diff --git a/v2functions/requirements.txt b/v2functions/requirements.txt
index 9bc5803..4ba6c98 100644
--- a/v2functions/requirements.txt
+++ b/v2functions/requirements.txt
@@ -3,7 +3,7 @@ azure-functions
 azure-functions-worker
 grpcio~=1.20.1
 grpcio-tools~=1.20.1
-protobuf==3.6.1
+protobuf==3.18.3
 six==1.11.0
 # Additional packages
 requests==2.20.1