diff --git a/aleksis/apps/chronos/schema/__init__.py b/aleksis/apps/chronos/schema/__init__.py
index 253f56f183a9391bebf1cc2c4b1322864a4de48b..279003489d17818eda4487867de799fb1eeef213 100644
--- a/aleksis/apps/chronos/schema/__init__.py
+++ b/aleksis/apps/chronos/schema/__init__.py
@@ -2,13 +2,13 @@ from datetime import timezone
 
 import graphene
 from graphene_django import DjangoObjectType
-from graphene_django_cud.mutations import (
-    DjangoBatchCreateMutation,
-    DjangoBatchDeleteMutation,
-    DjangoBatchPatchMutation,
-)
 
 from aleksis.core.models import Group, Person, Room
+from aleksis.core.schema.base import (
+    BaseBatchCreateMutation,
+    BaseBatchDeleteMutation,
+    BaseBatchPatchMutation,
+)
 
 from ..models import LessonEvent
 from ..util.chronos_helpers import get_groups, get_rooms, get_teachers
@@ -80,7 +80,7 @@ class DatetimeTimezoneMixin:
         return value
 
 
-class AmendLessonBatchCreateMutation(DatetimeTimezoneMixin, DjangoBatchCreateMutation):
+class AmendLessonBatchCreateMutation(DatetimeTimezoneMixin, BaseBatchCreateMutation):
     class Meta:
         model = LessonEvent
         permissions = ("chronos.edit_substitution_rule",)
@@ -98,12 +98,13 @@ class AmendLessonBatchCreateMutation(DatetimeTimezoneMixin, DjangoBatchCreateMut
 
     @classmethod
     def before_save(cls, root, info, input, created_objects):  # noqa: A002
+        super().before_save(root, info, input, created_objects)
         for obj in created_objects:
             obj.timezone = obj.amends.timezone
         return created_objects
 
 
-class AmendLessonBatchPatchMutation(DatetimeTimezoneMixin, DjangoBatchPatchMutation):
+class AmendLessonBatchPatchMutation(DatetimeTimezoneMixin, BaseBatchPatchMutation):
     class Meta:
         model = LessonEvent
         permissions = ("chronos.edit_substitution_rule",)
@@ -111,12 +112,13 @@ class AmendLessonBatchPatchMutation(DatetimeTimezoneMixin, DjangoBatchPatchMutat
 
     @classmethod
     def before_save(cls, root, info, input, updated_objects):  # noqa: A002
+        super().before_save(root, info, input, updated_objects)
         for obj in updated_objects:
             obj.timezone = obj.amends.timezone
         return updated_objects
 
 
-class AmendLessonBatchDeleteMutation(DjangoBatchDeleteMutation):
+class AmendLessonBatchDeleteMutation(BaseBatchDeleteMutation):
     class Meta:
         model = LessonEvent
         permissions = ("chronos.delete_substitution_rule",)