diff --git a/Makefile b/Makefile
index 3c1ed51..5c13901 100644
--- a/Makefile
+++ b/Makefile
@@ -13,6 +13,7 @@ install:
 gen-proto:
 	curl -o durabletask/internal/orchestrator_service.proto https://raw.githubusercontent.com/dapr/durabletask-protobuf/refs/heads/main/protos/orchestrator_service.proto
 	curl -H "Accept: application/vnd.github.v3+json" "https://api.github.com/repos/dapr/durabletask-protobuf/commits?path=protos/orchestrator_service.proto&sha=main&per_page=1" | jq -r '.[0].sha' > durabletask/internal/PROTO_SOURCE_COMMIT_HASH
+	# NOTE: remember to check/update pyproject.toml protobuf version to follow https://github.com/grpc/grpc/blob/v{{VERSION GRPC IO TOOL BELLOW}}/tools/distrib/python/grpcio_tools/setup.py
 	pip install grpcio-tools==1.74.0
 	python3 -m grpc_tools.protoc --proto_path=.  --python_out=. --pyi_out=. --grpc_python_out=. ./durabletask/internal/orchestrator_service.proto
 	rm durabletask/internal/*.proto
diff --git a/pyproject.toml b/pyproject.toml
index 8c4d1e4..9bcf1bb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -26,7 +26,7 @@ license = {file = "LICENSE"}
 readme = "README.md"
 dependencies = [
     "grpcio",
-    "protobuf",
+    "protobuf>=6.31.1,<7.0.0", # follows grpcio generation version https://github.com/grpc/grpc/blob/v1.74.0/tools/distrib/python/grpcio_tools/setup.py
     "asyncio"
 ]