diff --git a/app/dao/inbound_sms_dao.py b/app/dao/inbound_sms_dao.py
index ba17ddd26..aea4af653 100644
--- a/app/dao/inbound_sms_dao.py
+++ b/app/dao/inbound_sms_dao.py
@@ -102,7 +102,7 @@ def _delete_inbound_sms(datetime_to_delete_from, query_filter):
     while number_deleted > 0:
         _insert_inbound_sms_history(subquery, query_limit=query_limit)
 
-        number_deleted = InboundSms.query.filter(InboundSms.id.in_(subquery)).delete(synchronize_session='fetch')
+        number_deleted = InboundSms.query.filter(InboundSms.id.in_(subquery)).delete(synchronize_session=False)
         deleted += number_deleted
 
     return deleted
diff --git a/app/dao/notifications_dao.py b/app/dao/notifications_dao.py
index 3b313a0df..fa046145d 100644
--- a/app/dao/notifications_dao.py
+++ b/app/dao/notifications_dao.py
@@ -377,7 +377,7 @@ def _delete_notifications(notification_type, date_to_delete_from, service_id):
         Notification.notification_type == notification_type,
         Notification.service_id == service_id,
         Notification.created_at < date_to_delete_from,
-    ).delete()
+    ).delete(synchronize_session=False)
     db.session.commit()
 
     return deleted