Packagist is the main Composer repository. It aggregates public PHP packages installable with Composer. Define Your Dependencies Put a file named composer.json at the root of your project, containing your project dependencies: { "require": { "vendor/package": "1.3.2", "vendor/package2": "1.*", "vendor/package3": "^2.0.3" } } For more information about packages versions usage, see the composer docu