As of v2.0.0, support for PHP 7.3 and 7.4 is removed, so you'll need to use at least PHP 8.0.
As of v2.0.0, support for Laravel 6 and 7 is removed, so you'll need to use at least Laravel 8.
In previous versions of Laravel Config Validator, the config rules were stored by default in your Laravel application in a config/validation folder. This meant that if you ran the artisan config:cache command, an exception would be thrown because Laravel would attempt to cache your config validation rules.
So, as of v2.0.0, the default location has been moved from config/validation to config-validation in your project's root.
If you have any existing rules in your project, please make sure to move them to this new folder.