misc_pterodactyl-panel/app/Http/Requests/Api/Application/Users/UpdateUserRequest.php

<?php

namespace Pterodactyl\Http\Requests\Api\Application\Users;

use Pterodactyl\Models\User;

class UpdateUserRequest extends StoreUserRequest
{
    public function rules(array $rules = null): array
    {
        return parent::rules($rules ?? User::getRulesForUpdate($this->route()->parameter('user')->id));
    }
}