You should update the following dependencies in your application's composer.json file:
laravel/framework to ^9.0
nunomaduro/collision to ^6.1
In addition, please replace facade/ignition with "spatie/laravel-ignition": "^1.0" and pusher/pusher-php-server (if applicable) with "pusher/pusher-php-server": "^5.0" in your application's composer.json file.
Furthermore, the following first-party packages have received new major releases to support Laravel 9.x. If applicable, you should read their individual upgrade guides before upgrading: