diff --git a/Bot/sample_bot/calendarEvents/requirements.txt b/Bot/sample_bot/calendarEvents/requirements.txt
index 68414c3..fb4c462 100644
--- a/Bot/sample_bot/calendarEvents/requirements.txt
+++ b/Bot/sample_bot/calendarEvents/requirements.txt
@@ -10,7 +10,7 @@ googleapis-common-protos==1.51.0
 httplib2==0.17.1
 idna==2.9
 oauthlib==3.1.0
-protobuf==3.11.3
+protobuf==3.15.0
 pyasn1==0.4.8
 pyasn1-modules==0.2.8
 pytz==2019.3