diff --git a/backend/dvadmin/utils/serializers.py b/backend/dvadmin/utils/serializers.py
index 8ab54ff..5ee5ed2 100644
--- a/backend/dvadmin/utils/serializers.py
+++ b/backend/dvadmin/utils/serializers.py
@@ -68,7 +68,7 @@ class CustomModelSerializer(DynamicFieldsMixin,ModelSerializer):
     def update(self, instance, validated_data):
         if self.request:
             if hasattr(self.instance, self.modifier_field_id):
-                self.instance.modifier = self.get_request_username()
+                self.instance[self.modifier_field_id] = self.get_request_user_id()
         return super().update(instance, validated_data)
 
     def get_request_username(self):