diff --git a/.node-version b/.node-version
index 0fcfe359..dbf2bf20 100644
--- a/.node-version
+++ b/.node-version
@@ -1 +1 @@
-v26.7.0
+v26.8.1
diff --git a/SECURITY.md b/SECURITY.md
index f8d05ba8..b4cdd676 100644
--- a/SECURITY.md
+++ b/SECURITY.md
@@ -13,7 +13,7 @@
 | 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 content        | CPython 3.14.7 (`.python-version`) | Install per-track requirements as documented.                                       |
-| JavaScript/TypeScript | Node v26.7.0 (`.node-version`)     | Frontend tracks (React/Vue/TS/JS) use Node tooling plus per-project `package.json`. |
+| JavaScript/TypeScript | Node v26.8.1 (`.node-version`)     | Frontend tracks (React/Vue/TS/JS) use Node tooling plus per-project `package.json`. |
 
 ## Backward Compatibility
 
diff --git a/javascript/README.md b/javascript/README.md
index 33cd5947..44c9409e 100644
--- a/javascript/README.md
+++ b/javascript/README.md
@@ -1,6 +1,6 @@
 ## 1. Environment
 
-- Node v26.7.0
+- Node v26.8.1
 - pnpm 12.3.4
 
 ## 2. Reference
diff --git a/javascript/package.json b/javascript/package.json
index 17a8ce03..6c5575f7 100644
--- a/javascript/package.json
+++ b/javascript/package.json
@@ -1,7 +1,7 @@
 {
   "name": "javascript_primer",
   "version": "1.0.0",
-  "description": "* WSL(Ubuntu 25.10 (GNU/Linux 6.6.87.2-microsoft-standard-WSL2 x86_64)) * Node.js v26.7.0 * pnpm 12.3.4",
+  "description": "* WSL(Ubuntu 25.10 (GNU/Linux 6.6.87.2-microsoft-standard-WSL2 x86_64)) * Node.js v26.8.1 * pnpm 12.3.4",
   "main": "index.js",
   "scripts": {
     "test": "mocha nodejs/test/"
diff --git a/ruby-on-rails/perfect-ruby-on-rails/.node-version b/ruby-on-rails/perfect-ruby-on-rails/.node-version
index 0fcfe359..dbf2bf20 100644
--- a/ruby-on-rails/perfect-ruby-on-rails/.node-version
+++ b/ruby-on-rails/perfect-ruby-on-rails/.node-version
@@ -1 +1 @@
-v26.7.0
+v26.8.1
diff --git a/ruby-on-rails/perfect-ruby-on-rails/Dockerfile b/ruby-on-rails/perfect-ruby-on-rails/Dockerfile
index c7e25a49..ca6c530a 100644
--- a/ruby-on-rails/perfect-ruby-on-rails/Dockerfile
+++ b/ruby-on-rails/perfect-ruby-on-rails/Dockerfile
@@ -1,4 +1,4 @@
-FROM node:26.7.0 AS node
+FROM node:26.8.1 AS node
 FROM ruby:4.0.6
 
 # Install Packages
diff --git a/ruby-on-rails/perfect-ruby-on-rails/Dockerfile.production b/ruby-on-rails/perfect-ruby-on-rails/Dockerfile.production
index b8ec1e9f..01a1a5a8 100644
--- a/ruby-on-rails/perfect-ruby-on-rails/Dockerfile.production
+++ b/ruby-on-rails/perfect-ruby-on-rails/Dockerfile.production
@@ -2,7 +2,7 @@
 
 # Production image built and deployed by Kamal (see config/deploy.yml).
 # Development keeps using ./Dockerfile via docker-compose.yml.
-FROM docker.io/library/node:26.7.0-slim AS node
+FROM docker.io/library/node:26.8.1-slim AS node
 
 ARG RUBY_VERSION=4.0.6
 FROM docker.io/library/ruby:$RUBY_VERSION-slim AS base
diff --git a/ruby-on-rails/perfect-ruby-on-rails/README.md b/ruby-on-rails/perfect-ruby-on-rails/README.md
index 07bf6265..c451e003 100644
--- a/ruby-on-rails/perfect-ruby-on-rails/README.md
+++ b/ruby-on-rails/perfect-ruby-on-rails/README.md
@@ -1,6 +1,6 @@
 ## 1. Environment
 
-- Node v26.7.0
+- Node v26.8.1
 - pnpm 12.3.4
 
 ## 2. Reference
diff --git a/ruby-on-rails/perfect-ruby-on-rails/package.json b/ruby-on-rails/perfect-ruby-on-rails/package.json
index f801bd99..e3007b9b 100644
--- a/ruby-on-rails/perfect-ruby-on-rails/package.json
+++ b/ruby-on-rails/perfect-ruby-on-rails/package.json
@@ -1,7 +1,7 @@
 {
   "name": "perfect_ruby_on_rails",
   "version": "0.1.0",
-  "description": "* WSL(Ubuntu 25.10 (GNU/Linux 6.6.87.2-microsoft-standard-WSL2 x86_64)) * Node.js v26.7.0 * pnpm 12.3.4",
+  "description": "* WSL(Ubuntu 25.10 (GNU/Linux 6.6.87.2-microsoft-standard-WSL2 x86_64)) * Node.js v26.8.1 * pnpm 12.3.4",
   "private": true,
   "dependencies": {
     "@hotwired/turbo-rails": "^8.0.23",
diff --git a/typescript/README.md b/typescript/README.md
index 2648dde2..be8ae1f0 100644
--- a/typescript/README.md
+++ b/typescript/README.md
@@ -1,7 +1,7 @@
 ## 1. Environment
 
 - WSL (Ubuntu 25.10)
-- Node v26.7.0
+- Node v26.8.1
 - pnpm 12.3.4
 
 ## 2. Reference
diff --git a/typescript/package.json b/typescript/package.json
index e9bf2ea1..c8f8da33 100644
--- a/typescript/package.json
+++ b/typescript/package.json
@@ -1,7 +1,7 @@
 {
   "name": "javascript_primer",
   "version": "1.0.0",
-  "description": "* WSL(Ubuntu 25.10 (GNU/Linux 6.6.87.2-microsoft-standard-WSL2 x86_64)) * Node.js v26.7.0 * pnpm 12.3.4",
+  "description": "* WSL(Ubuntu 25.10 (GNU/Linux 6.6.87.2-microsoft-standard-WSL2 x86_64)) * Node.js v26.8.1 * pnpm 12.3.4",
   "main": "index.js",
   "scripts": {
     "test": "mocha nodejs/test/"
diff --git a/vuejs/README.md b/vuejs/README.md
index 24adab25..cd72f484 100644
--- a/vuejs/README.md
+++ b/vuejs/README.md
@@ -1,7 +1,7 @@
 ## 1. Environment
 
 - WSL (Ubuntu 25.10)
-- Node v26.7.0
+- Node v26.8.1
 - pnpm 12.3.4
 - Vue 3.5.41