diff --git a/changelog.md b/changelog.md
index 1163481..5bfe06d 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## 2025-03-26 - 2.6.6 - fix(setup.sh)
+Improve setup script to detect and execute npm-cli.js directly using the Node.js binary
+
+- Replace use of the npm binary with direct execution of npm-cli.js
+- Add fallback logic to locate npm-cli.js when not found at the expected path
+- Simplify cleanup by removing unnecessary PATH modifications
+
 ## 2025-03-26 - 2.6.5 - fix(daemon, setup)
 Improve shutdown command detection and fallback logic; update setup script to use absolute Node/npm paths
 
diff --git a/setup.sh b/setup.sh
index 2619081..923c074 100644
--- a/setup.sh
+++ b/setup.sh
@@ -239,20 +239,31 @@ echo "dist_ts directory successfully downloaded from npm registry."
 # Make launcher script executable
 chmod +x "$SCRIPT_DIR/bin/nupst"
 
-# Set path to our Node.js binaries
+# Set up Node.js binary path
 NODE_BIN_DIR="$SCRIPT_DIR/vendor/$NODE_DIR/bin"
 NODE_BIN="$NODE_BIN_DIR/node"
-NPM_BIN="$NODE_BIN_DIR/npm"
+NPM_CLI_JS="$NODE_BIN_DIR/../lib/node_modules/npm/bin/npm-cli.js"
 
 # Ensure we have executable permissions
-chmod +x "$NODE_BIN" "$NPM_BIN"
+chmod +x "$NODE_BIN"
 
-# Save original PATH but don't modify it
-# We'll use the full paths to binaries instead
-OLD_PATH="$PATH"
+# Make sure the npm-cli.js exists
+if [ ! -f "$NPM_CLI_JS" ]; then
+  # Try to find npm-cli.js
+  NPM_CLI_JS=$(find "$NODE_BIN_DIR/.." -name "npm-cli.js" | head -1)
+  
+  if [ -z "$NPM_CLI_JS" ]; then
+    echo "Warning: Could not find npm-cli.js, npm commands may fail"
+    # Set to a fallback value so code can continue
+    NPM_CLI_JS="$NODE_BIN_DIR/npm"
+  else
+    echo "Found npm-cli.js at: $NPM_CLI_JS"
+  fi
+fi
 
+# Display which binaries we're using
 echo "Using Node binary: $NODE_BIN"
-echo "Using NPM binary: $NPM_BIN"
+echo "Using NPM CLI JS: $NPM_CLI_JS"
 
 # Remove existing node_modules directory and package files
 echo "Cleaning up existing installation..."
@@ -289,10 +300,10 @@ echo '{
 # Install ONLY net-snmp
 echo "Installing ONLY net-snmp dependency..."
 echo "Node version: $("$NODE_BIN" --version)"
-echo "NPM version: $("$NPM_BIN" --version)"
+echo "Executing NPM directly with Node.js"
 
-# Use absolute paths to binaries to ensure we use our Node.js
-"$NPM_BIN" --prefix "$SCRIPT_DIR" install --no-audit --no-fund
+# Execute npm-cli.js directly with our Node.js binary
+"$NODE_BIN" "$NPM_CLI_JS" --prefix "$SCRIPT_DIR" install --no-audit --no-fund
 
 INSTALL_STATUS=$?
 if [ $INSTALL_STATUS -ne 0 ]; then
@@ -310,7 +321,7 @@ else
   rm -f "$SCRIPT_DIR/package.json.bak"
 fi
 
-# We didn't modify PATH, so no need to restore it
+# No temporary files to clean up
 
 echo "NUPST setup completed successfully."
 echo "You can now run NUPST using: $SCRIPT_DIR/bin/nupst"
diff --git a/ts/00_commitinfo_data.ts b/ts/00_commitinfo_data.ts
index 121594a..d7f19d5 100644
--- a/ts/00_commitinfo_data.ts
+++ b/ts/00_commitinfo_data.ts
@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@serve.zone/nupst',
-  version: '2.6.5',
+  version: '2.6.6',
   description: 'Node.js UPS Shutdown Tool for SNMP-enabled UPS devices'
 }