diff --git a/.appveyor.yml b/.appveyor.yml
index 060b78f3..449bd24d 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -1,27 +1,13 @@
 version: '{build}'
-image: Visual Studio 2015
-platform:
-- x86
-- x64
-environment:
-  global:
-    DISTUTILS_USE_SDK: 1
-    PYTHONWARNINGS: ignore:DEPRECATION
-    MSSdk: 1
-  matrix:
-  - PYTHON: 27
-  - PYTHON: 36
+image: Visual Studio 2019
+stack: python 3.12
+skip_branch_with_pr: true
+init:
+- cmd: set PATH=C:\Python312;C:\Python312\Scripts;%PATH%
 install:
-- cmd: '"%VS140COMNTOOLS%\..\..\VC\vcvarsall.bat" %PLATFORM%'
-- ps: |
-    if ($env:PLATFORM -eq "x64") { $env:PYTHON = "$env:PYTHON-x64" }
-    $env:PATH = "C:\Python$env:PYTHON\;C:\Python$env:PYTHON\Scripts\;$env:PATH"
-    python -m pip install --disable-pip-version-check --upgrade --no-warn-script-location pip build virtualenv
+- ps: python -m pip install --disable-pip-version-check --upgrade --no-warn-script-location pip build virtualenv wheel
 build_script:
 - ps: |
-    python -m build -s
-    cd dist
-    python -m pip install --verbose python_example-0.0.1.tar.gz
-    cd ..
+    python -m pip install .
 test_script:
 - ps: python tests\test.py
diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index 73273365..6c4b3695 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -4,13 +4,8 @@ updates:
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule:
-      interval: "daily"
-    ignore:
-      # Official actions have moving tags like v1
-      # that are used, so they don't need updates here
-      - dependency-name: "actions/checkout"
-      - dependency-name: "actions/setup-python"
-      - dependency-name: "actions/cache"
-      - dependency-name: "actions/upload-artifact"
-      - dependency-name: "actions/download-artifact"
-      - dependency-name: "actions/labeler"
+      interval: "weekly"
+    groups:
+      actions:
+        patterns:
+          - "*"
diff --git a/.github/workflows/conda.yml b/.github/workflows/conda.yml
deleted file mode 100644
index 248aa3e4..00000000
--- a/.github/workflows/conda.yml
+++ /dev/null
@@ -1,44 +0,0 @@
-name: Conda
-
-on:
-  workflow_dispatch:
-  push:
-    branches:
-      - master
-  pull_request:
-
-jobs:
-  build:
-    strategy:
-      fail-fast: false
-      matrix:
-        platform: [ubuntu-latest, windows-latest, macos-latest]
-        python-version: ["3.6", "3.8"]
-
-    runs-on: ${{ matrix.platform }}
-
-    # The setup-miniconda action needs this to activate miniconda
-    defaults:
-      run:
-        shell: "bash -l {0}"
-
-    steps:
-      - uses: actions/checkout@v2
-
-      - name: Get conda
-        uses: conda-incubator/setup-miniconda@v2.1.1
-        with:
-          python-version: ${{ matrix.python-version }}
-          channels: conda-forge
-          
-      - name: Prepare
-        run: conda install conda-build conda-verify
-
-      - name: Build
-        run: conda build conda.recipe
-
-      - name: Install
-        run: conda install -c ${CONDA_PREFIX}/conda-bld/ python_example
-
-      - name: Test
-        run: python tests/test.py
diff --git a/.github/workflows/pip.yml b/.github/workflows/pip.yml
index e5f5d27f..e6aae511 100644
--- a/.github/workflows/pip.yml
+++ b/.github/workflows/pip.yml
@@ -7,44 +7,64 @@ on:
     branches:
       - master
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   build:
     strategy:
       fail-fast: false
       matrix:
         platform: [windows-latest, macos-latest, ubuntu-latest]
-        python-version: ["2.7", "3.5", "3.8", "3.9"]
+        python-version: ["3.9", "3.13"]
 
     runs-on: ${{ matrix.platform }}
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v6
 
-    - uses: actions/setup-python@v2
+    - uses: actions/setup-python@v6
       with:
         python-version: ${{ matrix.python-version }}
 
     - name: Add requirements
       run: python -m pip install --upgrade wheel setuptools
 
-    # Eventually Microsoft might have an action for setting up
-    # MSVC, but for now, this action works:
-    - name: Prepare compiler environment for Windows 🐍 2.7
-      if: matrix.python-version == 2.7 && runner.os == 'Windows'
-      uses: ilammy/msvc-dev-cmd@v1
+    - name: Build and install
+      run: pip install --verbose .
+
+    - name: Test
+      run: python tests/test.py
+
+  build-mingw64:
+    runs-on: windows-latest
+    defaults:
+      run:
+        shell: msys2 {0}
+    steps:
+    - uses: msys2/setup-msys2@v2
       with:
-        arch: x64
+        update: true
+        install: >-
+          mingw-w64-x86_64-gcc
+          mingw-w64-x86_64-python-pip
+          mingw-w64-x86_64-python-wheel
 
-    # This makes two environment variables available in the following step(s)
-    - name: Set Windows 🐍 2.7 environment variables
-      if: matrix.python-version == 2.7 && runner.os == 'Windows'
-      shell: bash
-      run: |
-        echo "DISTUTILS_USE_SDK=1" >> $GITHUB_ENV
-        echo "MSSdk=1" >> $GITHUB_ENV
+    - uses: actions/checkout@v6
+
+    - name: Install pybind11
+      # This is required because --no-build-isolation disable dependences
+      # installation
+      run: pip install pybind11
 
     - name: Build and install
-      run: pip install --verbose .
+      # --no-build-isolation is required because the vanilla setuptool does not
+      # support Mingw64.See patches here:
+      # https://github.com/msys2/MINGW-packages/tree/master/mingw-w64-python-setuptools
+      # Without those patches build_ext fails with:
+      # error: --plat-name must be one of ('win32', 'win-amd64', 'win-arm32', 'win-arm64')
+      run: pip install --no-build-isolation .
 
