Dimensions validation rule cannot find validateDimensions

I'm trying to use the image dimensions validation rule for uploaded images inside a controller:

namespace App\Http\Controllers;

use App\ClassCategory;
use App\Http\Requests;
use Illuminate\Http\Request;
use Symfony\Component\HttpFoundation\File\UploadedFile;
use Validator;

class ClassCategoryController extends Controller {
  public function store(Request $request) {
    $validator = Validator::make($request->all(), [
      'image' => 'dimensions:min_width=300,min_height=300'
    ]);

    if ($validator->fails()) { // This is where the expection is thrown.
      // ...
    }
  }
}

But it throws the following exception:

BadMethodCallException in Validator.php line 3181:
Method [validateDimensions] does not exist.

in Validator.php line 3181
at Validator->__call('validateDimensions', array('image', 'ballet.jpg', array('min_width=100', 'min_height=200'), object(Validator))) in Validator.php line 484
at Validator->validate('image', 'Dimensions') in Validator.php line 424
at Validator->passes() in Validator.php line 449
at Validator->fails() in ClassCategoryController.php line 42
at ClassCategoryController->store(object(Request))
at call_user_func_array(array(object(ClassCategoryController), 'store'), array(object(Request))) in Controller.php line 80
at Controller->callAction('store', array(object(Request))) in ControllerDispatcher.php line 146
at ControllerDispatcher->call(object(ClassCategoryController), object(Route), 'store') in ControllerDispatcher.php line 94
at ControllerDispatcher->Illuminate\Routing\{closure}(object(Request))
at call_user_func(object(Closure), object(Request)) in Pipeline.php line 52
...

The class Controller uses Illuminate\Foundation\Validation\ValidatesRequests. What am I missing here?

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