diff --git a/DoctrineBundle.php b/DoctrineBundle.php
index 6725c618..9926beab 100644
--- a/DoctrineBundle.php
+++ b/DoctrineBundle.php
@@ -13,9 +13,9 @@
 use Doctrine\Bundle\DoctrineBundle\DependencyInjection\Compiler\RemoveProfilerControllerPass;
 use Doctrine\Bundle\DoctrineBundle\DependencyInjection\Compiler\ServiceRepositoryCompilerPass;
 use Doctrine\Bundle\DoctrineBundle\DependencyInjection\Compiler\WellKnownSchemaFilterPass;
-use Doctrine\Common\Util\ClassUtils;
 use Doctrine\ORM\EntityManagerInterface;
 use Doctrine\ORM\Proxy\Autoloader;
+use Doctrine\ORM\Proxy\DefaultProxyClassNameResolver;
 use Symfony\Bridge\Doctrine\DependencyInjection\CompilerPass\DoctrineValidationPass;
 use Symfony\Bridge\Doctrine\DependencyInjection\CompilerPass\RegisterEventListenersAndSubscribersPass;
 use Symfony\Bridge\Doctrine\DependencyInjection\CompilerPass\RegisterUidTypePass;
@@ -101,7 +101,7 @@ public function boot()
             $container = &$this->container;
 
             $proxyGenerator = static function ($proxyDir, $proxyNamespace, $class) use (&$container): void {
-                $originalClassName = ClassUtils::getRealClass($class);
+                $originalClassName = (new DefaultProxyClassNameResolver())->resolveClassName($class);
                 $registry          = $container->get('doctrine');
                 assert($registry instanceof Registry);
 
diff --git a/composer.json b/composer.json
index 6af31dc4..38692af1 100644
--- a/composer.json
+++ b/composer.json
@@ -48,7 +48,7 @@
         "doctrine/annotations": "^1 || ^2",
         "doctrine/coding-standard": "^12",
         "doctrine/deprecations": "^1.0",
-        "doctrine/orm": "^2.14 || ^3.0",
+        "doctrine/orm": "^2.17 || ^3.0",
         "friendsofphp/proxy-manager-lts": "^1.0",
         "phpunit/phpunit": "^9.5.26",
         "psalm/plugin-phpunit": "^0.18.4",
@@ -69,7 +69,7 @@
     },
     "conflict": {
         "doctrine/annotations": ">=3.0",
-        "doctrine/orm": "<2.14 || >=4.0",
+        "doctrine/orm": "<2.17 || >=4.0",
         "twig/twig": "<1.34 || >=2.0 <2.4"
     },
     "suggest": {