diff --git a/sync/views.py b/sync/views.py
index cb5f9ad..03c7a14 100644
--- a/sync/views.py
+++ b/sync/views.py
@@ -183,7 +183,7 @@ class SynchronizationApi(HierarchyApiView):
         if not decoded_last_update:
             return Response({"error": "last_update parameter is required"}, status=status.HTTP_400_BAD_REQUEST)
         try:
-            last_update = timezone.datetime.fromisoformat(decoded_last_update)
+            last_update = timezone.datetime.fromisoformat(decoded_last_update).astimezone(timezone.utc)
         except ValueError:
             return Response({"error": f"Invalid date format for last_update: {decoded_last_update}"}, status=status.HTTP_400_BAD_REQUEST)
 
@@ -195,7 +195,7 @@ class SynchronizationApi(HierarchyApiView):
         updates = defaultdict(dict)
         deletions = defaultdict(list)
         grants = defaultdict(dict)
-        revocations = defaultdict(list)  # New dictionary for revocations
+        revocations = defaultdict(list)
         revocations_parents_organizer = HierarchyOrganizer()
 
         # revocated_parents = defaultdict(dict)