diff --git a/.github/FUNDING.yml b/.github/FUNDING.yaml
similarity index 100%
rename from .github/FUNDING.yml
rename to .github/FUNDING.yaml
diff --git a/.github/dependabot.yml b/.github/dependabot.yaml
similarity index 100%
rename from .github/dependabot.yml
rename to .github/dependabot.yaml
diff --git a/.github/workflows/readme_example.yaml b/.github/workflows/readme_example.yaml
index a7d8c8e..911694e 100644
--- a/.github/workflows/readme_example.yaml
+++ b/.github/workflows/readme_example.yaml
@@ -1,6 +1,6 @@
 # This file is a part of the detect-pythons project.
 # https://github.com/kurtmckee/detect-pythons
-# Copyright 2023 Kurt McKee <contactme@kurtmckee.org>
+# Copyright 2023-2025 Kurt McKee <contactme@kurtmckee.org>
 # SPDX-License-Identifier: MIT
 
 # This workflow exists for several purposes:
@@ -46,13 +46,13 @@ jobs:
       - uses: "actions/setup-python@v5"
         with:
           python-version: |
-            graalpy-23.1
-            pypy-3.10
-            3.12
+            graalpy-24
+            pypy-3.11
+            3.13
 
       - uses: "kurtmckee/detect-pythons@v1"
 
-      - uses: "actions/cache@v3"
+      - uses: "actions/cache@v4"
         id: "restore-cache"
         with:
           # You may need to augment the list of files to hash.
@@ -64,7 +64,8 @@ jobs:
 
       - name: "Identify .venv path"
         shell: "bash"
-        run: "echo 'venv-path=.venv/${{ runner.os == 'Windows' && 'Scripts' || 'bin' }}' >> $GITHUB_ENV"
+        run: |
+          echo 'venv-path=.venv/${{ runner.os == 'Windows' && 'Scripts' || 'bin' }}' >> "$GITHUB_ENV"
 
       - name: "Create a virtual environment"
         if: "steps.restore-cache.outputs.cache-hit == false"
@@ -95,7 +96,7 @@ jobs:
 
       - uses: "kurtmckee/detect-pythons@v1"
 
-      - uses: "actions/cache@v3"
+      - uses: "actions/cache@v4"
         id: "restore-cache"
         with:
           # You may need to augment the list of files to hash.
@@ -107,7 +108,8 @@ jobs:
 
       - name: "Identify .venv path"
         shell: "bash"
-        run: "echo 'venv-path=.venv/${{ runner.os == 'Windows' && 'Scripts' || 'bin' }}' >> $GITHUB_ENV"
+        run: |
+          echo 'venv-path=.venv/${{ runner.os == 'Windows' && 'Scripts' || 'bin' }}' >> "$GITHUB_ENV"
 
       - name: "Create a virtual environment"
         if: "steps.restore-cache.outputs.cache-hit == false"
diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index 37f6ad4..8a59960 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -1,4 +1,4 @@
-name: "🔬 Test"
+name: "🧪 Test"
 
 on:
   pull_request: null
@@ -8,70 +8,52 @@ on:
       - "releases"
 
 jobs:
-  tox:
-    name: "Tox (${{ matrix.os.name }})"
+  code:
+    name:
+      "Code (${{
+        (startswith(matrix.runner, 'ubuntu') && 'Linux')
+        || (startswith(matrix.runner, 'macos') && 'macOS')
+        || (startswith(matrix.runner, 'windows') && 'Windows')
+      }})"
 
