It looks like there's mistake in the release of GitPython 3.1.28 with respect to the version.

Here's the output I'm getting when GitPython 3.1.28 is installed (usingpip3 install)

$ python3 -c 'import git; print(git.__version__)'git

With older GitPython versions, I'm getting a proper version instead:

$ python3 -c 'import git; print(git.__version__)'3.1.27