diff --git a/src/python/library/requirements/requirements_grpc.txt b/src/python/library/requirements/requirements_grpc.txt
index 59f823cec..ea9fb9bec 100644
--- a/src/python/library/requirements/requirements_grpc.txt
+++ b/src/python/library/requirements/requirements_grpc.txt
@@ -30,4 +30,5 @@
 grpcio>=1.41.0
 numpy>=1.19.1
 packaging>=14.1
+protobuf>=3.5.0,<5
 python-rapidjson>=0.9.1