     - name: Test
       run: python tests/test.py
diff --git a/.github/workflows/wheels.yml b/.github/workflows/wheels.yml
index 57b37401..3be94729 100644
--- a/.github/workflows/wheels.yml
+++ b/.github/workflows/wheels.yml
@@ -10,18 +10,16 @@ on:
     types:
       - published
 
-env:
-  CIBW_TEST_COMMAND: python {project}/tests/test.py
-  CIBW_ARCHS_MACOS: auto universal2
-  CIBW_TEST_SKIP: "*universal2:arm64"
-
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
 
 jobs:
   build_sdist:
     name: Build SDist
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v6
 
     - name: Build SDist
       run: pipx run build --sdist
@@ -29,8 +27,9 @@ jobs:
     - name: Check metadata
       run: pipx run twine check dist/*
 
-    - uses: actions/upload-artifact@v2
+    - uses: actions/upload-artifact@v5
       with:
+        name: cibw-sdist
         path: dist/*.tar.gz
 
 
@@ -40,81 +39,43 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, windows-latest, macos-latest]
+        os: [ubuntu-latest, windows-latest, macos-latest, macos-15-intel]
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v6
 
-    - uses: pypa/cibuildwheel@v1.12.0
+    - uses: pypa/cibuildwheel@v3.3
       env:
-        # Python 2.7 on Windows requires a workaround for C++11 support,
-        # built separately below
-        CIBW_SKIP: cp27-win*
+        CIBW_ARCHS_MACOS: auto universal2
 
     - name: Verify clean directory
       run: git diff --exit-code
       shell: bash
 
     - name: Upload wheels
-      uses: actions/upload-artifact@v2
-      with:
-        path: wheelhouse/*.whl
-
-
-  # Windows 2.7 (requires workaround for MSVC 2008 replacement)
-  build_win27_wheels:
-    name: Py 2.7 wheels on Windows
-    runs-on: windows-latest
-
-    steps:
-    - uses: actions/checkout@v2
-      with:
-        submodules: true
-
-    - uses: ilammy/msvc-dev-cmd@v1
-
-    - name: Build 64-bit wheel
-      uses: pypa/cibuildwheel@v1.12.0
-      env:
-        CIBW_BUILD: cp27-win_amd64
-        DISTUTILS_USE_SDK: 1
-        MSSdk: 1
-
-    - uses: ilammy/msvc-dev-cmd@v1
-      with:
-        arch: x86
-
-    - name: Build 32-bit wheel
-      uses: pypa/cibuildwheel@v1.12.0
-      env:
-        CIBW_BUILD: cp27-win32
-        DISTUTILS_USE_SDK: 1
-        MSSdk: 1
-
-    - name: Verify clean directory
-      run: git diff --exit-code
-      shell: bash
-
-    - uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v5
       with:
+        name: cibw-wheels-${{ matrix.os }}
         path: wheelhouse/*.whl
 
 
   upload_all:
     name: Upload if release
-    needs: [build_wheels, build_win27_wheels, build_sdist]
+    needs: [build_wheels, build_sdist]
     runs-on: ubuntu-latest
     if: github.event_name == 'release' && github.event.action == 'published'
 
     steps:
-    - uses: actions/setup-python@v2
+    - uses: actions/setup-python@v6
+      with:
+        python-version: "3.x"
 
-    - uses: actions/download-artifact@v2
+    - uses: actions/download-artifact@v6
       with:
-        name: artifact
+        pattern: cibw-*
         path: dist
-
-    - uses: pypa/gh-action-pypi-publish@v1.4.2
+        merge-multiple: true
+    - uses: pypa/gh-action-pypi-publish@release/v1
       with:
         user: __token__
         password: ${{ secrets.pypi_password }}
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
new file mode 100644
index 00000000..a9de863e
--- /dev/null
+++ b/.pre-commit-config.yaml
@@ -0,0 +1,54 @@
+# To use:
+#
+#     pre-commit run -a
+#
+# Or:
+#
+#     pre-commit install  # (runs every time you commit in git)
+#
+# To update this file:
+#
+#     pre-commit autoupdate
+#
+# See https://github.com/pre-commit/pre-commit
+
+ci:
+  autoupdate_commit_msg: "chore: update pre-commit hooks"
+  autofix_commit_msg: "style: pre-commit fixes"
+
+repos:
+# Standard hooks
+- repo: https://github.com/pre-commit/pre-commit-hooks
+  rev: v6.0.0
+  hooks:
+  - id: check-added-large-files
+  - id: check-case-conflict
+  - id: check-merge-conflict
+  - id: check-symlinks
+  - id: check-yaml
+    exclude: ^conda\.recipe/meta\.yaml$
+  - id: debug-statements
+  - id: end-of-file-fixer
+  - id: mixed-line-ending
+  - id: requirements-txt-fixer
+  - id: trailing-whitespace
+
+# Lints code
+- repo: https://github.com/astral-sh/ruff-pre-commit
+  rev: "v0.14.8"
+  hooks:
+  - id: ruff
+    args: ["--fix", "--show-fixes"]
+  - id: ruff-format
+
+# Changes tabs to spaces
+- repo: https://github.com/Lucas-C/pre-commit-hooks
+  rev: v1.5.5
+  hooks:
+  - id: remove-tabs
+
+# Suggested hook if you add a .clang-format file
+# - repo: https://github.com/pre-commit/mirrors-clang-format
+#  rev: v13.0.0
+#  hooks:
+#  - id: clang-format
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 4cda4773..00000000
--- a/.travis.yml
+++ /dev/null
@@ -1,36 +0,0 @@
-language: cpp
-dist: trusty
-matrix:
-  include:
-  - os: linux
-    env: PYTHON=3.8
-  - os: linux
-    env: CONDA=3.7
-before_install:
-- |
-  export CXX=g++-4.8 CC=gcc-4.8
-  if [ -n "$PYTHON" ]; then
-    python -m pip install --user virtualenv
-    virtualenv -p python${PYTHON:0:1} venv
-    source venv/bin/activate
-  elif [ -n "$CONDA" ]; then
-    wget -O miniconda.sh https://repo.continuum.io/miniconda/Miniconda${CONDA:0:1}-latest-Linux-x86_64.sh
-    bash miniconda.sh -b -p $HOME/miniconda
-    export PATH="$HOME/miniconda/bin:$PATH"
-    conda config --set always_yes yes --set changeps1 no
-    conda config --add channels conda-forge
-    conda update -q conda
-    conda install -q conda-build
-    conda create -q -n test-environment python=$CONDA
-    source activate test-environment
-  fi
-install:
-- |
-  if [ -n "$PYTHON" ]; then
-    python -m pip install .
-  elif [ -n "$CONDA" ]; then
-    conda build conda.recipe --python $CONDA
-    conda install --use-local python_example
-  fi
-script:
-- python tests/test.py
diff --git a/README.md b/README.md
index 2bdeb670..92522d60 100644
--- a/README.md
+++ b/README.md
@@ -5,58 +5,27 @@ python_example
 
