Require Python 3.5+ in setup.py and setup.cfg (#34) Followed these instructions: https://packaging.python.org/en/latest/guides/dropping-older-python-versions/ I'm not going to make a release with python_requires>='2.7' first as suggested by the docs, since dropping universal wheels should be enough to not have this version installed on Python 2, and since 3.4 and earlier are basically non-existent at this point.