     strategy:
-      matrix:
-        os:
-          - name: "Linux"
-            runner: "ubuntu-latest"
-          - name: "macOS"
-            runner: "macos-latest"
-          - name: "Windows"
-            runner: "windows-latest"
       fail-fast: false
+      matrix:
+        runner:
+          - "ubuntu-latest"
+          - "macos-latest"
+          - "windows-latest"
+
+        # Each operating system should test all Python interpreters simultaneously.
+        #
+        # Note: The CPython interpreter versions should be in ascending order
+        # because the last-listed version will be the default CPython version.
+        #
+        include:
+          - cpythons:
+              - "3.8"
+              - "3.9"
+              - "3.10"
+              - "3.11"
+              - "3.12"
+              - "3.13"
+            cpython-beta: "3.14"
+            pypys:
+              - "3.8"
+              - "3.9"
+              - "3.10"
+              - "3.11"
+
+    uses: "kurtmckee/github-workflows/.github/workflows/tox.yaml@ca26472ada33aa277527450aa46436f530e3d2c1" # v1.4
+    with:
+      config: "${{ toJSON(matrix) }}"
 
-    runs-on: "${{ matrix.os.runner }}"
-    steps:
-      - name: "Checkout the repository"
-        uses: "actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11" # v4.1.1
-
-      - name: "Setup Pythons"
-        uses: "actions/setup-python@0a5c61591373683505ea898e09a3ea4f39ef2b9c" # v5.0.0
-        with:
-          python-version: |
-            pypy3.8
-            pypy3.9
-            pypy3.10
-            3.8
-            3.9
-            3.10
-            3.11
-            3.12
-          allow-prereleases: true
-          cache: "pip"
-
-      - name: "Detect Pythons"
-        uses: "./"
-
-      - name: "Restore cache"
-        id: "restore-cache"
-        uses: "actions/cache@704facf57e6136b1bc63b828d79edcd491f0ee84" # v3.3.2
-        with:
-          path: |
-            .tox/
-            .venv
-          key: "tox-os=${{ matrix.os.runner }}-hash=${{ hashFiles('.python-identifiers', 'tox.ini') }}"
-
-      - name: "Identify .venv path"
-        shell: "bash"
-        run: "echo 'venv-path=.venv/${{ runner.os == 'Windows' && 'Scripts' || 'bin' }}' >> $GITHUB_ENV"
-
-      - name: "Create a virtual environment"
-        if: "steps.restore-cache.outputs.cache-hit == false"
-        run: |
-          python -m venv .venv
-          ${{ env.venv-path }}/python -m pip install --upgrade pip setuptools wheel
-          ${{ env.venv-path }}/pip install tox
-
-      - name: "Run the test suite"
-        run: "${{ env.venv-path }}/tox"
 
   inputs:
     name: "Inputs (${{ matrix.os.name }})"
 
     strategy:
+      fail-fast: false
       matrix:
         os:
           - name: "Linux"
@@ -80,12 +62,11 @@ jobs:
             runner: "macos-latest"
           - name: "Windows"
             runner: "windows-latest"
-      fail-fast: false
 
     runs-on: "${{ matrix.os.runner }}"
     steps:
       - name: "Checkout the repository"
-        uses: "actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11" # v4.1.1
+        uses: "actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683" # v4.2.2
 
       - name: "Test: Disable output file"
         uses: "./"
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 4c18700..3b1146d 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,6 +1,9 @@
 ci:
   autoupdate_schedule: "monthly"
 
+default_language_version:
+  python: "python3.13"
+
 repos:
   - repo: "meta"
     hooks:
@@ -8,7 +11,7 @@ repos:
       - id: "check-useless-excludes"
 
   - repo: "https://github.com/pre-commit/pre-commit-hooks"
-    rev: "v4.5.0"
+    rev: "v5.0.0"
     hooks:
       - id: "check-yaml"
       - id: "check-added-large-files"
@@ -23,34 +26,39 @@ repos:
     hooks:
       - id: "update-headers"
 
+  - repo: "https://github.com/sirosen/slyp"
+    rev: 0.8.2
+    hooks:
+      - id: "slyp"
+
   - repo: "https://github.com/psf/black-pre-commit-mirror"
-    rev: "23.12.0"
+    rev: "25.1.0"
     hooks:
       - id: "black"
 
   - repo: "https://github.com/pycqa/isort"
-    rev: "5.13.2"
+    rev: "6.0.1"
     hooks:
       - id: "isort"
 
