diff --git a/changelog.md b/changelog.md
index e9d2561..70b5893 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,5 +1,14 @@
 # Changelog
 
+## 2025-03-26 - 2.6.4 - fix(setup)
+Improve installation process in setup script by cleaning up package files and ensuring a minimal net-snmp dependency installation.
+
+- Remove existing package-lock.json along with node_modules to prevent stale artifacts.
+- Back up the original package.json before modifying it.
+- Create a minimal package.json with only the net-snmp dependency based on the backed-up version.
+- Use a clean install to guarantee that only net-snmp is installed.
+- Restore the original package.json if the installation fails.
+
 ## 2025-03-26 - 2.6.3 - fix(setup)
 Update setup script to install only net-snmp dependency and create a minimal package-lock.json for better dependency control.
 
diff --git a/setup.sh b/setup.sh
index 3ddb31c..e25f991 100644
--- a/setup.sh
+++ b/setup.sh
@@ -244,48 +244,61 @@ NODE_BIN_DIR="$SCRIPT_DIR/vendor/$NODE_DIR/bin"
 OLD_PATH="$PATH"
 export PATH="$NODE_BIN_DIR:$PATH"
 
-# Remove existing node_modules directory
-echo "Removing existing node_modules directory..."
+# Remove existing node_modules directory and package files
+echo "Cleaning up existing installation..."
 rm -rf "$SCRIPT_DIR/node_modules"
+rm -f "$SCRIPT_DIR/package-lock.json"
 
-# Install ONLY the net-snmp production dependency
-echo "Installing ONLY net-snmp production dependency..."
+# Back up existing package.json if it exists
+if [ -f "$SCRIPT_DIR/package.json" ]; then
+  echo "Backing up existing package.json..."
+  cp "$SCRIPT_DIR/package.json" "$SCRIPT_DIR/package.json.bak"
+fi
+
+# Create a clean minimal package.json with ONLY net-snmp dependency
+echo "Creating minimal package.json with only net-snmp dependency..."
+VERSION=$(grep -o '"version": "[^"]*"' "$SCRIPT_DIR/package.json.bak" | head -1 | cut -d'"' -f4 || echo "2.6.3")
+echo '{
+  "name": "@serve.zone/nupst",
+  "version": "'$VERSION'",
+  "description": "Node.js UPS Shutdown Tool for SNMP-enabled UPS devices",
+  "main": "dist_ts/index.js",
+  "type": "module",
+  "bin": {
+    "nupst": "bin/nupst"
+  },
+  "dependencies": {
+    "net-snmp": "3.20.0"
+  },
+  "engines": {
+    "node": ">=16.0.0"
+  },
+  "private": true
+}' > "$SCRIPT_DIR/package.json"
+
+# Install ONLY net-snmp
+echo "Installing ONLY net-snmp dependency..."
 echo "Using Node.js binary from: $NODE_BIN_DIR"
 echo "Node version: $(node --version)"
 echo "NPM version: $(npm --version)"
 
-# Install just net-snmp directly, don't rely on package.json
-npm --prefix "$SCRIPT_DIR" install --no-save net-snmp@3.20.0 --no-audit --no-fund
-
-# Verify only net-snmp is installed
-echo "Verifying only net-snmp is installed in node_modules..."
-find "$SCRIPT_DIR/node_modules" -maxdepth 1 -type d | sort
+# Use clean install to ensure only net-snmp is installed
+npm --prefix "$SCRIPT_DIR" install --no-audit --no-fund
 
 INSTALL_STATUS=$?
 if [ $INSTALL_STATUS -ne 0 ]; then
   echo "Error: Failed to install net-snmp dependency. NUPST may not function correctly."
-  echo "You can try to install dependencies manually by running:"
-  echo "cd $SCRIPT_DIR && npm install net-snmp@3.20.0"
+  echo "Restoring original package.json..."
+  mv "$SCRIPT_DIR/package.json.bak" "$SCRIPT_DIR/package.json"
+  exit 1
 else
   echo "net-snmp dependency installed successfully."
+  # Show what's actually installed
+  echo "Installed modules:"
+  find "$SCRIPT_DIR/node_modules" -maxdepth 1 -type d | grep -v "^$SCRIPT_DIR/node_modules$" | sort
   
-  # Create minimal package-lock.json if it doesn't exist
-  if [ ! -f "$SCRIPT_DIR/package-lock.json" ]; then
-    echo "Creating minimal package-lock.json..."
-    echo '{
-  "name": "@serve.zone/nupst",
-  "version": "2.6.2",
-  "lockfileVersion": 2,
-  "requires": true,
-  "packages": {
-    "": {
-      "dependencies": {
-        "net-snmp": "3.20.0"
-      }
-    }
-  }
-}' > "$SCRIPT_DIR/package-lock.json"
-  fi
+  # Remove backup if successful
+  rm -f "$SCRIPT_DIR/package.json.bak"
 fi
 
 # Restore the original PATH
diff --git a/ts/00_commitinfo_data.ts b/ts/00_commitinfo_data.ts
index a16e6bf..6f16b2e 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: '2.6.3',
+  version: '2.6.4',
   description: 'Node.js UPS Shutdown Tool for SNMP-enabled UPS devices'
 }