diff --git a/requirements-dev.txt b/requirements-dev.txt
index 56ab376..cbd2882 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -16,4 +16,9 @@ pytest-asyncio>=0.21.0   # Async test support (already in main requirements)
 
 # Development Tools
 ipython>=8.12.0          # Enhanced Python shell
-ipdb>=0.13.13            # IPython debugger
\ No newline at end of file
+ipdb>=0.13.13            # IPython debugger
+
+# gRPC code generation (regenerate ingestor/proto/*_pb2*.py) — not needed
+# at runtime: the generated stubs are committed. Kept out of requirements.txt
+# because workers install only from the cluster package index.
+grpcio-tools>=1.60
diff --git a/requirements.txt b/requirements.txt
index 36ddd06..b6d8b89 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,4 +8,6 @@ prometheus_client
 pymongo
 nats-py>=2.6
 grpcio>=1.60
-grpcio-tools>=1.60
\ No newline at end of file
+# Runtime of the committed gRPC stubs: ingestor/proto/opc_gateway_pb2.py was
+# generated with protobuf 7.35.0 and validates the runtime version on import.
+protobuf>=7.35