diff --git a/spec/spec_helper.cr b/spec/spec_helper.cr
index a14f1d3..78e58f0 100644
--- a/spec/spec_helper.cr
+++ b/spec/spec_helper.cr
@@ -307,11 +307,11 @@ module SpecHelper
   end
 
   def mock_list_events
-    WebMock.stub(:get, "https://graph.microsoft.com/v1.0/users/foo%40bar.com/calendar/calendarView?startDateTime=2020-01-01T00:00:00-00:00&endDateTime=2020-06-01T00:00:00-00:00&$top=10000").to_return(mock_event_query_json)
+    WebMock.stub(:get, "https://graph.microsoft.com/v1.0/users/foo%40bar.com/calendar/calendarView?startDateTime=2020-01-01T00%3A00%3A00-00%3A00&endDateTime=2020-06-01T00%3A00%3A00-00%3A00").to_return(mock_event_query_json)
   end
 
   def mock_list_events_error
-    WebMock.stub(:get, "https://graph.microsoft.com/v1.0/users/bar%40foo.com/calendar/calendarView?startDateTime=2020-01-01T00:00:00-00:00&endDateTime=2020-06-01T00:00:00-00:00&$top=10000")
+    WebMock.stub(:get, "https://graph.microsoft.com/v1.0/users/bar%40foo.com/calendar/calendarView?startDateTime=2020-01-01T00%3A00%3A00-00%3A00&endDateTime=2020-06-01T00%3A00%3A00-00%3A00")
       .to_return(mock_event_query_json_error)
   end