdlib only.         |
-| JavaScript exercises | Node v26.4.0 (`.node-version`)     | Use the Node toolchain plus any dependencies listed inside each `package.json`. |
+| JavaScript exercises | Node v26.5.0 (`.node-version`)     | Use the Node toolchain plus any dependencies listed inside each `package.json`. |
 
 ## Backward Compatibility
 
diff --git a/javascript/README.md b/javascript/README.md
index 63d61af..39ae3f6 100644
--- a/javascript/README.md
+++ b/javascript/README.md
@@ -1,7 +1,7 @@
 ## 1. Environment
 
-- Node v26.4.0
-- pnpm 11.9.0
+- Node v26.5.0
+- pnpm 11.13.0
 
 ## 2. JEST install for Unit Test
 
diff --git a/javascript/package.json b/javascript/package.json
index 1144ab8..a9e5fa0 100644
--- a/javascript/package.json
+++ b/javascript/package.json
@@ -1,7 +1,7 @@
 {
   "name": "coding-test-js",
   "version": "1.0.0",
-  "description": "* WSL(Ubuntu 25.10 (GNU/Linux 6.6.87.2-microsoft-standard-WSL2 x86_64)) * Node.js v26.4.0 * pnpm 11.9.0",
+  "description": "* WSL(Ubuntu 25.10 (GNU/Linux 6.6.87.2-microsoft-standard-WSL2 x86_64)) * Node.js v26.5.0 * pnpm 11.13.0",
   "main": "index.js",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1"