 |      CI              | status |
 |----------------------|--------|
-| Linux/macOS Travis   | [![Travis-CI][travis-badge]][travis-link] |
-| MSVC 2015            | [![AppVeyor][appveyor-badge]][appveyor-link] |
-| conda.recipe         | [![Conda Actions Status][actions-conda-badge]][actions-conda-link] |
 | pip builds           | [![Pip Actions Status][actions-pip-badge]][actions-pip-link] |
 | [`cibuildwheel`][]   | [![Wheels Actions Status][actions-wheels-badge]][actions-wheels-link] |
 
 [gitter-badge]:            https://badges.gitter.im/pybind/Lobby.svg
 [gitter-link]:             https://gitter.im/pybind/Lobby
 [actions-badge]:           https://github.com/pybind/python_example/workflows/Tests/badge.svg
-[actions-conda-link]:      https://github.com/pybind/python_example/actions?query=workflow%3A%22Conda
-[actions-conda-badge]:     https://github.com/pybind/python_example/workflows/Conda/badge.svg
 [actions-pip-link]:        https://github.com/pybind/python_example/actions?query=workflow%3A%22Pip
 [actions-pip-badge]:       https://github.com/pybind/python_example/workflows/Pip/badge.svg
 [actions-wheels-link]:     https://github.com/pybind/python_example/actions?query=workflow%3AWheels
 [actions-wheels-badge]:    https://github.com/pybind/python_example/workflows/Wheels/badge.svg
-[travis-link]:             https://travis-ci.org/pybind/python_example
-[travis-badge]:            https://travis-ci.org/pybind/python_example.svg?branch=master&status=passed 
-[appveyor-link]:           https://ci.appveyor.com/project/wjakob/python-example
-<!-- TODO: get a real badge link for appveyor -->
-[appveyor-badge]:          https://travis-ci.org/pybind/python_example.svg?branch=master&status=passed
 
 An example project built with [pybind11](https://github.com/pybind/pybind11).
+This requires Python 3.7+; for older versions of Python, check the commit
+history.
 
 Installation
 ------------
 
-**On Unix (Linux, OS X)**
-
  - clone this repository
  - `pip install ./python_example`
 
-**On Windows (Requires Visual Studio 2015)**
-
- - For Python 3.5+:
-     - clone this repository
-     - `pip install ./python_example`
- - For Python 2.7:
-
-   Pybind11 requires a C++11 compliant compiler (i.e. Visual Studio 2015 on
-   Windows). Running a regular `pip install` command will detect the version
-   of the compiler used to build Python and attempt to build the extension
-   with it. We must force the use of Visual Studio 2015.
-
-     - clone this repository
-     - `"%VS140COMNTOOLS%\..\..\VC\vcvarsall.bat" x64`
-     - `set DISTUTILS_USE_SDK=1`
-     - `set MSSdk=1`
-     - `pip install ./python_example`
-
-   Note that this requires the user building `python_example` to have registry edition
-   rights on the machine, to be able to run the `vcvarsall.bat` script.
-
 CI Examples
 -----------
 
@@ -65,14 +34,6 @@ binary "wheels" for all platforms is illustrated in the "wheels.yml" file,
 using [`cibuildwheel`][]. You can also see a basic recipe for building and
 testing in `pip.yml`, and `conda.yml` has an example of a conda recipe build.
 
-Windows Python 2.7 runtime requirements
-----------------------------
-
-On Windows, the Visual C++ 2015 redistributable packages are a runtime
-requirement for this project if you build for Python 2.7 (newer versions of
-Python include this redistributable). It can be found
-[here](https://www.microsoft.com/en-us/download/details.aspx?id=48145).
-
 
 Building the documentation
 --------------------------
diff --git a/conda.recipe/meta.yaml b/conda.recipe/meta.yaml
deleted file mode 100644
index 964116b5..00000000
--- a/conda.recipe/meta.yaml
+++ /dev/null
@@ -1,35 +0,0 @@
-package:
-  name: python_example
-  version: 0.0.1
-
-source:
-  path: ..
-
-build:
-  number: 0
-  script: python -m pip install . -vvv
-
-requirements:
-  build:
-    - {{ compiler('cxx') }}
-
-  host:
-    - python
-    - pip
-    - pybind11 >=2.6.0
-
-  run:
-    - python
-
-
-test:
-  imports:
-    - python_example
-  source_files:
-    - tests
-  commands:
-    - python tests/test.py
-
-about:
-  summary: An example project built with pybind11.
-  license_file: LICENSE
diff --git a/docs/.gitignore b/docs/.gitignore
new file mode 100644
index 00000000..0f5c0798
--- /dev/null
+++ b/docs/.gitignore
@@ -0,0 +1 @@
+_generate/*
diff --git a/docs/conf.py b/docs/conf.py
index a21ab506..a3921a47 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 #
 # python_example documentation build configuration file, created by
 # sphinx-quickstart on Fri Feb 26 00:29:33 2016.
@@ -12,99 +11,97 @@
 # All configuration values have a default; values that are commented out
 # serve to show the default.
 
-import sys
-import os
 
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.
-#sys.path.insert(0, os.path.abspath('.'))
+# sys.path.insert(0, os.path.abspath('.'))
 
