diff --git a/composer.json b/composer.json
index 92bec45..569f94c 100644
--- a/composer.json
+++ b/composer.json
@@ -22,7 +22,8 @@
     "require": {
         "php": "^8.1",
         "contao/core-bundle": "^4.13 || ^5.0",
-        "symfony/mime": "^5.4 || ^6.0 || ^7.0"
+        "symfony/mime": "^5.4 || ^6.0 || ^7.0",
+        "symfony/security-core": "^5.4 || ^6.0 || ^7.0"
     },
     "require-dev": {
         "contao/manager-plugin": "^2.0",
diff --git a/src/DoctrineOrmHelper.php b/src/DoctrineOrmHelper.php
index 7c5fa68..86490c4 100644
--- a/src/DoctrineOrmHelper.php
+++ b/src/DoctrineOrmHelper.php
@@ -11,7 +11,7 @@
 use Doctrine\DBAL\Connection;
 use Doctrine\Persistence\ObjectManager;
 use Symfony\Component\Routing\RouterInterface;
-use Symfony\Component\Security\Core\Security;
+use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
 
 class DoctrineOrmHelper
 {
@@ -27,7 +27,7 @@ public function __construct(
         private readonly Connection $connection,
         private readonly DcaRelationsManager $dcaRelationsManager,
         private readonly RouterInterface $router,
-        private readonly Security $security,
+        private readonly TokenStorageInterface $tokenStorage,
     ) {
     }
 
@@ -82,7 +82,7 @@ public function createObjectVersion(ObjectManager $objectManager, object $entity
         $versions = new Versions($objectManager->getClassMetadata($entity::class)->getTableName(), $entity->getId());
 
         // Set the frontend user, if any
-        if (($user = $this->security->getUser()) instanceof FrontendUser) {
+        if (($user = $this->tokenStorage->getToken()?->getUser()) instanceof FrontendUser) {
             $versions->setUsername($user->username);
             $versions->setUserId(0);
         }
diff --git a/src/EventListener/DcaAjaxOperationsListener.php b/src/EventListener/DcaAjaxOperationsListener.php
index 81d83ee..1f82d56 100644
--- a/src/EventListener/DcaAjaxOperationsListener.php
+++ b/src/EventListener/DcaAjaxOperationsListener.php
@@ -23,7 +23,7 @@
 use Symfony\Component\Asset\Packages;
 use Symfony\Component\HttpFoundation\JsonResponse;
 use Symfony\Component\HttpFoundation\RequestStack;
-use Symfony\Component\Security\Core\Security;
+use Symfony\Component\Security\Core\Authorization\AuthorizationCheckerInterface;
 
 class DcaAjaxOperationsListener
 {
@@ -32,7 +32,7 @@ public function __construct(
         private readonly Packages $packages,
         private readonly RequestStack $requestStack,
         private readonly ScopeMatcher $scopeMatcher,
-        private readonly Security $security,
+        private readonly AuthorizationCheckerInterface $security,
         private readonly ContaoCsrfTokenManager $tokenManager,
     ) {
     }