diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index cef2e96..14315e0 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -3,7 +3,7 @@ name: CI
 
 on:
   push:
-    branches: [trunk]
+    branches: [ trunk ]
   pull_request:
   workflow_dispatch:
 
@@ -12,7 +12,7 @@ env:
   PIP_DISABLE_PIP_VERSION_CHECK: "1"
   PIP_NO_PYTHON_VERSION_WARNING: "1"
 
-permissions: {}
+permissions: { }
 
 jobs:
   build-package:
@@ -23,6 +23,7 @@ jobs:
       - uses: actions/checkout@v4
         with:
           fetch-depth: 0
+          persist-credentials: false
 
       - uses: hynek/build-and-inspect-python-package@v2
         id: baipp
@@ -74,6 +75,8 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
+        with:
+          persist-credentials: false
       - uses: actions/setup-python@v5
         with:
           python-version: "3.12"
@@ -140,7 +143,7 @@ jobs:
       - run: tar xf dist/*.tar.gz --strip-components=1
       - uses: actions/setup-python@v5
         with:
-          python-version: "3.12"
+          python-version: "3.13"
       - name: Set up test runner
         run: |
           python -VV
@@ -148,9 +151,9 @@ jobs:
           python -Im pip install --upgrade nox
           python -Im nox --version
       - name: Check code formatting
-        run: "python -Im nox --non-interactive --error-on-external-run --tag formatters --python 3.12"
+        run: "python -Im nox --non-interactive --error-on-external-run --tag formatters --python 3.13"
       - name: Lint code
-        run: "python -Im nox --non-interactive --error-on-external-run --tag linters --python 3.12"
+        run: "python -Im nox --non-interactive --error-on-external-run --tag linters --python 3.13"
 
 
   check-package:
@@ -166,7 +169,7 @@ jobs:
       - run: tar xf dist/*.tar.gz --strip-components=1
       - uses: actions/setup-python@v5
         with:
-          python-version: "3.12"
+          python-version: "3.13"
       - name: Set up test runner
         run: |
           python -VV
@@ -174,7 +177,7 @@ jobs:
           python -Im pip install --upgrade nox
           python -Im nox --version
       - name: Check package
-        run: "python -Im nox --non-interactive --error-on-external-run --tag packaging --python 3.12"
+        run: "python -Im nox --non-interactive --error-on-external-run --tag packaging --python 3.13"
 
 
   required-checks-pass:
diff --git a/.gitignore b/.gitignore
index 8a33477..f90904f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -131,3 +131,10 @@ dmypy.json
 
 # Cython debug symbols
 cython_debug/
+
+# IDEs
+.idea/
+.vscode/
+
+# PDM local file.
+.pdm-python
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index ee9101f..80d0fc9 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -2,7 +2,7 @@
 # See https://pre-commit.com/hooks.html for more hooks
 repos:
 - repo: https://github.com/pre-commit/pre-commit-hooks
-  rev: v4.6.0
+  rev: v5.0.0
   hooks:
     - id: check-added-large-files
     - id: check-ast
@@ -16,10 +16,10 @@ repos:
     - id: end-of-file-fixer
     - id: trailing-whitespace
 - repo: https://github.com/psf/black
-  rev: 24.8.0
+  rev: 24.10.0
   hooks:
     - id: black
-      language_version: python3.8
+      language_version: python3.13
       name: black (Python formatter)
 - repo: https://github.com/pycqa/flake8
   rev: 7.1.1
diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 9a1d3b0..7ca56e5 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -7,7 +7,7 @@ version: 2
 build:
   os: ubuntu-22.04
   tools:
-    python: "3.11"
+    python: "3.12"
 
