diff --git a/composer.json b/composer.json
index 8d47f359..58693170 100644
--- a/composer.json
+++ b/composer.json
@@ -43,7 +43,7 @@
         "twig/twig": "^3.0"
     },
     "require-dev": {
-        "doctrine/data-fixtures": "^1.4",
+        "doctrine/data-fixtures": "^1.6",
         "friendsofphp/php-cs-fixer": "^3.4",
         "matthiasnoback/symfony-config-test": "^4.2",
         "matthiasnoback/symfony-dependency-injection-test": "^4.1",
diff --git a/tests/App/AppKernel.php b/tests/App/AppKernel.php
index 9cfde43d..f92a56dd 100644
--- a/tests/App/AppKernel.php
+++ b/tests/App/AppKernel.php
@@ -79,6 +79,8 @@ protected function configureContainer(ContainerBuilder $container, LoaderInterfa
 
         if (!class_exists(IsGranted::class)) {
             $loader->load(__DIR__.'/config/config_symfony_v5.yaml');
+        } else {
+            $loader->load(__DIR__.'/config/config_symfony_v6.yaml');
         }
 
         if (class_exists(HttpCacheHandler::class)) {
diff --git a/tests/App/DataFixtures/MongoDB/BookFixtures.php b/tests/App/DataFixtures/MongoDB/BookFixtures.php
index 7fcd8226..39ee655e 100644
--- a/tests/App/DataFixtures/MongoDB/BookFixtures.php
+++ b/tests/App/DataFixtures/MongoDB/BookFixtures.php
@@ -24,15 +24,11 @@ final class BookFixtures extends Fixture implements DependentFixtureInterface
 {
     public function load(ObjectManager $manager): void
     {
-        $author = $this->getReference(AuthorFixtures::AUTHOR);
-
-        \assert($author instanceof Author);
+        $author = $this->getReference(AuthorFixtures::AUTHOR, Author::class);
 
         $book = new Book('book_id', 'Don Quixote', $author);
 
-        $category = $this->getReference(CategoryFixtures::CATEGORY);
-
-        \assert($category instanceof Category);
+        $category = $this->getReference(CategoryFixtures::CATEGORY, Category::class);
 
         $book->addCategory($category);
 
diff --git a/tests/App/config/config_symfony_v6.yaml b/tests/App/config/config_symfony_v6.yaml
new file mode 100644
index 00000000..09970396
--- /dev/null
+++ b/tests/App/config/config_symfony_v6.yaml
@@ -0,0 +1,11 @@
+framework:
+    annotations: false
+    handle_all_throwables: true
+    php_errors:
+        log: true
+    session:
+        cookie_secure: auto
+        cookie_samesite: lax
+        handler_id: null
+    validation:
+        email_validation_mode: html5