diff --git a/setup.py b/setup.py
index c0d63092..c7d2191d 100644
--- a/setup.py
+++ b/setup.py
@@ -17,7 +17,7 @@
     'django-select2',
     'djangorestframework<3.15.2',
     'drf-extensions>=0.5.0',
-    'icalendar>=4.0',
+    'icalendar>=6.0',
     'jsonfield',
     'markdown>=2.5',
     'pillow',
diff --git a/wafer/schedule/tests/test_views.py b/wafer/schedule/tests/test_views.py
index 691e80c4..49cee54f 100644
--- a/wafer/schedule/tests/test_views.py
+++ b/wafer/schedule/tests/test_views.py
@@ -1749,8 +1749,8 @@ def test_ics_view(self):
         response = c.get('/schedule/schedule.ics')
         self.assertIn('Last-Modified', response)
         calendar = icalendar.Calendar.from_ical(response.content)
-        # No major errors
-        self.assertFalse(calendar.is_broken)
+        # No errors reported
+        self.assertEqual(len(calendar.errors), 0)
         # Check number of events
         self.assertEqual(len(calendar.walk(name='VEVENT')), 9)
         # Check we have the right time in places