Add support for Python 3.15 (#9776)

Author: hugovk

docs/installation/newer-versions.csv

@@ -1,10 +1,11 @@
-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
+Python,3.15,3.14,3.13,3.12,3.11,3.10,3.9,3.8,3.7,3.6,3.5
+Pillow 13,Yes,Yes,Yes,Yes,Yes,,,,,,
+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/13.0.0.rst

@@ -87,7 +87,11 @@ TODO
 Other changes
 =============
 
-TODO
-^^^^
+Python 3.15
+^^^^^^^^^^^
 
-TODO
+Pillow 12.3.0 had wheels built against Python 3.15 beta, available as a preview
+to help projects prepare for 3.15, and to ensure Pillow could be used
+immediately at the release of 3.15.0 final (2026-10-01, :pep:`790`).
+
+Pillow 13.0.0 now officially supports Python 3.15.

pyproject.toml

@@ -29,6 +29,7 @@ classifiers = [
   "Programming Language :: Python :: 3.12",
   "Programming Language :: Python :: 3.13",
   "Programming Language :: Python :: 3.14",
+  "Programming Language :: Python :: 3.15",
   "Programming Language :: Python :: Implementation :: CPython",
   "Programming Language :: Python :: Implementation :: PyPy",
   "Topic :: Multimedia :: Graphics",
@@ -185,7 +186,7 @@ lint.isort.required-imports = [
 ]
 
 [tool.pyproject-fmt]
-max_supported_python = "3.14"
+max_supported_python = "3.15"
 
 [tool.mypy]
 follow_imports = "silent"