 # -- General configuration ------------------------------------------------
 
 # If your documentation needs a minimal Sphinx version, state it here.
-#needs_sphinx = '1.0'
+# needs_sphinx = '1.0'
 
 # Add any Sphinx extension module names here, as strings. They can be
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
 # ones.
 extensions = [
-    'sphinx.ext.autodoc',
-    'sphinx.ext.intersphinx',
-    'sphinx.ext.autosummary',
-    'sphinx.ext.napoleon',
+    "sphinx.ext.autodoc",
+    "sphinx.ext.intersphinx",
+    "sphinx.ext.autosummary",
+    "sphinx.ext.napoleon",
 ]
 
 autosummary_generate = True
 
 # Add any paths that contain templates here, relative to this directory.
-templates_path = ['_templates']
+templates_path = ["_templates"]
 
 # The suffix(es) of source filenames.
 # You can specify multiple suffix as a list of string:
 # source_suffix = ['.rst', '.md']
-source_suffix = '.rst'
+source_suffix = {".rst": "restructuredtext"}
 
 # The encoding of source files.
-#source_encoding = 'utf-8-sig'
+# source_encoding = 'utf-8-sig'
 
 # The master toctree document.
-master_doc = 'index'
+master_doc = "index"
 
 # General information about the project.
-project = u'python_example'
-copyright = u'2016, Sylvain Corlay'
-author = u'Sylvain Corlay'
+project = "python_example"
+copyright = "2016, Sylvain Corlay"
+author = "Sylvain Corlay"
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the
 # built documents.
 #
 # The short X.Y version.
-version = u'0.0.1'
+version = "0.0.1"
 # The full version, including alpha/beta/rc tags.
-release = u'0.0.1'
+release = "0.0.1"
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
 #
 # This is also used if you do content translation via gettext catalogs.
 # Usually you set "language" from the command line for these cases.
-language = None
+language = "en"
 
 # There are two options for replacing |today|: either, you set today to some
 # non-false value, then it is used:
-#today = ''
+# today = ''
 # Else, today_fmt is used as the format for a strftime call.
-#today_fmt = '%B %d, %Y'
+# today_fmt = '%B %d, %Y'
 
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.
-exclude_patterns = ['_build']
+exclude_patterns = ["_build"]
 
 # The reST default role (used for this markup: `text`) to use for all
 # documents.
-#default_role = None
+# default_role = None
 
 # If true, '()' will be appended to :func: etc. cross-reference text.
-#add_function_parentheses = True
+# add_function_parentheses = True
 
 # If true, the current module name will be prepended to all description
 # unit titles (such as .. function::).
-#add_module_names = True
+# add_module_names = True
 
 # If true, sectionauthor and moduleauthor directives will be shown in the
 # output. They are ignored by default.
-#show_authors = False
+# show_authors = False
 
 # The name of the Pygments (syntax highlighting) style to use.
-pygments_style = 'sphinx'
+pygments_style = "sphinx"
 
 # A list of ignored prefixes for module index sorting.
-#modindex_common_prefix = []
+# modindex_common_prefix = []
 
 # If true, keep warnings as "system message" paragraphs in the built documents.
-#keep_warnings = False
+# keep_warnings = False
 
 # If true, `todo` and `todoList` produce output, else they produce nothing.
 todo_include_todos = False
@@ -114,143 +111,145 @@
 
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
-html_theme = 'alabaster'
+html_theme = "alabaster"
 
 # Theme options are theme-specific and customize the look and feel of a theme
 # further.  For a list of options available for each theme, see the
 # documentation.
-#html_theme_options = {}
+# html_theme_options = {}
 
 # Add any paths that contain custom themes here, relative to this directory.
-#html_theme_path = []
+# html_theme_path = []
 
 # The name for this set of Sphinx documents.  If None, it defaults to
 # "<project> v<release> documentation".
-#html_title = None
+# html_title = None
 
 # A shorter title for the navigation bar.  Default is the same as html_title.
-#html_short_title = None
+# html_short_title = None
 
 # The name of an image file (relative to this directory) to place at the top
 # of the sidebar.
-#html_logo = None
+# html_logo = None
 
 # The name of an image file (within the static path) to use as favicon of the
 # docs.  This file should be a Windows icon file (.ico) being 16x16 or 32x32
 # pixels large.
-#html_favicon = None
+# html_favicon = None
 
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,
 # so a file named "default.css" will overwrite the builtin "default.css".
-html_static_path = ['_static']
+# html_static_path = ["_static"]
 
 # Add any extra paths that contain custom files (such as robots.txt or
 # .htaccess) here, relative to this directory. These files are copied
 # directly to the root of the documentation.
-#html_extra_path = []
+# html_extra_path = []
 
 # If not '', a 'Last updated on:' timestamp is inserted at every page bottom,
 # using the given strftime format.
-#html_last_updated_fmt = '%b %d, %Y'
+# html_last_updated_fmt = '%b %d, %Y'
 
 # If true, SmartyPants will be used to convert quotes and dashes to
 # typographically correct entities.
-#html_use_smartypants = True
+# html_use_smartypants = True
 
 # Custom sidebar templates, maps document names to template names.
-#html_sidebars = {}
+# html_sidebars = {}
 
 # Additional templates that should be rendered to pages, maps page names to
 # template names.
-#html_additional_pages = {}
+# html_additional_pages = {}
 
 # If false, no module index is generated.
-#html_domain_indices = True
+# html_domain_indices = True
 
 # If false, no index is generated.
-#html_use_index = True
+# html_use_index = True
 
 # If true, the index is split into individual pages for each letter.
-#html_split_index = False
+# html_split_index = False
 
 # If true, links to the reST sources are added to the pages.
-#html_show_sourcelink = True
+# html_show_sourcelink = True
 
 # If true, "Created using Sphinx" is shown in the HTML footer. Default is True.
-#html_show_sphinx = True
+# html_show_sphinx = True
 
 # If true, "(C) Copyright ..." is shown in the HTML footer. Default is True.
-#html_show_copyright = True
+# html_show_copyright = True
 
 # If true, an OpenSearch description file will be output, and all pages will
 # contain a <link> tag referring to it.  The value of this option must be the
 # base URL from which the finished HTML is served.
-#html_use_opensearch = ''
+# html_use_opensearch = ''
 
 # This is the file name suffix for HTML files (e.g. ".xhtml").
-#html_file_suffix = None
+# html_file_suffix = None
 
 # Language to be used for generating the HTML full-text search index.
 # Sphinx supports the following languages:
 #   'da', 'de', 'en', 'es', 'fi', 'fr', 'hu', 'it', 'ja'
 #   'nl', 'no', 'pt', 'ro', 'ru', 'sv', 'tr'
-#html_search_language = 'en'
+# html_search_language = 'en'
 
 # A dictionary with options for the search language support, empty by default.
 # Now only 'ja' uses this config value
-#html_search_options = {'type': 'default'}
+# html_search_options = {'type': 'default'}
 
