For Laravel 7 run:
composer require "codebot/entrust": "^7.0"
For Laravel 8 run:
composer require "codebot/entrust": "^8.0"
Click here for the full documentation.
I've updated dependencies only, because I had to upgrade existing Laravel project. Do not use this package for new projects, it's abandoned at this moment. spatie/laravel-permission should be a good choice.