The last release of PyXB was 1.2.6 dated 2017-09-03, with some patches toward an optimistic PyXB 1.2.7 last made 2018-02-11. No maintenance has occured since then, and none is anticipated.
Per #100 (comment) the last version of Python that PyXB works with at all reaches end-of-life soon.
PyXB-X is a fork that may be useful for people who have a dependence on PyXB and need further Python releases.
2023-04-29