 # The name of a javascript file (relative to the configuration directory) that
 # implements a search results scorer. If empty, the default will be used.
-#html_search_scorer = 'scorer.js'
+# html_search_scorer = 'scorer.js'
 
 # Output file base name for HTML help builder.
-htmlhelp_basename = 'python_exampledoc'
+htmlhelp_basename = "python_exampledoc"
 
 # -- Options for LaTeX output ---------------------------------------------
 
 latex_elements = {
-# The paper size ('letterpaper' or 'a4paper').
-#'papersize': 'letterpaper',
-
-# The font size ('10pt', '11pt' or '12pt').
-#'pointsize': '10pt',
-
-# Additional stuff for the LaTeX preamble.
-#'preamble': '',
-
-# Latex figure (float) alignment
-#'figure_align': 'htbp',
+    # The paper size ('letterpaper' or 'a4paper').
+    #'papersize': 'letterpaper',
+    # The font size ('10pt', '11pt' or '12pt').
+    #'pointsize': '10pt',
+    # Additional stuff for the LaTeX preamble.
+    #'preamble': '',
+    # Latex figure (float) alignment
+    #'figure_align': 'htbp',
 }
 
 # Grouping the document tree into LaTeX files. List of tuples
 # (source start file, target name, title,
 #  author, documentclass [howto, manual, or own class]).
 latex_documents = [
-    (master_doc, 'python_example.tex', u'python_example Documentation',
-     u'Sylvain Corlay', 'manual'),
+    (
+        master_doc,
+        "python_example.tex",
+        "python_example Documentation",
+        "Sylvain Corlay",
+        "manual",
+    ),
 ]
 
 # The name of an image file (relative to this directory) to place at the top of
 # the title page.
-#latex_logo = None
+# latex_logo = None
 
 # For "manual" documents, if this is true, then toplevel headings are parts,
 # not chapters.
-#latex_use_parts = False
+# latex_use_parts = False
 
 # If true, show page references after internal links.
-#latex_show_pagerefs = False
+# latex_show_pagerefs = False
 
 # If true, show URL addresses after external links.
-#latex_show_urls = False
+# latex_show_urls = False
 
 # Documents to append as an appendix to all manuals.
-#latex_appendices = []
+# latex_appendices = []
 
 # If false, no module index is generated.
-#latex_domain_indices = True
+# latex_domain_indices = True
 
 
 # -- Options for manual page output ---------------------------------------
@@ -258,12 +257,11 @@
 # One entry per manual page. List of tuples
 # (source start file, name, description, authors, manual section).
 man_pages = [
-    (master_doc, 'python_example', u'python_example Documentation',
-     [author], 1)
+    (master_doc, "python_example", "python_example Documentation", [author], 1)
 ]
 
 # If true, show URL addresses after external links.
-#man_show_urls = False
+# man_show_urls = False
 
 
 # -- Options for Texinfo output -------------------------------------------
@@ -272,23 +270,29 @@
 # (source start file, target name, title, author,
 #  dir menu entry, description, category)
 texinfo_documents = [
-    (master_doc, 'python_example', u'python_example Documentation',
-     author, 'python_example', 'One line description of project.',
-     'Miscellaneous'),
+    (
+        master_doc,
+        "python_example",
+        "python_example Documentation",
+        author,
+        "python_example",
+        "One line description of project.",
+        "Miscellaneous",
+    ),
 ]
 
 # Documents to append as an appendix to all manuals.
-#texinfo_appendices = []
+# texinfo_appendices = []
 
 # If false, no module index is generated.
-#texinfo_domain_indices = True
+# texinfo_domain_indices = True
 
 # How to display URL addresses: 'footnote', 'no', or 'inline'.
-#texinfo_show_urls = 'footnote'
+# texinfo_show_urls = 'footnote'
 
 # If true, do not generate a @detailmenu in the "Top" node's menu.
-#texinfo_no_detailmenu = False
+# texinfo_no_detailmenu = False
 
 
 # Example configuration for intersphinx: refer to the Python standard library.
-intersphinx_mapping = {'https://docs.python.org/': None}
+intersphinx_mapping = {"python": ("https://docs.python.org/", None)}
diff --git a/docs/index.rst b/docs/index.rst
index 998e67bb..4b3ddca5 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -7,4 +7,3 @@ Contents:
    :maxdepth: 2
 
    python_example
-
diff --git a/docs/make.bat b/docs/make.bat
index 460bef91..a81981e1 100644
--- a/docs/make.bat
+++ b/docs/make.bat
@@ -3,48 +3,48 @@
 REM Command file for Sphinx documentation
 
 if "%SPHINXBUILD%" == "" (
-	set SPHINXBUILD=sphinx-build
+    set SPHINXBUILD=sphinx-build
 )
 set BUILDDIR=_build
 set ALLSPHINXOPTS=-d %BUILDDIR%/doctrees %SPHINXOPTS% .
 set I18NSPHINXOPTS=%SPHINXOPTS% .
 if NOT "%PAPER%" == "" (
-	set ALLSPHINXOPTS=-D latex_paper_size=%PAPER% %ALLSPHINXOPTS%
-	set I18NSPHINXOPTS=-D latex_paper_size=%PAPER% %I18NSPHINXOPTS%
+    set ALLSPHINXOPTS=-D latex_paper_size=%PAPER% %ALLSPHINXOPTS%
+    set I18NSPHINXOPTS=-D latex_paper_size=%PAPER% %I18NSPHINXOPTS%
 )
 
