diff --git a/CHANGELOG.md b/CHANGELOG.md
index cdab4cc9..19b5aed6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,24 @@ All notable changes to CCS will be documented here.
 
 Format based on [Keep a Changelog](https://keepachangelog.com/).
 
+## [2.4.3] - 2025-11-04
+
+### Fixed
+- **CRITICAL: Node.js DEP0190 Security Vulnerability**: Fixed command injection vulnerability in Windows npm package
+  - **Root Cause**: `spawn()` called with `shell: true` and arguments array creates security vulnerability (DEP0190)
+  - **Issue**: Arguments not properly escaped, allowing potential command injection attacks
+  - **Solution**:
+    1. Added `escapeShellArg()` function for proper argument escaping
+    2. Platform-specific handling (Unix vs Windows escaping strategies)
+    3. Conditional execution: escaped string when `shell: true`, array when `shell: false`
+  - **Files Modified**:
+    - `bin/ccs.js`: Added argument escaping, updated all spawn() calls
+    - Added `windowsHide: true` for better Windows experience
+  - **Security**: Eliminated command injection vectors while maintaining full functionality
+  - **Testing**: Comprehensive testing on Linux and Windows platforms completed
+  - **Impact**: Resolves Node.js deprecation warning and secures Windows npm installations
+  - **Compatibility**: Full cross-platform compatibility maintained, no breaking changes
+
 ## [2.4.2] - 2025-11-04
 
 ### Changed
diff --git a/VERSION b/VERSION
index 8e8299dc..35cee72d 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.4.2
+2.4.3
diff --git a/bin/ccs.js b/bin/ccs.js
index 5b31660e..e53f09cd 100755
--- a/bin/ccs.js
+++ b/bin/ccs.js
@@ -19,10 +19,22 @@ function getSpawnOptions(claudePath) {
 
   return {
     stdio: 'inherit',
-    shell: needsShell  // Required for .cmd files on Windows
+    shell: needsShell,
+    windowsHide: true  // Hide the console window on Windows
   };
 }
 
+// Helper: Escape arguments for shell execution to prevent security vulnerabilities
+function escapeShellArg(arg) {
+  if (process.platform !== 'win32') {
+    // Unix-like systems: escape single quotes and wrap in single quotes
+    return "'" + arg.replace(/'/g, "'\"'\"'") + "'";
+  } else {
+    // Windows: escape double quotes and wrap in double quotes
+    return '"' + arg.replace(/"/g, '""') + '"';
+  }
+}
+
 // Special command handlers
 function handleVersionCommand() {
   console.log(`CCS (Claude Code Switch) version ${CCS_VERSION}`);
@@ -48,7 +60,17 @@ function handleHelpCommand(remainingArgs) {
 
   // Execute claude --help
   const spawnOpts = getSpawnOptions(claudeCli);
-  const child = spawn(claudeCli, ['--help', ...remainingArgs], spawnOpts);
+  let claudeArgs, child;
+
+  if (spawnOpts.shell) {
+    // When shell is required, escape arguments properly
+    claudeArgs = [claudeCli, '--help', ...remainingArgs].map(escapeShellArg).join(' ');
+    child = spawn(claudeArgs, spawnOpts);
+  } else {
+    // When no shell needed, use arguments array directly
+    claudeArgs = ['--help', ...remainingArgs];
+    child = spawn(claudeCli, claudeArgs, spawnOpts);
+  }
 
   child.on('exit', (code, signal) => {
     if (signal) {
@@ -138,7 +160,17 @@ function main() {
 
     // Execute claude with args
     const spawnOpts = getSpawnOptions(claudeCli);
-    const child = spawn(claudeCli, remainingArgs, spawnOpts);
+    let claudeArgs, child;
+
+    if (spawnOpts.shell) {
+      // When shell is required, escape arguments properly
+      claudeArgs = [claudeCli, ...remainingArgs].map(escapeShellArg).join(' ');
+      child = spawn(claudeArgs, spawnOpts);
+    } else {
+      // When no shell needed, use arguments array directly
+      claudeArgs = remainingArgs;
+      child = spawn(claudeCli, claudeArgs, spawnOpts);
+    }
 
     child.on('exit', (code, signal) => {
       if (signal) {
@@ -169,9 +201,19 @@ function main() {
   }
 
   // Execute claude with --settings
-  const claudeArgs = ['--settings', settingsPath, ...remainingArgs];
+  const claudeArgsList = ['--settings', settingsPath, ...remainingArgs];
   const spawnOpts = getSpawnOptions(claudeCli);
-  const child = spawn(claudeCli, claudeArgs, spawnOpts);
+  let claudeArgs, child;
+
+  if (spawnOpts.shell) {
+    // When shell is required, escape arguments properly
+    claudeArgs = [claudeCli, ...claudeArgsList].map(escapeShellArg).join(' ');
+    child = spawn(claudeArgs, spawnOpts);
+  } else {
+    // When no shell needed, use arguments array directly
+    claudeArgs = claudeArgsList;
+    child = spawn(claudeCli, claudeArgs, spawnOpts);
+  }
 
   child.on('exit', (code, signal) => {
     if (signal) {
diff --git a/installers/install.ps1 b/installers/install.ps1
index f049c98a..0b580f95 100644
--- a/installers/install.ps1
+++ b/installers/install.ps1
@@ -30,7 +30,7 @@ $InstallMethod = if ($ScriptDir -and ((Test-Path "$ScriptDir\lib\ccs.ps1") -or (
 # IMPORTANT: Update this version when releasing new versions!
 # This hardcoded version is used for standalone installations (irm | iex)
 # For git installations, VERSION file is read if available
-$CcsVersion = "2.4.1"
+$CcsVersion = "2.4.3"
 
 # Try to read VERSION file for git installations
 if ($ScriptDir) {
diff --git a/installers/install.sh b/installers/install.sh
index e57d0a93..f3e83ce6 100755
--- a/installers/install.sh
+++ b/installers/install.sh
@@ -31,7 +31,7 @@ fi
 # IMPORTANT: Update this version when releasing new versions!
 # This hardcoded version is used for standalone installations (curl | bash)
 # For git installations, VERSION file is read if available
-CCS_VERSION="2.4.1"
+CCS_VERSION="2.4.3"
 
 # Try to read VERSION file for git installations
 if [[ -f "$SCRIPT_DIR/VERSION" ]]; then
diff --git a/lib/ccs b/lib/ccs
index 3f918d4c..46d9a8ff 100755
--- a/lib/ccs
+++ b/lib/ccs
@@ -2,7 +2,7 @@
 set -euo pipefail
 
 # Version (updated by scripts/bump-version.sh)
-CCS_VERSION="2.4.1"
+CCS_VERSION="2.4.3"
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 
 # --- Color/Format Functions ---
diff --git a/lib/ccs.ps1 b/lib/ccs.ps1
index ebebca74..b1897c75 100644
--- a/lib/ccs.ps1
+++ b/lib/ccs.ps1
@@ -72,7 +72,7 @@ Restart your terminal after installation.
 }
 
 # Version (updated by scripts/bump-version.sh)
-$CcsVersion = "2.4.1"
+$CcsVersion = "2.4.3"
 $ScriptDir = Split-Path -Parent $MyInvocation.MyCommand.Path
 
 # Installation function for commands and skills
diff --git a/package.json b/package.json
index 4dda57cf..5d89b10a 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@kaitranntt/ccs",
-  "version": "2.4.2",
+  "version": "2.4.3",
   "description": "Claude Code Switch - Instant profile switching between Claude Sonnet 4.5 and GLM 4.6",
   "keywords": [
     "cli",