diff --git a/plinth/tests/data/django_test_settings.py b/plinth/tests/data/django_test_settings.py
index 1cc2f15a3..0f742f4e3 100644
--- a/plinth/tests/data/django_test_settings.py
+++ b/plinth/tests/data/django_test_settings.py
@@ -56,3 +56,7 @@ TEMPLATES = [{
     'APP_DIRS': True,
     'DIRS': ['plinth/tests/data/templates/'],
 }]
+
+TIME_ZONE = 'UTC'
+
+USE_TZ = True
diff --git a/plinth/tests/test_notification.py b/plinth/tests/test_notification.py
index 6af90bc7f..cd72755c0 100644
--- a/plinth/tests/test_notification.py
+++ b/plinth/tests/test_notification.py
@@ -386,7 +386,7 @@ def test_display_context(gettext, note, user, rf):
     assert context_note['actions'] == expected_actions
     assert context_note['data'] == expected_data
     assert note.data == data
-    now = datetime.datetime.now()
+    now = datetime.datetime.now(datetime.timezone.utc)
     assert (now - context_note['created_time']).seconds < 60
     assert (now - context_note['last_update_time']).seconds < 60
     assert context_note['user'] == 'test-user'