 if "%1" == "" goto help
 
 if "%1" == "help" (
-	:help
-	echo.Please use `make ^<target^>` where ^<target^> is one of
-	echo.  html       to make standalone HTML files
-	echo.  dirhtml    to make HTML files named index.html in directories
-	echo.  singlehtml to make a single large HTML file
-	echo.  pickle     to make pickle files
-	echo.  json       to make JSON files
-	echo.  htmlhelp   to make HTML files and a HTML help project
-	echo.  qthelp     to make HTML files and a qthelp project
-	echo.  devhelp    to make HTML files and a Devhelp project
-	echo.  epub       to make an epub
-	echo.  latex      to make LaTeX files, you can set PAPER=a4 or PAPER=letter
-	echo.  text       to make text files
-	echo.  man        to make manual pages
-	echo.  texinfo    to make Texinfo files
-	echo.  gettext    to make PO message catalogs
-	echo.  changes    to make an overview over all changed/added/deprecated items
-	echo.  xml        to make Docutils-native XML files
-	echo.  pseudoxml  to make pseudoxml-XML files for display purposes
-	echo.  linkcheck  to check all external links for integrity
-	echo.  doctest    to run all doctests embedded in the documentation if enabled
-	echo.  coverage   to run coverage check of the documentation if enabled
-	goto end
+    :help
+    echo.Please use `make ^<target^>` where ^<target^> is one of
+    echo.  html       to make standalone HTML files
+    echo.  dirhtml    to make HTML files named index.html in directories
+    echo.  singlehtml to make a single large HTML file
+    echo.  pickle     to make pickle files
+    echo.  json       to make JSON files
+    echo.  htmlhelp   to make HTML files and a HTML help project
+    echo.  qthelp     to make HTML files and a qthelp project
+    echo.  devhelp    to make HTML files and a Devhelp project
+    echo.  epub       to make an epub
+    echo.  latex      to make LaTeX files, you can set PAPER=a4 or PAPER=letter
+    echo.  text       to make text files
+    echo.  man        to make manual pages
+    echo.  texinfo    to make Texinfo files
+    echo.  gettext    to make PO message catalogs
+    echo.  changes    to make an overview over all changed/added/deprecated items
+    echo.  xml        to make Docutils-native XML files
+    echo.  pseudoxml  to make pseudoxml-XML files for display purposes
+    echo.  linkcheck  to check all external links for integrity
+    echo.  doctest    to run all doctests embedded in the documentation if enabled
+    echo.  coverage   to run coverage check of the documentation if enabled
+    goto end
 )
 
 if "%1" == "clean" (
-	for /d %%i in (%BUILDDIR%\*) do rmdir /q /s %%i
-	del /q /s %BUILDDIR%\*
-	goto end
+    for /d %%i in (%BUILDDIR%\*) do rmdir /q /s %%i
+    del /q /s %BUILDDIR%\*
+    goto end
 )
 
 
@@ -58,206 +58,206 @@ goto sphinx_ok
 set SPHINXBUILD=python -m sphinx.__init__
 %SPHINXBUILD% 2> nul
 if errorlevel 9009 (
-	echo.
-	echo.The 'sphinx-build' command was not found. Make sure you have Sphinx
-	echo.installed, then set the SPHINXBUILD environment variable to point
-	echo.to the full path of the 'sphinx-build' executable. Alternatively you
-	echo.may add the Sphinx directory to PATH.
-	echo.
-	echo.If you don't have Sphinx installed, grab it from
-	echo.http://sphinx-doc.org/
-	exit /b 1
+    echo.
+    echo.The 'sphinx-build' command was not found. Make sure you have Sphinx
+    echo.installed, then set the SPHINXBUILD environment variable to point
+    echo.to the full path of the 'sphinx-build' executable. Alternatively you
+    echo.may add the Sphinx directory to PATH.
+    echo.
+    echo.If you don't have Sphinx installed, grab it from
+    echo.http://sphinx-doc.org/
+    exit /b 1
 )
 
 :sphinx_ok
 
 
 if "%1" == "html" (
-	%SPHINXBUILD% -b html %ALLSPHINXOPTS% %BUILDDIR%/html
-	if errorlevel 1 exit /b 1
-	echo.
-	echo.Build finished. The HTML pages are in %BUILDDIR%/html.
-	goto end
+    %SPHINXBUILD% -b html %ALLSPHINXOPTS% %BUILDDIR%/html
+    if errorlevel 1 exit /b 1
+    echo.
+    echo.Build finished. The HTML pages are in %BUILDDIR%/html.
+    goto end
 )
 
 if "%1" == "dirhtml" (
-	%SPHINXBUILD% -b dirhtml %ALLSPHINXOPTS% %BUILDDIR%/dirhtml
-	if errorlevel 1 exit /b 1
-	echo.
-	echo.Build finished. The HTML pages are in %BUILDDIR%/dirhtml.
-	goto end
+    %SPHINXBUILD% -b dirhtml %ALLSPHINXOPTS% %BUILDDIR%/dirhtml
+    if errorlevel 1 exit /b 1
+    echo.
+    echo.Build finished. The HTML pages are in %BUILDDIR%/dirhtml.
+    goto end
 )
 
 if "%1" == "singlehtml" (
-	%SPHINXBUILD% -b singlehtml %ALLSPHINXOPTS% %BUILDDIR%/singlehtml
-	if errorlevel 1 exit /b 1
-	echo.
-	echo.Build finished. The HTML pages are in %BUILDDIR%/singlehtml.
-	goto end
+    %SPHINXBUILD% -b singlehtml %ALLSPHINXOPTS% %BUILDDIR%/singlehtml
+    if errorlevel 1 exit /b 1
+    echo.
+    echo.Build finished. The HTML pages are in %BUILDDIR%/singlehtml.
+    goto end
 )
 
 if "%1" == "pickle" (
-	%SPHINXBUILD% -b pickle %ALLSPHINXOPTS% %BUILDDIR%/pickle
-	if errorlevel 1 exit /b 1
-	echo.
-	echo.Build finished; now you can process the pickle files.
-	goto end
+    %SPHINXBUILD% -b pickle %ALLSPHINXOPTS% %BUILDDIR%/pickle
+    if errorlevel 1 exit /b 1
+    echo.
+    echo.Build finished; now you can process the pickle files.
+    goto end
 )
 
 if "%1" == "json" (
-	%SPHINXBUILD% -b json %ALLSPHINXOPTS% %BUILDDIR%/json
-	if errorlevel 1 exit /b 1
-	echo.
-	echo.Build finished; now you can process the JSON files.
-	goto end
+    %SPHINXBUILD% -b json %ALLSPHINXOPTS% %BUILDDIR%/json
+    if errorlevel 1 exit /b 1
+    echo.
+    echo.Build finished; now you can process the JSON files.
+    goto end
 )
 
 if "%1" == "htmlhelp" (
-	%SPHINXBUILD% -b htmlhelp %ALLSPHINXOPTS% %BUILDDIR%/htmlhelp
-	if errorlevel 1 exit /b 1
-	echo.
-	echo.Build finished; now you can run HTML Help Workshop with the ^
+    %SPHINXBUILD% -b htmlhelp %ALLSPHINXOPTS% %BUILDDIR%/htmlhelp
+    if errorlevel 1 exit /b 1
+    echo.
+    echo.Build finished; now you can run HTML Help Workshop with the ^
 .hhp project file in %BUILDDIR%/htmlhelp.
-	goto end
+    goto end
 )
 
