`check_outdated()` errors with Setuptools >= v82.0.0

[hakonanes]

Hi there,

And thanks for this package! We've used it for many years in the CD of https://github.com/pyxem/orix and related repos.

outdated v0.2.2 errors with the recently released Setuptools v82.0.0. The reason is that pkg_resources, used in the check_outdated function, is no longer packaged with Setuptools:

outdated/outdated/__init__.py

Line 36 in 26c8c28

from pkg_resources import parse_version

To reproduce

Setup in a fresh conda environment

$ pip install -U outdated
...
$ pip list
Package            Version
------------------ --------
certifi            2026.1.4
charset-normalizer 3.4.4
idna               3.11
littleutils        0.2.4
outdated           0.2.2
packaging          26.0
pip                26.0.1
requests           2.32.5
setuptools         82.0.0
urllib3            2.6.3

Test check_outdated():

$ python
Python 3.13.12 | packaged by conda-forge | (main, Feb  5 2026, 06:11:05) [Clang 19.1.7 ] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from outdated import check_outdated
/opt/homebrew/Caskroom/miniforge/base/envs/outdated-test/lib/python3.13/site-packages/outdated/utils.py:14: OutdatedCheckFailedWarning: Failed to check for latest version of package.
                                                                                                                                                                                      Set the environment variable OU
                                                                                                                                                                                                                    S
                                                                                                                                                                                                                     
                                                                                                                                                                                                                    >
KeyboardInterrupt
>>> from outdated import check_outdated
>>> check_outdated("orix", "0.14.2")
Traceback (most recent call last):
  File "<python-input-2>", line 1, in <module>
    check_outdated("orix", "0.14.2")
    ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
  File "/opt/homebrew/Caskroom/miniforge/base/envs/outdated-test/lib/python3.13/site-packages/outdated/__init__.py", line 36, in check_outdated
    from pkg_resources import parse_version
ModuleNotFoundError: No module named 'pkg_resources'

If I install pip install "setuptools<82", check_outdated() works.

Solution?

According to pypa/setuptools#3085, replacing pkg_resources with importlib.metadata and importlib.resources is the way forward.