Add support for Python 3.14 (#9120)

Co-authored-by: Andrew Murray <3112309+radarhere@users.noreply.github.com>

Author: hugovk

docs/installation/newer-versions.csv

@@ -1,9 +1,10 @@
-Python,3.13,3.12,3.11,3.10,3.9,3.8,3.7,3.6,3.5
-Pillow >= 11,Yes,Yes,Yes,Yes,Yes,,,,
-Pillow 10.1 - 10.4,,Yes,Yes,Yes,Yes,Yes,,,
-Pillow 10.0,,,Yes,Yes,Yes,Yes,,,
-Pillow 9.3 - 9.5,,,Yes,Yes,Yes,Yes,Yes,,
-Pillow 9.0 - 9.2,,,,Yes,Yes,Yes,Yes,,
-Pillow 8.3.2 - 8.4,,,,Yes,Yes,Yes,Yes,Yes,
-Pillow 8.0 - 8.3.1,,,,,Yes,Yes,Yes,Yes,
-Pillow 7.0 - 7.2,,,,,,Yes,Yes,Yes,Yes
+Python,3.14,3.13,3.12,3.11,3.10,3.9,3.8,3.7,3.6,3.5
+Pillow 12,Yes,Yes,Yes,Yes,Yes,,,,,
+Pillow 11,,Yes,Yes,Yes,Yes,Yes,,,,
+Pillow 10.1 - 10.4,,,Yes,Yes,Yes,Yes,Yes,,,
+Pillow 10.0,,,,Yes,Yes,Yes,Yes,,,
+Pillow 9.3 - 9.5,,,,Yes,Yes,Yes,Yes,Yes,,
+Pillow 9.0 - 9.2,,,,,Yes,Yes,Yes,Yes,,
+Pillow 8.3.2 - 8.4,,,,,Yes,Yes,Yes,Yes,Yes,
+Pillow 8.0 - 8.3.1,,,,,,Yes,Yes,Yes,Yes,
+Pillow 7.0 - 7.2,,,,,,,Yes,Yes,Yes,Yes

docs/releasenotes/12.0.0.rst

@@ -136,7 +136,11 @@ TODO
 Other changes
 =============
 
-TODO
-^^^^
+Python 3.14
+^^^^^^^^^^^
 
-TODO
+Pillow 11.3.0 had wheels built against Python 3.14 beta, available as a preview to help
+others prepare for 3.14, and to ensure Pillow could be used immediately at the release
+of 3.14.0 final (2025-10-07, :pep:`745`).
+
+Pillow 12.0.0 now officially supports Python 3.14.

pyproject.toml

@@ -29,6 +29,7 @@ classifiers = [
   "Programming Language :: Python :: 3.11",
   "Programming Language :: Python :: 3.12",
   "Programming Language :: Python :: 3.13",
+  "Programming Language :: Python :: 3.14",
   "Programming Language :: Python :: Implementation :: CPython",
   "Programming Language :: Python :: Implementation :: PyPy",
   "Topic :: Multimedia :: Graphics",
@@ -206,7 +207,7 @@ lint.isort.required-imports = [
 ]
 
 [tool.pyproject-fmt]
-max_supported_python = "3.13"
+max_supported_python = "3.14"
 
 [tool.pytest.ini_options]
 addopts = "-ra --color=auto"