Hi Julien,

I think that there are two items to consider:
- `needs_sphinx` in `conf.py`
- setting for Sphinx in `cpython/Doc/requirements.txt`

I believe that the `needs_sphinx` field identifies the minimal version of Sphinx that can be used to build the docs. The actual version that is used to build the docs is in the `requirements.txt` file.

On Wed, Jan 13, 2021 at 7:29 AM Serhiy Storchaka <storchaka@gmail.com> wrote:
12.01.21 22:38, Julien Palard via Python-Dev пише:
> During the development of cpython 3.10, Sphinx was bumped to 3.2.1.
> Problem is Sphinx 3 have some incompatibilities with Sphinx 2, some that
> we could work around, some are bit harder, so we may need to bump
> `needs_sphinx = '3.2'` (currently it is 1.8).

Sphinx version in the current Ubuntu LTS (20.04) is 1.8.5. Would not it
cause problems with builting documentation on Ubuntu?
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