 sphinx:
   configuration: docs/conf.py
@@ -15,4 +15,5 @@ sphinx:
 python:
   install:
     - method: pip
-      path: .[docs]
+      path: .
+    - requirements: docs/requirements.txt
diff --git a/CONTRIBUTING.rst b/CONTRIBUTING.rst
new file mode 100644
index 0000000..8928c9e
--- /dev/null
+++ b/CONTRIBUTING.rst
@@ -0,0 +1,103 @@
+Contributor guide
+=================
+
+Contributions are welcome, and several things about this repository
+have been set up to make the process easier for everyone (including
+you!).
+
+
+Prerequisites
+-------------
+
+* Please use a code editor/IDE that supports `EditorConfig
+  <https://editorconfig.org>`_. Most editors do nowadays, so you
+  probably don't have to worry about it, but it will help to
+  automatically apply some formatting and style rules.
+
+* Please make sure you have `pre-commit <https://pre-commit.com>`_
+  installed, and in your local checkout of this repository run
+  ``pre-commit install`` to set up the pre-commit hooks.
+
+The following two tools are *required* for working with this
+repository:
+
+* `PDM <https://pdm-project.org/>`_
+
+* `nox <https://nox.thea.codes/en/stable/>`_
+
+You will also need at least one supported Python version. It is also
+recommended that you test against *all* the supported Python verisions
+before opening a pull request; you can use `PDM's Python installer
+<https://pdm-project.org/latest/usage/project/#install-python-interpreters-with-pdm>`_
+to install any versions of Python you need.
+
+
+Local setup
+-----------
+
+Once you have the tools above installed, run the following in the root
+of your git checkout::
+
+   pdm install
+
+This will create a local virtual environment and install
+``webcolors`` and its dependencies.
+
+
+Testing
+-------
+
+To run the tests, use ``nox``::
+
+   nox --tags tests
+
+By default this will run against as many supported Python versions as
+you have installed. To select a single specific Python version, you
+can run::
+
+   nox --tags tests --python "3.11"
+
+You can also run the full CI suite locally by just invoking
+``nox``. This will run the tests, check the documentation, lint the
+code and check formatting, and build a package and perform checks on
+it.
+
+For more information about available tasks, run ``nox --list`` or read
+the file ``noxfile.py`` in the root of your source checkout, or the
+testing documentation in the file ``docs/conformance.rst``.
+
+
+Code style
+----------
+
+The pre-commit hooks will auto-format code with `isort
+<https://pycqa.github.io/isort/>`_ and `Black
+<https://black.readthedocs.io/>`_. Many editors and IDEs also support
+auto-formatting with these tools every time you save a file. The CI
+suite will disallow any code that does not follow the isort/Black
+format.
+
+All code must also be compatible with all supported versions of
+Python.
+
+
+Other guidelines
+----------------
+
+* If you need to add a new file of code, please make sure to put a
+  license identifier comment near the top of the file. You can copy
+  and paste the license identifier comment from any existing file,
+  where it looks like this:
+  ``# SPDX-License-Identifier: BSD-3-Clause``
+
+* Documentation and tests are not just recommended -- they're
+  required. Any new file, class, method or function must have a
+  docstring and must either include that docstring (via autodoc) in
+  the built documentation, or must have manually-written documentation
+  in the ``docs/`` directory. Any new feature or bugfix must have
+  sufficient tests to prove that it works, and the test coverage
+  report must come out at 100%. The CI suite will fail if test
+  coverage is below 100%, if there's any code which doesn't have a
+  docstring, or if there are any misspelled words in the documentation
+  (and if there's a word the spell-checker should learn to recognize,
+  add it to ``docs/spelling_wordlist.txt``).
diff --git a/MANIFEST.in b/MANIFEST.in
deleted file mode 100644
index 5c44e81..0000000
--- a/MANIFEST.in
+++ /dev/null
@@ -1,13 +0,0 @@
-include LICENSE
-include MANIFEST.in
-include .editorconfig
-include *.yaml
-include docs/*.rst docs/*.txt docs/*.py docs/*.bat docs/Makefile
-include .flake8
-include pyproject.toml
-include noxfile.py
-include tox.ini
-graft src
-graft tests
-global-exclude *.pyc
-prune docs/_build
diff --git a/docs/changelog.rst b/docs/changelog.rst
index 15facf0..312f38d 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -56,6 +56,13 @@ The API stability/deprecation policy for this library is as follows:
 Releases under CalVer
 ---------------------
 