   - repo: "https://github.com/pycqa/flake8"
-    rev: "6.1.0"
+    rev: "7.1.2"
     hooks:
       - id: "flake8"
         additional_dependencies:
-          - "flake8-bugbear==23.12.2"
+          - "flake8-bugbear==24.12.12"
 
-  - repo: "https://github.com/editorconfig-checker/editorconfig-checker.python"
-    rev: "2.7.3"
+  - repo: "https://github.com/editorconfig-checker/editorconfig-checker"
+    rev: "v3.2.0"
     hooks:
       - id: "editorconfig-checker"
-        # The README contain YAML samples indented with 2 spaces.
+        # The README contains YAML samples indented with 2 spaces.
         # The .editorconfig file requires 4 spaces for indentation,
         # so this pre-commit hook will ignore the README.
         exclude: "README.rst"
 
   - repo: "https://github.com/shellcheck-py/shellcheck-py"
-    rev: "v0.9.0.6"
+    rev: "v0.10.0.1"
     hooks:
       - id: "shellcheck"
         args:
@@ -66,7 +74,12 @@ repos:
         pass_filenames: false
 
   - repo: "https://github.com/python-jsonschema/check-jsonschema"
-    rev: "0.27.3"
+    rev: "0.31.2"
     hooks:
       - id: "check-github-workflows"
       - id: "check-dependabot"
+
+  - repo: "https://github.com/rhysd/actionlint"
+    rev: "v1.7.7"
+    hooks:
+      - id: "actionlint"
diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 76ef915..008691d 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -1,7 +1,7 @@
 ..
     This file is a part of the detect-pythons project.
     https://github.com/kurtmckee/detect-pythons
-    Copyright 2023 Kurt McKee <contactme@kurtmckee.org>
+    Copyright 2023-2025 Kurt McKee <contactme@kurtmckee.org>
     SPDX-License-Identifier: MIT
 
 ..
@@ -24,6 +24,23 @@ Please see the fragment files in the `changelog.d directory`_.
 
 ..  scriv-insert-here
 
+.. _changelog-1.1.1:
+
+1.1.1 - 2025-03-06
+==================
+
+Python support
+--------------
+
+*   Support CPython 3.13 and PyPy 3.11.
+*   Test against early versions of Python 3.14.
+
+Development
+-----------
+
+*   Migrate to PEP 621 project metadata.
+*   Migrate to a reusable CI workflow.
+
 .. _changelog-1.1.0:
 
 1.1.0 - 2023-12-16
diff --git a/LICENSE.txt b/LICENSE.txt
index a8c5822..f681486 100644
--- a/LICENSE.txt
+++ b/LICENSE.txt
@@ -1,6 +1,6 @@
 MIT License
 
-Copyright 2023 Kurt McKee <contactme@kurtmckee.org>
+Copyright 2023-2025 Kurt McKee <contactme@kurtmckee.org>
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/README.rst b/README.rst
index 6df9ea5..6d2efe9 100644
--- a/README.rst
+++ b/README.rst
@@ -1,7 +1,7 @@
 ..
     This file is a part of the detect-pythons project.
     https://github.com/kurtmckee/detect-pythons
-    Copyright 2023 Kurt McKee <contactme@kurtmckee.org>
+    Copyright 2023-2025 Kurt McKee <contactme@kurtmckee.org>
     SPDX-License-Identifier: MIT
 
 Detect Python interpreters
@@ -52,13 +52,13 @@ and tox test environments stored in ``.tox/``.
     - uses: "actions/setup-python@v5"
       with:
         python-version: |
-          graalpy-23.1
-          pypy-3.10
-          3.12
+          graalpy-24
+          pypy-3.11
+          3.13
 
     - uses: "kurtmckee/detect-pythons@v1"
 
-    - uses: "actions/cache@v3"
+    - uses: "actions/cache@v4"
       id: "restore-cache"
       with:
         # You may need to augment the list of files to hash.
@@ -70,7 +70,8 @@ and tox test environments stored in ``.tox/``.
 
     - name: "Identify .venv path"
       shell: "bash"
-      run: "echo 'venv-path=.venv/${{ runner.os == 'Windows' && 'Scripts' || 'bin' }}' >> $GITHUB_ENV"
+      run: |
+        echo 'venv-path=.venv/${{ runner.os == 'Windows' && 'Scripts' || 'bin' }}' >> "$GITHUB_ENV"
 
     - name: "Create a virtual environment"
       if: "steps.restore-cache.outputs.cache-hit == false"
@@ -153,8 +154,8 @@ System CPython interpreters
 ---------------------------
 
 GitHub's Linux and macOS runners have system CPython interpreters installed.
-These are available at paths like ``/usr/bin/python``,
-which contains no useful information.
+These are available at paths which contain no useful information,
+like ``/usr/bin/python``.
 
 For these interpreters, the interpreter is executed
 and the value of ``sysconfig.get_config_var("EXT_SUFFIX")`` is extracted.
@@ -166,31 +167,11 @@ This results in a value like the following:
     "Linux", "``.cpython-310-x86_64-linux-gnu.so``"
     "macOS", "``.cpython-311-darwin.so``"
 
-
-macOS runner variability
-------------------------
-
-At the time of writing, GitHub's macOS runners sometimes have CPython 2.7 pre-installed.
-CPython 2.7 doesn't have an ``EXT_SUFFIX`` config value,
-so ``detect-pythons`` constructs one.
+Extremely old Python versions might not have an ``EXT_SUFFIX`` value.
+For example, CPython 2.7 doesn't have this value.
+If this is detected then an equivalent value is constructed.
 
 ..  csv-table::
     :header: "Platform", "Constructed ``EXT_SUFFIX`` equivalent"
 
-    "macOS 12.6", "``.cpython-27-darwin-x86_64``"
-
-Note that CPython 2.7 is only installed *sometimes*; sometimes it isn't.
-This is because ``macos-latest`` is sometimes macOS 12.6, and sometimes it's macOS 12.7.
-See `actions/runner-images#8642`_ for more information.
-
-When using ``detect-pythons`` to help with cache-busting,
-this variability means that you may see two caches appear in regular use
-for your macOS-based workflows;
-one that is valid when CPython 2.7 is pre-installed,
-and another that is valid when it *isn't* installed.
-
-
-..  Links
-..  -----
-..
-..  _actions/runner-images#8642: https://github.com/actions/runner-images/issues/8642
+    "macOS", "``.cpython-27-darwin-x86_64``"
diff --git a/action.yml b/action.yml
index 21df35a..d9c4fd5 100644
--- a/action.yml
+++ b/action.yml
@@ -1,6 +1,6 @@
 # This file is a part of the detect-pythons project.
 # https://github.com/kurtmckee/detect-pythons
-# Copyright 2023 Kurt McKee <contactme@kurtmckee.org>
+# Copyright 2023-2025 Kurt McKee <contactme@kurtmckee.org>
 # SPDX-License-Identifier: MIT
 
 author: "Kurt McKee"
diff --git a/pyproject.toml b/pyproject.toml
index 55c90e8..17ccaf0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,20 +1,35 @@
-[tool.poetry]
+[project]
 name = "detect_pythons"
-version = "1.1.0"
+version = "1.1.1"
 description = "A GitHub action to detect installed Pythons. Suitable for cache-busting."
-authors = ["Kurt McKee <contactme@kurtmckee.org>"]
+authors = [{ name = "Kurt McKee", email = "contactme@kurtmckee.org" }]
 license = "MIT"
 readme = "README.rst"
+requires-python = ">=3.8"
+classifiers = ["Private :: Do not Upload"]
 
+[build-system]
+requires = ["poetry-core>=2.0.0,<3.0.0"]
+build-backend = "poetry.core.masonry.api"
 
-[tool.poetry.dependencies]
-python = ">=3.8"
 
