update python version

.github/workflows/ci.yaml

@@ -24,8 +24,11 @@ jobs:
       - uses: actions/checkout@v4
       - name: Pull pybind11
         run: git submodule update --init --recursive
-      - name: Setup Python
+      - name: Setup Python 3.9
         uses: actions/setup-python@v5
+        with:
+          python-version: '3.9'
+          cache: 'pip'
       - name: Install build tools
         run: pip install wheel setuptools cibuildwheel==2.21.3
       - name: Build wheels

pyproject.toml

@@ -9,7 +9,7 @@ build-backend = "setuptools.build_meta"
 
 [tool.mypy]
 files = "setup.py"
-python_version = "3.7"
+python_version = "3.9"
 strict = true
 show_error_codes = true
 enable_error_code = ["ignore-without-code", "redundant-expr", "truthy-bool"]
@@ -38,7 +38,7 @@ test-skip = ["*universal2:arm64"]
 before-build = "rm -rf {project}/build"
 
 [tool.ruff]
-target-version = "py37"
+target-version = "py39"
 
 [tool.ruff.lint]
 extend-select = [

setup.py

@@ -139,5 +139,5 @@ def build_extension(self, ext: CMakeExtension) -> None:
     cmdclass={"build_ext": CMakeBuild},
     zip_safe=False,
     extras_require={"test": ["pytest>=6.0"]},
-    python_requires=">=3.7",
+    python_requires=">=3.9",
 )