diff --git a/addons/google_calendar/utils/google_calendar.py b/addons/google_calendar/utils/google_calendar.py
index b02019cb846..f1abb8cb4be 100644
--- a/addons/google_calendar/utils/google_calendar.py
+++ b/addons/google_calendar/utils/google_calendar.py
@@ -67,7 +67,7 @@ class GoogleCalendarService():
 
     @requires_auth_token
     def insert(self, values, token=None, timeout=TIMEOUT):
-        url = "/calendar/v3/calendars/primary/events"
+        url = "/calendar/v3/calendars/primary/events?sendUpdates=all"
         headers = {'Content-type': 'application/json', 'Authorization': 'Bearer %s' % token}
         if not values.get('id'):
             values['id'] = uuid4().hex
@@ -76,13 +76,13 @@ class GoogleCalendarService():
 
     @requires_auth_token
     def patch(self, event_id, values, token=None, timeout=TIMEOUT):
-        url = "/calendar/v3/calendars/primary/events/%s" % event_id
+        url = "/calendar/v3/calendars/primary/events/%s?sendUpdates=all" % event_id
         headers = {'Content-type': 'application/json', 'Authorization': 'Bearer %s' % token}
         self.google_service._do_request(url, json.dumps(values), headers, method='PUT', timeout=timeout)
 
     @requires_auth_token
     def delete(self, event_id, token=None, timeout=TIMEOUT):
-        url = "/calendar/v3/calendars/primary/events/%s" % event_id
+        url = "/calendar/v3/calendars/primary/events/%s?sendUpdates=all" % event_id
         headers = {'Content-type': 'application/json'}
         params = {'access_token': token}
         try: