diff --git a/.github/actions/setup-node/action.yml b/.github/actions/setup-node/action.yml
index 7372943..1929439 100644
--- a/.github/actions/setup-node/action.yml
+++ b/.github/actions/setup-node/action.yml
@@ -3,10 +3,10 @@ description: "Install pnpm and setup Node.js with pnpm cache (fixed versions)"
 runs:
   using: "composite"
   steps:
-    - name: Setup Node.js 20.12.0
+    - name: Setup Node.js
       uses: actions/setup-node@8f152de45cc393bb48ce5d89d36b731f54556e65 # v4.0.0
       with:
-        node-version: 20.12.0
+        node-version-file: '.node-version'
 
     - name: Setup pnpm
       shell: bash
diff --git a/.node-version b/.node-version
index 2b9cabc..5bd6811 100644
--- a/.node-version
+++ b/.node-version
@@ -1 +1 @@
-20.12.0
+20.19.0
diff --git a/README.md b/README.md
index d676baf..cfb4b99 100644
--- a/README.md
+++ b/README.md
@@ -68,7 +68,7 @@ The application reads Claude Code conversation logs from:
 
 ### System Requirements
 
-- **Node.js**: Version 20.12.0 or later
+- **Node.js**: Version 20.18.1 or later
 - **Operating Systems**: macOS and Linux (Windows is not supported)
 
 ### Claude Code Compatibility
diff --git a/docs/dev.md b/docs/dev.md
index fb42b2d..74bd67f 100644
--- a/docs/dev.md
+++ b/docs/dev.md
@@ -49,7 +49,7 @@ Claude Code Viewer provides advanced control over Claude Code session processes:
 
 ### Requirements
 
-- **Node.js**: Version 20.12.0 or later (see [.node-version](../.node-version))
+- **Node.js**: Version 20.19.0 or later (see [.node-version](../.node-version))
 - **Package Manager**: pnpm 10.8.1 or later
 
 ### Initial Setup
diff --git a/package.json b/package.json
index 29dd744..41ddc34 100644
--- a/package.json
+++ b/package.json
@@ -12,7 +12,7 @@
     "dist"
   ],
   "engines": {
-    "node": ">=20.12.0"
+    "node": ">=20.19.0"
   },
   "exports": {
     ".": "./dist/index.js",