Find pyproject.toml file pyproject.toml is a modern standard configuration file for packaging metadata and tools configuration. It's typically in the project root directory of Python projects.

I think this has been a somewhat of a known issue for a while. Upstream protobuf maintainers have not committed to a stable Bazel interface for other projects to depend on as an external repository.

The newly approved Python Enhancement Proposal 751 gives Python a standard lock file format for specifying the dependencies of projects. Here’s the what, why, and when.