# composer > A package-based dependency manager for PHP projects. > More information: . - Add a package as a dependency for this project, adding it to `composer.json`: `composer require {{user/package_name}}` - Install all the dependencies in this project's `composer.json`: `composer install` - Uninstall a package from this project, removing it as a dependency from `composer.json`: `composer remove {{user/package_name}}` - Update all the dependencies in this project's `composer.json`: `composer update` - Update composer to the latest version: `composer self-update`