 if "%1" == "qthelp" (
-	%SPHINXBUILD% -b qthelp %ALLSPHINXOPTS% %BUILDDIR%/qthelp
-	if errorlevel 1 exit /b 1
-	echo.
-	echo.Build finished; now you can run "qcollectiongenerator" with the ^
+    %SPHINXBUILD% -b qthelp %ALLSPHINXOPTS% %BUILDDIR%/qthelp
+    if errorlevel 1 exit /b 1
+    echo.
+    echo.Build finished; now you can run "qcollectiongenerator" with the ^
 .qhcp project file in %BUILDDIR%/qthelp, like this:
-	echo.^> qcollectiongenerator %BUILDDIR%\qthelp\python_example.qhcp
-	echo.To view the help file:
-	echo.^> assistant -collectionFile %BUILDDIR%\qthelp\python_example.ghc
-	goto end
+    echo.^> qcollectiongenerator %BUILDDIR%\qthelp\python_example.qhcp
+    echo.To view the help file:
+    echo.^> assistant -collectionFile %BUILDDIR%\qthelp\python_example.ghc
+    goto end
 )
 
 if "%1" == "devhelp" (
-	%SPHINXBUILD% -b devhelp %ALLSPHINXOPTS% %BUILDDIR%/devhelp
-	if errorlevel 1 exit /b 1
-	echo.
-	echo.Build finished.
-	goto end
+    %SPHINXBUILD% -b devhelp %ALLSPHINXOPTS% %BUILDDIR%/devhelp
+    if errorlevel 1 exit /b 1
+    echo.
+    echo.Build finished.
+    goto end
 )
 
 if "%1" == "epub" (
-	%SPHINXBUILD% -b epub %ALLSPHINXOPTS% %BUILDDIR%/epub
-	if errorlevel 1 exit /b 1
-	echo.
-	echo.Build finished. The epub file is in %BUILDDIR%/epub.
-	goto end
+    %SPHINXBUILD% -b epub %ALLSPHINXOPTS% %BUILDDIR%/epub
+    if errorlevel 1 exit /b 1
+    echo.
+    echo.Build finished. The epub file is in %BUILDDIR%/epub.
+    goto end
 )
 
 if "%1" == "latex" (
-	%SPHINXBUILD% -b latex %ALLSPHINXOPTS% %BUILDDIR%/latex
-	if errorlevel 1 exit /b 1
-	echo.
-	echo.Build finished; the LaTeX files are in %BUILDDIR%/latex.
-	goto end
+    %SPHINXBUILD% -b latex %ALLSPHINXOPTS% %BUILDDIR%/latex
+    if errorlevel 1 exit /b 1
+    echo.
+    echo.Build finished; the LaTeX files are in %BUILDDIR%/latex.
+    goto end
 )
 
 if "%1" == "latexpdf" (
-	%SPHINXBUILD% -b latex %ALLSPHINXOPTS% %BUILDDIR%/latex
-	cd %BUILDDIR%/latex
-	make all-pdf
-	cd %~dp0
-	echo.
-	echo.Build finished; the PDF files are in %BUILDDIR%/latex.
-	goto end
+    %SPHINXBUILD% -b latex %ALLSPHINXOPTS% %BUILDDIR%/latex
+    cd %BUILDDIR%/latex
+    make all-pdf
+    cd %~dp0
+    echo.
+    echo.Build finished; the PDF files are in %BUILDDIR%/latex.
+    goto end
 )
 
 if "%1" == "latexpdfja" (
-	%SPHINXBUILD% -b latex %ALLSPHINXOPTS% %BUILDDIR%/latex
-	cd %BUILDDIR%/latex
-	make all-pdf-ja
-	cd %~dp0
-	echo.
-	echo.Build finished; the PDF files are in %BUILDDIR%/latex.
-	goto end
+    %SPHINXBUILD% -b latex %ALLSPHINXOPTS% %BUILDDIR%/latex
+    cd %BUILDDIR%/latex
+    make all-pdf-ja
+    cd %~dp0
+    echo.
+    echo.Build finished; the PDF files are in %BUILDDIR%/latex.
+    goto end
 )
 
 if "%1" == "text" (
-	%SPHINXBUILD% -b text %ALLSPHINXOPTS% %BUILDDIR%/text
-	if errorlevel 1 exit /b 1
-	echo.
-	echo.Build finished. The text files are in %BUILDDIR%/text.
-	goto end
+    %SPHINXBUILD% -b text %ALLSPHINXOPTS% %BUILDDIR%/text
+    if errorlevel 1 exit /b 1
+    echo.
+    echo.Build finished. The text files are in %BUILDDIR%/text.
+    goto end
 )
 
 if "%1" == "man" (
-	%SPHINXBUILD% -b man %ALLSPHINXOPTS% %BUILDDIR%/man
-	if errorlevel 1 exit /b 1
-	echo.
-	echo.Build finished. The manual pages are in %BUILDDIR%/man.
-	goto end
+    %SPHINXBUILD% -b man %ALLSPHINXOPTS% %BUILDDIR%/man
+    if errorlevel 1 exit /b 1
+    echo.
+    echo.Build finished. The manual pages are in %BUILDDIR%/man.
+    goto end
 )
 
 if "%1" == "texinfo" (
-	%SPHINXBUILD% -b texinfo %ALLSPHINXOPTS% %BUILDDIR%/texinfo
-	if errorlevel 1 exit /b 1
-	echo.
-	echo.Build finished. The Texinfo files are in %BUILDDIR%/texinfo.
-	goto end
+    %SPHINXBUILD% -b texinfo %ALLSPHINXOPTS% %BUILDDIR%/texinfo
+    if errorlevel 1 exit /b 1
+    echo.
+    echo.Build finished. The Texinfo files are in %BUILDDIR%/texinfo.
+    goto end
 )
 
 if "%1" == "gettext" (
-	%SPHINXBUILD% -b gettext %I18NSPHINXOPTS% %BUILDDIR%/locale
-	if errorlevel 1 exit /b 1
-	echo.
-	echo.Build finished. The message catalogs are in %BUILDDIR%/locale.
-	goto end
+    %SPHINXBUILD% -b gettext %I18NSPHINXOPTS% %BUILDDIR%/locale
+    if errorlevel 1 exit /b 1
+    echo.
+    echo.Build finished. The message catalogs are in %BUILDDIR%/locale.
+    goto end
 )
 
