diff --git a/aleksis/apps/alsijil/model_extensions.py b/aleksis/apps/alsijil/model_extensions.py
index 41c7c0b8836bdb3bc2b636afe9ae451593931957..bfa3dd7def75c3891f4cf32b0369ad7f6d7f0ee4 100644
--- a/aleksis/apps/alsijil/model_extensions.py
+++ b/aleksis/apps/alsijil/model_extensions.py
@@ -1,9 +1,9 @@
 from datetime import date
+from calendarweek import CalendarWeek
 
 from django.db.models import Exists, F, OuterRef
 
 from aleksis.apps.chronos.models import LessonPeriod
-from aleksis.apps.chronos.util import CalendarWeek
 from aleksis.core.models import Group, Person
 
 from .models import PersonalNote
diff --git a/aleksis/apps/alsijil/views.py b/aleksis/apps/alsijil/views.py
index ea54bc23622738a1f388f54b720d51ac161702c6..77f69af3c8ebf297e8c5e1326e3829ae108ebe86 100644
--- a/aleksis/apps/alsijil/views.py
+++ b/aleksis/apps/alsijil/views.py
@@ -1,3 +1,4 @@
+from calendarweek import CalendarWeek
 from datetime import date, datetime, timedelta
 from typing import Optional
 
@@ -12,7 +13,6 @@ from django.utils.translation import ugettext as _
 from django_tables2 import RequestConfig
 
 from aleksis.apps.chronos.models import LessonPeriod
-from aleksis.apps.chronos.util import CalendarWeek
 from aleksis.core.decorators import admin_required
 from aleksis.core.models import Group, Person, School
 from aleksis.core.util import messages