diff --git a/Tests/Functional/TestKernel.php b/Tests/Functional/TestKernel.php
index 74de9ec..a865e78 100644
--- a/Tests/Functional/TestKernel.php
+++ b/Tests/Functional/TestKernel.php
@@ -31,7 +31,6 @@ use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Definition;
 use Symfony\Component\HttpKernel\Kernel;
 use Symfony\Component\Routing\Loader\Configurator\RoutingConfigurator;
-use Symfony\Component\Routing\RouteCollectionBuilder;
 use Symfony\Component\Serializer\Annotation\SerializedName;
 
 class TestKernel extends Kernel
@@ -112,7 +111,8 @@ class TestKernel extends Kernel
     /**
      * BC for sf < 5.1.
      */
-    private function import($routes, $resource, $prefix, $type) {
+    private function import($routes, $resource, $prefix, $type)
+    {
         if ($routes instanceof RoutingConfigurator) {
             $routes->withPath($prefix)->import($resource, $type);
         } else {
diff --git a/Tests/Functional/WebTestCase.php b/Tests/Functional/WebTestCase.php
index c792c0d..54bfdde 100644
--- a/Tests/Functional/WebTestCase.php
+++ b/Tests/Functional/WebTestCase.php
@@ -14,6 +14,7 @@ namespace Nelmio\ApiDocBundle\Tests\Functional;
 use OpenApi\Annotations as OA;
 use OpenApi\Generator;
 use Symfony\Bundle\FrameworkBundle\Test\WebTestCase as BaseWebTestCase;
+use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\HttpKernel\KernelInterface;
 
 class WebTestCase extends BaseWebTestCase
@@ -168,4 +169,16 @@ class WebTestCase extends BaseWebTestCase
             sprintf('Failed asserting that property "%s" does not exist.', $property)
         );
     }
+
+    /**
+     * BC symfony < 5.3
+     */
+    protected static function getContainer(): ContainerInterface
+    {
+        if (method_exists(parent::class, 'getContainer')) {
+            return parent::getContainer();
+        }
+
+        return static::$container;
+    }
 }