Drop Python 3.9 support

.github/workflows/main.yml

@@ -16,9 +16,6 @@ jobs:
       matrix:
         os: [ubuntu, macos, windows]
         python: ["3.10", "3.11", "3.12", "3.13"]
-        include:
-          - os: ubuntu
-            python: "3.9"
 
     steps:
       - uses: actions/checkout@v5

pyproject.toml

@@ -14,7 +14,6 @@ classifiers = [
     "License :: OSI Approved :: GNU Affero General Public License v3 or later (AGPLv3+)",
     "Operating System :: OS Independent",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
@@ -27,7 +26,7 @@ classifiers = [
     "Topic :: Text Processing :: Markup :: HTML",
     "Topic :: Text Processing :: Markup :: reStructuredText",
 ]
-requires-python = ">=3.9,<4.0"
+requires-python = ">=3.10,<4.0"
 dependencies = [
     "blinker>=1.7.0",
     "docutils>=0.20.1",

tox.ini

@@ -1,9 +1,8 @@
 [tox]
-envlist = py{3.9,3.10,3.11,3.12,3.13},docs
+envlist = py{3.10,3.11,3.12,3.13},docs
 
 [testenv]
 basepython =
-    py3.9: python3.9
     py3.10: python3.10
     py3.11: python3.11
     py3.12: python3.12