diff --git a/gvaldap/gvaldap/settings/base.py b/gvaldap/gvaldap/settings/base.py
index 2027ebb..de70798 100644
--- a/gvaldap/gvaldap/settings/base.py
+++ b/gvaldap/gvaldap/settings/base.py
@@ -294,7 +294,9 @@ CELERY_ROUTES = (
     'gvacommon.celeryrouters.LdapRouter',
     'gvacommon.celeryrouters.FileRouter',
 )
-CELERY_ACCEPT_CONTENT = ['pickle', 'yaml', 'json']
+CELERY_TIMEZONE = 'Europe/Berlin'
+CELERY_ENABLE_UTC = True
+CELERY_ACCEPT_CONTENT = ['json']
 CELERY_TASK_SERAILIZER = 'json'
 CELERY_RESULT_SERIALIZER = 'json'
 ########## END CELERY CONFIGURATION