+# chipshot
+# --------
+
+[tool.chipshot]
+template = """
+This file is a part of the detect-pythons project.
+https://github.com/kurtmckee/detect-pythons
+Copyright 2023-{{ year }} Kurt McKee <contactme@kurtmckee.org>
+SPDX-License-Identifier: MIT
+"""
+exclusions = [
+    "changelog.d/",
+]
 
-[build-system]
-requires = ["poetry-core"]
-build-backend = "poetry.core.masonry.api"
 
+# coverage
+# --------
 
 [tool.coverage.run]
 parallel = true
@@ -24,28 +39,31 @@ source = [
     "tests",
 ]
 
-
 [tool.coverage.paths]
 source = [
     "src",
     "*/site-packages",
 ]
 
-
 [tool.coverage.report]
 skip_covered = true
 fail_under = 100
 
-
 [tool.coverage.html]
 skip_covered = false
 directory = "htmlcov/"
 
 
+# isort
+# -----
+
 [tool.isort]
 profile = "black"
 
 
+# pytest
+# ------
+
 [tool.pytest.ini_options]
 addopts = "--color=yes"
 filterwarnings = [
@@ -53,8 +71,11 @@ filterwarnings = [
 ]
 
 
+# scriv
+# -----
+
 [tool.scriv]
-version = "literal: pyproject.toml: tool.poetry.version"
+version = "literal: pyproject.toml: project.version"
 categories = [
     "Python support",
     "Added",
@@ -70,15 +91,3 @@ fragment_directory = "changelog.d"
 insert_marker = "scriv-insert-here"
 main_branches = ["main", "releases"]
 new_fragment_template = "file: fragment-template.rst.txt"
-
-
-[tool.chipshot]
-template = """
-This file is a part of the detect-pythons project.
-https://github.com/kurtmckee/detect-pythons
-Copyright 2023 Kurt McKee <contactme@kurtmckee.org>
-SPDX-License-Identifier: MIT
-"""
-exclusions = [
-    "changelog.d/",
-]
diff --git a/src/detect_pythons/detector.ps1 b/src/detect_pythons/detector.ps1
index 0f679f1..7f4f0e7 100644
--- a/src/detect_pythons/detector.ps1
+++ b/src/detect_pythons/detector.ps1
@@ -1,6 +1,6 @@
 # This file is a part of the detect-pythons project.
 # https://github.com/kurtmckee/detect-pythons
-# Copyright 2023 Kurt McKee <contactme@kurtmckee.org>
+# Copyright 2023-2025 Kurt McKee <contactme@kurtmckee.org>
 # SPDX-License-Identifier: MIT
 
 # Search paths in $PATH for Python interpreters.
diff --git a/src/detect_pythons/detector.sh b/src/detect_pythons/detector.sh
index be8f537..9a0f426 100644
--- a/src/detect_pythons/detector.sh
+++ b/src/detect_pythons/detector.sh
@@ -1,6 +1,6 @@
 # This file is a part of the detect-pythons project.
 # https://github.com/kurtmckee/detect-pythons
-# Copyright 2023 Kurt McKee <contactme@kurtmckee.org>
+# Copyright 2023-2025 Kurt McKee <contactme@kurtmckee.org>
 # SPDX-License-Identifier: MIT
 
 IDENTIFY_PY="${GITHUB_ACTION_PATH}/src/detect_pythons/identify.py"
diff --git a/src/detect_pythons/identify.py b/src/detect_pythons/identify.py
index 0e73d1c..57497c2 100644
--- a/src/detect_pythons/identify.py
+++ b/src/detect_pythons/identify.py
@@ -1,6 +1,6 @@
 # This file is a part of the detect-pythons project.
 # https://github.com/kurtmckee/detect-pythons
-# Copyright 2023 Kurt McKee <contactme@kurtmckee.org>
+# Copyright 2023-2025 Kurt McKee <contactme@kurtmckee.org>
 # SPDX-License-Identifier: MIT
 
