diff --git a/backend/app/Auth/EloquentSessionRepository.php b/backend/app/Auth/EloquentSessionRepository.php
index 5c038d4..fd2ad3a 100644
--- a/backend/app/Auth/EloquentSessionRepository.php
+++ b/backend/app/Auth/EloquentSessionRepository.php
@@ -3,7 +3,6 @@
 namespace App\Auth;
 
 use App\User\UserRepository;
-use Carbon\CarbonInterface;
 use DateTimeImmutable;
 use DateTimeZone;
 
@@ -55,7 +54,7 @@ class EloquentSessionRepository implements SessionRepository
         SessionModel::where('token', $token)->delete();
     }
 
-    private function toUtc(CarbonInterface $dateTime): DateTimeImmutable
+    private function toUtc(DateTimeImmutable $dateTime): DateTimeImmutable
     {
         return DateTimeImmutable::createFromInterface($dateTime)
             ->setTimezone(new DateTimeZone('UTC'));
diff --git a/backend/app/Auth/SessionModel.php b/backend/app/Auth/SessionModel.php
index 0b5092c..37b30cb 100644
--- a/backend/app/Auth/SessionModel.php
+++ b/backend/app/Auth/SessionModel.php
@@ -2,7 +2,7 @@
 
 namespace App\Auth;
 
-use Carbon\CarbonInterface;
+use DateTimeImmutable;
 use Illuminate\Database\Eloquent\Attributes\Fillable;
 use Illuminate\Database\Eloquent\Builder;
 use Illuminate\Database\Eloquent\Model;
@@ -10,8 +10,8 @@ use Illuminate\Database\Eloquent\Model;
 /**
  * @property string $token
  * @property int $user_id
- * @property CarbonInterface $created_at
- * @property CarbonInterface $expires_at
+ * @property DateTimeImmutable $created_at
+ * @property DateTimeImmutable $expires_at
  *
  * @method static Builder<static>|SessionModel newModelQuery()
  * @method static Builder<static>|SessionModel newQuery()