[MM3-users] Re: FutureWarning: Use `header_id_prefix` instead

July 28, 2026


      Am Tuesday, 28 July 2026, 10:40:51 Central European Summer Time schrieb
Andreas Vetter:
...
Hi,
after a recent update of the prerequisites using:
pip install -U --upgrade-strategy eager mailman postorius django-mailman3
hyperkitty mailman-web
I get warnings from the cronjobs:
/opt/mailman/venv/lib64/python3.11/site-packages/readme_renderer/
markdown.py:44: FutureWarning: Use header_id_prefix instead
gfm_extension_options.header_ids = _HEADER_ID_PREFIX
What would be the best way to silence the warnings? Google does not find the
warning message yet.
Cheers,
Andreas
Quick fix is to change line 44 in /opt/mailman/venv/lib64/python3.11/site-
packages/readme_renderer/markdown.py from
gfm_extension_options.header_ids = _HEADER_ID_PREFIX
to
gfm_extension_options.header_id_prefix = _HEADER_ID_PREFIX
Greetings,
Andreas