requirements.txt

# Requirements to build the Python documentation

# Sphinx version is pinned so that new versions that introduce new warnings
# won't suddenly cause build failures. Updating the version is fine as long
# as no warnings are raised by doing so.
sphinx==3.4.3
# Docutils version is pinned to a version compatible with Sphinx
# version <3.5.4. It can be removed after bumping Sphinx version to at
# least 3.5.4.
docutils==0.17.1
# Jinja version is pinned to a version compatible with Sphinx version <4.5.
jinja2==3.0.3
# Sphinx 3.4.3 uses imghdr which was removed from stdlib in Python 3.13
standard-imghdr==3.13.0; python_version>'3.12'

blurb

# The theme used by the documentation is stored separately, so we need
# to install that as well.
python-docs-theme==2025.2

-c constraints.txt