 from __future__ import print_function
diff --git a/src/detect_pythons/sync_readme_example.py b/src/detect_pythons/sync_readme_example.py
index 71fe0a8..cb52d3a 100644
--- a/src/detect_pythons/sync_readme_example.py
+++ b/src/detect_pythons/sync_readme_example.py
@@ -1,6 +1,6 @@
 # This file is a part of the detect-pythons project.
 # https://github.com/kurtmckee/detect-pythons
-# Copyright 2023 Kurt McKee <contactme@kurtmckee.org>
+# Copyright 2023-2025 Kurt McKee <contactme@kurtmckee.org>
 # SPDX-License-Identifier: MIT
 
 import pathlib
diff --git a/tests/test_identify.py b/tests/test_identify.py
index a06b6a3..6a33abb 100644
--- a/tests/test_identify.py
+++ b/tests/test_identify.py
@@ -1,6 +1,6 @@
 # This file is a part of the detect-pythons project.
 # https://github.com/kurtmckee/detect-pythons
-# Copyright 2023 Kurt McKee <contactme@kurtmckee.org>
+# Copyright 2023-2025 Kurt McKee <contactme@kurtmckee.org>
 # SPDX-License-Identifier: MIT
 
 import platform
diff --git a/tests/test_sync_readme_example.py b/tests/test_sync_readme_example.py
index 8312871..9e888fc 100644
--- a/tests/test_sync_readme_example.py
+++ b/tests/test_sync_readme_example.py
@@ -1,6 +1,6 @@
 # This file is a part of the detect-pythons project.
 # https://github.com/kurtmckee/detect-pythons
-# Copyright 2023 Kurt McKee <contactme@kurtmckee.org>
+# Copyright 2023-2025 Kurt McKee <contactme@kurtmckee.org>
 # SPDX-License-Identifier: MIT
 
 import unittest.mock
diff --git a/tox.ini b/tox.ini
index 06b842d..e485d17 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,13 +1,12 @@
 [tox]
 min_version = 4.3.5
-
 envlist =
     coverage_erase
-    py{313, 312, 311, 310, 39, 38, py310, py39, py38}
+    py{3.14, 3.13, 3.12, 3.11, 3.10, 3.9, 3.8}
+    pypy{3.11, 3.10, 3.9, 3.8}
     coverage_report
-
-skip_missing_interpreters = True
-isolated_build = True
+labels =
+    update=update
 
 
 [testenv]
@@ -15,7 +14,7 @@ package = wheel
 wheel_build_env = build_wheel
 
 depends =
-    py{313, 312, 311, 310, 39, 38, py310, py39, py38}: coverage_erase
+    py{3.14, 3.13, 3.12, 3.11, 3.10, 3.9, 3.8}, pypy{3.11, 3.10, 3.9, 3.8}: coverage_erase
 deps =
     coverage[toml]
     pytest
@@ -25,7 +24,6 @@ commands =
 
 
 [testenv:coverage_erase]
-skipsdist = true
 skip_install = true
 deps = coverage[toml]
 commands = coverage erase
@@ -33,8 +31,7 @@ commands = coverage erase
 
 [testenv:coverage_report]
 depends =
-    py{313, 312, 311, 310, 39, 38, py310, py39, py38}
-skipsdist = true
+    py{3.14, 3.13, 3.12, 3.11, 3.10, 3.9, 3.8}, pypy{3.11, 3.10, 3.9, 3.8}
 skip_install = true
 deps = coverage[toml]
 commands_pre =
@@ -44,17 +41,20 @@ commands = coverage report
 
 
 [testenv:update]
+description = Update tool versions
+base_python = py3.13
+recreate = true
+skip_install = true
 deps =
     pre-commit
     upadup
-skip_install = true
 commands =
     # Update pre-commit hooks and additional dependencies.
     pre-commit autoupdate
     upadup
 
-    # Run pre-commit.
-    pre-commit run --all-files
+    # Run pre-commit immediately, but ignore its exit code.
+    - pre-commit run -a
 
 
 [flake8]