diff --git a/IntroToCloudComputing/CloudFunctionForPubsub/requirements.txt b/IntroToCloudComputing/CloudFunctionForPubsub/requirements.txt
index a18ab50..20b5c6f 100644
--- a/IntroToCloudComputing/CloudFunctionForPubsub/requirements.txt
+++ b/IntroToCloudComputing/CloudFunctionForPubsub/requirements.txt
@@ -8,7 +8,7 @@ googleapis-common-protos==1.6.0
 grpc-google-iam-v1==0.12.3
 grpcio==1.25.0
 idna==2.8
-protobuf==3.10.0
+protobuf==3.18.3
 pyasn1==0.4.7
 pyasn1-modules==0.2.7
 pytz==2019.3