chore: require Python 3.11+ (#244)

Python 3.10 reached end of life.

Assisted-by: ClaudeCode:claude-opus-5-5

Author: henryiii

.github/workflows/pip.yml

@@ -17,7 +17,7 @@ jobs:
       fail-fast: false
       matrix:
         platform: [windows-latest, macos-latest, ubuntu-latest]
-        python-version: ["3.9", "3.13"]
+        python-version: ["3.11", "3.13"]
 
     runs-on: ${{ matrix.platform }}
 

README.md

@@ -17,7 +17,7 @@ python_example
 [actions-wheels-badge]:    https://github.com/pybind/python_example/workflows/Wheels/badge.svg
 
 An example project built with [pybind11](https://github.com/pybind/pybind11).
-This requires Python 3.9+; for older versions of Python, check the commit
+This requires Python 3.11+; for older versions of Python, check the commit
 history.
 
 Installation

pyproject.toml

@@ -14,7 +14,7 @@ build-frontend = "build[uv]"
 
 [tool.ruff]
 show-fixes = true
-target-version = "py39"
+target-version = "py311"
 
 [tool.ruff.lint]
 extend-select = [

setup.py

@@ -36,5 +36,5 @@
     # level" feature, but in the future it may provide more features.
     cmdclass={"build_ext": build_ext},
     zip_safe=False,
-    python_requires=">=3.9",
+    python_requires=">=3.11",
 )