# Locking dependencies with npm shrinkwrap on Elastic Beanstalk The Node.js platform runs `npm install` as the *webapp* user each time you deploy. When new versions of your dependencies are available, they're installed when you deploy your application, potentially causing the deployment to take a long time. You can avoid upgrading dependencies by creating an `npm-shrinkwrap.json` file that locks down your application's dependencies to the current version. ``` $ npm install $ npm shrinkwrap wrote npm-shrinkwrap.json ``` Include this file in your source bundle to ensure that dependencies are only installed once.