use Symfony\Bundle\FrameworkBundle\Kernel\MicroKernelTrait;
 use Symfony\Component\HttpKernel\Kernel;
-use Symfony\Component\Routing\RouteCollectionBuilder;
+use Symfony\Component\Routing\Loader\Configurator\RoutingConfigurator;

 final class ConcreteMicroKernel extends Kernel
 {
     use MicroKernelTrait;

-    protected function configureRoutes(RouteCollectionBuilder $routes)
+    protected function configureRouting(RoutingConfigurator $routes): void
     {
-        $routes->add('/admin', 'App\Controller\AdminController::dashboard', 'admin_dashboard');
-    }
-}
+        $routes->add('admin_dashboard', '/admin')
+            ->controller('App\Controller\AdminController::dashboard')
+    }}