As seen with https://pypi.org/project/python-gitlab/4.5.0/ [1] the filename found on https://files.pythonhosted.org/packages/source filenames that contain a hyphenated project name replacing will now be a normalized replacing the - with _ making the URL before: https://files.pythonhosted.org/packages/source/p/python-gitlab/python-gitlab-4.5.0.tar.gz to https://files.pythonhosted.org/packages/source/p/python-gitlab/python_gitlab-4.5.0.tar.gz The sdist filename [2] is being normalized to support pip625 [3]. It appearas that maybe some tools/utilities are following this. Should ports support both x-y-ver.tar.gz and x_y-var.tar.gz? [1] https://github.com/python-gitlab/python-gitlab/actions/runs/9070561059/job/24922596892#step:6:798 [2] https://github.com/pypa/setuptools/issues/3593 [3] https://peps.python.org/pep-0625/