diff --git a/backend/scheduler.py b/backend/scheduler.py
index 22d1533..f0487c8 100644
--- a/backend/scheduler.py
+++ b/backend/scheduler.py
@@ -54,7 +54,7 @@ def start():
     )
     _scheduler.add_job(
         _job_import_events,
-        CronTrigger(day_of_week='sun', hour=2),  # jeden Sonntag 02:00 Uhr
+        CronTrigger(month="1,4,7,10", day=2, hour=2),  # quartalsweise Jan/Apr/Jul/Okt
         id="import_events",
         replace_existing=True,
         misfire_grace_time=7200,