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# Upgrade guide

In the `4.x` version, we have introduced the contract concept to the Tenant so that any model could implement the interface.

The first step to reach our goal is upgrading our package version.

```bash
composer require spatie/laravel-multitenancy:^4.0
```

#### Removed `UsesTenantModel` trait

Remove any reference to our old trait `Spatie\Models\Concerns\UsesTenantModel`, because now the right `Tenant` instance can be resolved using `app(IsTenant::class)`.

#### Tenant finder

If you are using the default finder included in the package, no changes are required by your side. However, when you are using a custom finder, you need to change the returned value in `findForRequest` method to `?IsTenant`. Example:

```php
use Illuminate\Http\Request;
use Spatie\Multitenancy\Contracts\IsTenant;

class YourCustomTenantFinder extends TenantFinder
{
    public function findForRequest(Request $request): ?IsTenant
    {
        // ...
    }
}
```

#### Custom tasks

As has already been pointed out for the finder, the same change is required for any task because our `SwitchTenantTask` interface now is:

```php
public function makeCurrent(IsTenant $tenant): void;
```

So, it requires replacing the method parameter from `Tenant $tenant` to `IsTenant $tenant.`


---

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