diff --git a/src/Entity/Scope.php b/src/Entity/Scope.php
index 08a9c168..ad61965f 100644
--- a/src/Entity/Scope.php
+++ b/src/Entity/Scope.php
@@ -12,7 +12,7 @@ final class Scope implements ScopeEntityInterface
     use EntityTrait;
 
     #[\ReturnTypeWillChange]
-    public function jsonSerialize()
+    public function jsonSerialize(): mixed
     {
         return $this->getIdentifier();
     }
diff --git a/tests/Acceptance/AbstractAcceptanceTest.php b/tests/Acceptance/AbstractAcceptanceTest.php
index 18624c28..23509d50 100644
--- a/tests/Acceptance/AbstractAcceptanceTest.php
+++ b/tests/Acceptance/AbstractAcceptanceTest.php
@@ -4,6 +4,7 @@
 
 namespace League\Bundle\OAuth2ServerBundle\Tests\Acceptance;
 
+use Doctrine\DBAL\Platforms\SqlitePlatform;
 use League\Bundle\OAuth2ServerBundle\Tests\TestHelper;
 use Symfony\Bundle\FrameworkBundle\Console\Application;
 use Symfony\Bundle\FrameworkBundle\KernelBrowser;
@@ -30,7 +31,7 @@ protected function setUp(): void
         TestHelper::initializeDoctrineSchema($this->application);
 
         $connection = $this->client->getContainer()->get('database_connection');
-        if ('sqlite' === $connection->getDatabasePlatform()->getName()) {
+        if ($connection->getDatabasePlatform() instanceof SqlitePlatform) {
             // https://www.sqlite.org/foreignkeys.html
             $connection->executeQuery('PRAGMA foreign_keys = ON');
         }
diff --git a/tests/Fixtures/User.php b/tests/Fixtures/User.php
index 43702bf7..277db961 100644
--- a/tests/Fixtures/User.php
+++ b/tests/Fixtures/User.php
@@ -33,7 +33,7 @@ public function getUserIdentifier(): string
         return FixtureFactory::FIXTURE_USER;
     }
 
-    public function eraseCredentials()
+    public function eraseCredentials(): void
     {
     }
 }
diff --git a/tests/TestKernel.php b/tests/TestKernel.php
index 12abdec2..acfc1a2a 100644
--- a/tests/TestKernel.php
+++ b/tests/TestKernel.php
@@ -5,6 +5,7 @@
 namespace League\Bundle\OAuth2ServerBundle\Tests;
 
 use Doctrine\DBAL\Platforms\SqlitePlatform;
+use Doctrine\ORM\Configuration as OrmConfiguration;
 use League\Bundle\OAuth2ServerBundle\Manager\AccessTokenManagerInterface;
 use League\Bundle\OAuth2ServerBundle\Manager\AuthorizationCodeManagerInterface;
 use League\Bundle\OAuth2ServerBundle\Manager\ClientManagerInterface;
@@ -20,7 +21,7 @@
 
 final class TestKernel extends Kernel implements CompilerPassInterface
 {
-    public function boot()
+    public function boot(): void
     {
         $this->initializeEnvironmentVariables();
 
@@ -47,27 +48,31 @@ public function getLogDir(): string
         return sprintf('%s/tests/.kernel/logs', $this->getProjectDir());
     }
 
-    public function process(ContainerBuilder $container)
+    public function process(ContainerBuilder $container): void
     {
         $this->exposeManagerServices($container);
     }
 
-    public function registerContainerConfiguration(LoaderInterface $loader)
+    public function registerContainerConfiguration(LoaderInterface $loader): void
     {
         $loader->load(function (ContainerBuilder $container) {
-            $container->loadFromExtension('doctrine', [
+            $doctrine = [
                 'dbal' => [
-                    'driver' => 'sqlite',
+                    'driver' => 'pdo_sqlite',
                     'charset' => 'utf8mb4',
                     'url' => 'sqlite:///:memory:',
                     'default_table_options' => [
                         'charset' => 'utf8mb4',
                         'utf8mb4_unicode_ci' => 'utf8mb4_unicode_ci',
                     ],
-                    'platform_service' => SqlitePlatform::class,
                 ],
-                'orm' => null,
-            ]);
+            ];
+
+            if (method_exists(OrmConfiguration::class, 'setLazyGhostObjectEnabled')) {
+                $doctrine['orm'] = ['enable_lazy_ghost_objects'=> true];
+            }
+
+            $container->loadFromExtension('doctrine', $doctrine);
 
             $container->loadFromExtension('framework', [
                 'secret' => 'nope',