What version of gRPC and what language are you using?

Python

Package versions:

• grpcio 1.66.1
• grpcio-tools 1.66.1

What operating system (Linux, Windows,...) and version?

Windows 11 Version 23H2 (OS Build 22631.4037)

What runtime / compiler are you using (e.g. python version or version of gcc)

Python 3.12.4 (tags/v3.12.4:8e8a4ba, Jun 6 2024, 19:30:16) [MSC v.1940 64 bit (AMD64)] on win32

What did you do?

• Create clean virtual environment with Python 3.12
• Run pip install grpcio grpcio-tools (as of today, this will install version 1.66.1)
• Create file test.proto that only contains syntax = "proto3";
• Run python -m grpc_tools.protoc --python_out=. --pyi_out=. --grpc_python_out=. -I. test.proto

What did you expect to see?

I can import the generated Python files without issues and warnings.

What did you see instead?

>>> import test_pb2
C:\temp\grpc-test\venv\Lib\site-packages\google\protobuf\runtime_version.py:112: UserWarning: Protobuf gencode version 5.27.2 is older than the runtime version 5.28.0 at test.proto. Please avoid checked-in Protobuf gencode that can be obsolete.
  warnings.warn(
>>>

Anything else we should know about your project / environment?

Caused by this pull request: protocolbuffers/protobuf#17241 that is present since protobuf 5.28.0

gprc protoc uses protobuf 5.27.2 for generation, but pip automatically pulls in the newest version (5.28.0), generating this warning.