 if "%1" == "changes" (
-	%SPHINXBUILD% -b changes %ALLSPHINXOPTS% %BUILDDIR%/changes
-	if errorlevel 1 exit /b 1
-	echo.
-	echo.The overview file is in %BUILDDIR%/changes.
-	goto end
+    %SPHINXBUILD% -b changes %ALLSPHINXOPTS% %BUILDDIR%/changes
+    if errorlevel 1 exit /b 1
+    echo.
+    echo.The overview file is in %BUILDDIR%/changes.
+    goto end
 )
 
 if "%1" == "linkcheck" (
-	%SPHINXBUILD% -b linkcheck %ALLSPHINXOPTS% %BUILDDIR%/linkcheck
-	if errorlevel 1 exit /b 1
-	echo.
-	echo.Link check complete; look for any errors in the above output ^
+    %SPHINXBUILD% -b linkcheck %ALLSPHINXOPTS% %BUILDDIR%/linkcheck
+    if errorlevel 1 exit /b 1
+    echo.
+    echo.Link check complete; look for any errors in the above output ^
 or in %BUILDDIR%/linkcheck/output.txt.
-	goto end
+    goto end
 )
 
 if "%1" == "doctest" (
-	%SPHINXBUILD% -b doctest %ALLSPHINXOPTS% %BUILDDIR%/doctest
-	if errorlevel 1 exit /b 1
-	echo.
-	echo.Testing of doctests in the sources finished, look at the ^
+    %SPHINXBUILD% -b doctest %ALLSPHINXOPTS% %BUILDDIR%/doctest
+    if errorlevel 1 exit /b 1
+    echo.
+    echo.Testing of doctests in the sources finished, look at the ^
 results in %BUILDDIR%/doctest/output.txt.
-	goto end
+    goto end
 )
 
 if "%1" == "coverage" (
-	%SPHINXBUILD% -b coverage %ALLSPHINXOPTS% %BUILDDIR%/coverage
-	if errorlevel 1 exit /b 1
-	echo.
-	echo.Testing of coverage in the sources finished, look at the ^
+    %SPHINXBUILD% -b coverage %ALLSPHINXOPTS% %BUILDDIR%/coverage
+    if errorlevel 1 exit /b 1
+    echo.
+    echo.Testing of coverage in the sources finished, look at the ^
 results in %BUILDDIR%/coverage/python.txt.
-	goto end
+    goto end
 )
 
 if "%1" == "xml" (
-	%SPHINXBUILD% -b xml %ALLSPHINXOPTS% %BUILDDIR%/xml
-	if errorlevel 1 exit /b 1
-	echo.
-	echo.Build finished. The XML files are in %BUILDDIR%/xml.
-	goto end
+    %SPHINXBUILD% -b xml %ALLSPHINXOPTS% %BUILDDIR%/xml
+    if errorlevel 1 exit /b 1
+    echo.
+    echo.Build finished. The XML files are in %BUILDDIR%/xml.
+    goto end
 )
 
 if "%1" == "pseudoxml" (
-	%SPHINXBUILD% -b pseudoxml %ALLSPHINXOPTS% %BUILDDIR%/pseudoxml
-	if errorlevel 1 exit /b 1
-	echo.
-	echo.Build finished. The pseudo-XML files are in %BUILDDIR%/pseudoxml.
-	goto end
+    %SPHINXBUILD% -b pseudoxml %ALLSPHINXOPTS% %BUILDDIR%/pseudoxml
+    if errorlevel 1 exit /b 1
+    echo.
+    echo.Build finished. The pseudo-XML files are in %BUILDDIR%/pseudoxml.
+    goto end
 )
 
 :end
diff --git a/docs/python_example.rst b/docs/python_example.rst
index 2048d23f..51e418dd 100644
--- a/docs/python_example.rst
+++ b/docs/python_example.rst
@@ -1 +1,4 @@
+The python_example module
+=========================
+
 .. automodule:: python_example
diff --git a/pyproject.toml b/pyproject.toml
index 89ae1ed3..0c7cc8e0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,8 +1,24 @@
 [build-system]
 requires = [
     "setuptools>=42",
-    "wheel",
-    "pybind11>=2.6.0",
+    "pybind11>=2.10.0",
 ]
-
 build-backend = "setuptools.build_meta"
+
+
+[tool.cibuildwheel]
+test-command = "python {project}/tests/test.py"
+test-skip = "*universal2:arm64"
+
+
+[tool.ruff]
+target-version = "py39"
+
+[tool.ruff.lint]
+extend-select = [
+  "B",   # flake8-bugbear
+  "I",   # isort
+  "PGH", # pygrep-hooks
+  "RUF", # Ruff-specific
+  "UP",  # pyupgrade
+]
diff --git a/setup.py b/setup.py
index 38ea7f7f..1824a0b9 100644
--- a/setup.py
+++ b/setup.py
@@ -1,10 +1,6 @@
-from setuptools import setup
-
 # Available at setup time due to pyproject.toml
 from pybind11.setup_helpers import Pybind11Extension, build_ext
-from pybind11 import get_cmake_dir
-
-import sys
+from setuptools import setup
 
 __version__ = "0.0.1"
 
@@ -18,11 +14,12 @@
 #   reproducible builds (https://github.com/pybind/python_example/pull/53)
 
 ext_modules = [
-    Pybind11Extension("python_example",
+    Pybind11Extension(
+        "python_example",
         ["src/main.cpp"],
         # Example: passing in the version to the compiled code
-        define_macros = [('VERSION_INFO', __version__)],
-        ),
+        define_macros=[("VERSION_INFO", __version__)],
+    ),
 ]
 
 setup(
@@ -39,4 +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",
 )
diff --git a/tests/test.py b/tests/test.py
index f877b621..5a72e5f2 100644
--- a/tests/test.py
+++ b/tests/test.py
@@ -1,5 +1,5 @@
 import python_example as m
 
-assert m.__version__ == '0.0.1'
+assert m.__version__ == "0.0.1"
 assert m.add(1, 2) == 3
 assert m.subtract(1, 2) == -1