diff --git a/.github/ISSUE_TEMPLATE/python-bump.md b/.github/ISSUE_TEMPLATE/python-bump.md
index 6daf89ea..8da37b22 100644
--- a/.github/ISSUE_TEMPLATE/python-bump.md
+++ b/.github/ISSUE_TEMPLATE/python-bump.md
@@ -3,7 +3,7 @@
 - Update Git main
   - [ ] `git checkout main`
   - [ ] In `pyproject.toml`, add classifier for new Python version and update `tool.black.target-version`
-  - [ ] Add new Python version to lists in `.github/workflows/python.yml`
+  - [ ] In `.github/workflows/python.yml`, update hardcoded Python versions and add new version to lists
   - [ ] Commit and open a PR
   - [ ] Merge the PR when CI passes
   - [ ] Add new Python jobs to [branch protection required checks](https://github.com/openslide/openslide-python/settings/branches)
diff --git a/pyproject.toml b/pyproject.toml
index 42ee741b..6bb05bb2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -23,6 +23,7 @@ classifiers = [
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
     "Topic :: Scientific/Engineering :: Bio-Informatics",
     "Typing :: Typed",
 ]
@@ -44,7 +45,7 @@ version = {attr = "openslide._version.__version__"}
 
 [tool.black]
 skip-string-normalization = true
-target-version = ["py38", "py39", "py310", "py311", "py312"]
+target-version = ["py38", "py39", "py310", "py311", "py312", "py313"]
 
 # https://black.readthedocs.io/en/stable/guides/using_black_with_other_tools.html#flake8
 # also ignore: