diff --git a/h_periodic/lms_beat.py b/h_periodic/lms_beat.py
index 541a0f9..c48c5d6 100644
--- a/h_periodic/lms_beat.py
+++ b/h_periodic/lms_beat.py
@@ -26,7 +26,7 @@
         "send_instructor_email_digests": {
             "task": "lms.tasks.email_digests.send_instructor_email_digest_tasks",
             "schedule": crontab(hour=7, minute=15),
-            "kwargs": {"batch_size": 25},
+            "kwargs": {"batch_size": 10},
         },
         "delete_expired_task_done_rows": {
             "task": "lms.tasks.task_done.delete_expired_rows",