Support Python 3.14

[renaudjester]

✨ Feature Request

3.14 was released in October 2025

Motivation

That would allow libraries that depend on cf-units also to be installed on Python 3.14. (example: https://github.com/ioos/compliance-checker)

Is there any plan to release a new version with a new wheel?

[trexfeathers]

From @scitools/peloton:

Thanks @renaudjester, we agree this needs doing, and #627 looks like the way to do it (thanks @ocefpaf). We will aim to address this within a couple of weeks.