diff --git a/aleksis/apps/lesrooster/models.py b/aleksis/apps/lesrooster/models.py
index 307c461041072298fe9b60e08c2d2f4ca9478b0e..7fb31117072095bfff573ac26fd24cbb211a8a6b 100644
--- a/aleksis/apps/lesrooster/models.py
+++ b/aleksis/apps/lesrooster/models.py
@@ -1,6 +1,7 @@
 import logging
+from collections.abc import Sequence
 from datetime import date, datetime, timedelta
-from typing import Optional, Sequence, Union
+from typing import Optional, Union
 
 from django.core.exceptions import ValidationError
 from django.db import models