+Version 24.11.0
+~~~~~~~~~~~~~~~
+
+*Under development*
+
+* Supported Python versions are now 3.9, 3.10, 3.11, 3.12, and 3.13.
+
 Version 24.8.0
 ~~~~~~~~~~~~~~
 
@@ -72,7 +79,7 @@ Version 24.6.0
 
 Released June 2024
 
-* Supported Python versions are now 3.8, 3.9, 3.10, and 3.11.
+* Supported Python versions are now 3.8, 3.9, 3.10, and 3.12.
 
 * Running the unit tests no longer uses a third-party test runner; the
   standard-library ``unittest`` module's runner is used instead.
diff --git a/docs/conf.py b/docs/conf.py
index ddcdbc8..1793287 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -20,10 +20,10 @@
     "sphinx_inline_tabs",
 ]
 templates_path = ["_templates"]
-source_suffix = ".rst"
+source_suffix = {".rst": "restructuredtext"}
 master_doc = "index"
 project = "webcolors"
-copyright = "James Bennett, and contributors"
+copyright = "James Bennett and contributors"
 version = get_version("webcolors")
 release = version
 exclude_trees = ["_build"]
diff --git a/docs/conformance.rst b/docs/conformance.rst
index 9e7db80..3d7256c 100644
--- a/docs/conformance.rst
+++ b/docs/conformance.rst
@@ -161,7 +161,7 @@ To run the normal test suite:
       py -m nox
 
 This will attempt to test against each supported version of Python (for
-``webcolors`` |release|, this is 3.8, 3.9, 3.10, 3.11, and 3.12), skipping any
+``webcolors`` |release|, this is 3.9, 3.10, 3.11, 3.12, and 3.12), skipping any
 which are missing on your machine. To test only against a specific version of
 Python, use the ``--python`` flag and pass the version to test. For example, to
 test on Python 3.10:
diff --git a/docs/faq.rst b/docs/faq.rst
index 3d5cc91..323eccb 100644
--- a/docs/faq.rst
+++ b/docs/faq.rst
@@ -13,8 +13,8 @@ General
 What versions of Python are supported?
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-Version |release| of ``webcolors`` supports and is tested on Python 3.8, 3.9,
-3.10, 3.11, and 3.12.
+Version |release| of ``webcolors`` supports and is tested on Python 3.9,
+3.10, 3.11, 3.12, and 3.13.
 
 
 How am I allowed to use this module?
diff --git a/docs/install.rst b/docs/install.rst
index c363f7f..4482111 100644
--- a/docs/install.rst
+++ b/docs/install.rst
@@ -7,8 +7,6 @@ Installation guide
 Version |release| of ``webcolors`` is officially tested and supported on the
 following versions of Python:
 
-* Python 3.8
-
 * Python 3.9
 
 * Python 3.10
@@ -17,6 +15,8 @@ following versions of Python:
 
 * Python 3.12
 
+* Python 3.13
+
 
 Installing ``webcolors``
 ------------------------
diff --git a/docs/requirements.txt b/docs/requirements.txt
new file mode 100644
index 0000000..220d244
--- /dev/null
+++ b/docs/requirements.txt
@@ -0,0 +1,13 @@
+# These dependencies are not "extras" defined in the pyproject.toml,
+# because they're not something you actually want to install alongside
+# the main package. They're also not "dev dependencies" in the PDM
+# sense of the term, because PDM would constrain them to the oldest
+# Python version the main package supports (3.9), while all our
+# documentation jobs, whether run via nox or via readthedocs, run on
+# Python 3.12.
+furo
+sphinx
+sphinx-copybutton
+sphinx-inline-tabs
+sphinx-notfound-page
+sphinxext-opengraph
diff --git a/noxfile.py b/noxfile.py
index b78dcdd..48eea40 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -38,7 +38,7 @@
 )
 
 
-def clean(paths: typing.Iterable[os.PathLike] = ARTIFACT_PATHS) -> None:
+def clean(paths: typing.Iterable[pathlib.Path] = ARTIFACT_PATHS) -> None:
     """
     Clean up after a test run.
 
@@ -58,13 +58,17 @@ def clean(paths: typing.Iterable[os.PathLike] = ARTIFACT_PATHS) -> None:
 # -----------------------------------------------------------------------------------
 
 
-@nox.session(python=["3.8", "3.9", "3.10", "3.11", "3.12"], tags=["tests"])
+@nox.session(python=["3.9", "3.10", "3.11", "3.12", "3.13"], tags=["tests"])
 def tests_with_coverage(session: nox.Session) -> None:
     """
     Run the package's unit tests, with coverage instrumentation.
 
     """
-    session.install(".[tests]")
+    session.install(
+        ".[tests]",
+        "coverage",
+        'tomli; python_full_version < "3.11.0a7"',
+    )
     session.run(
         f"python{session.python}",
         "-Wonce::DeprecationWarning",
@@ -80,7 +84,7 @@ def tests_with_coverage(session: nox.Session) -> None:
     clean()
 
 
-@nox.session(python=["3.12"], tags=["tests"])
+@nox.session(python=["3.13"], tags=["tests"])
 def coverage_report(session: nox.Session) -> None:
     """
     Combine coverage from the various test runs and output the report.
@@ -100,7 +104,7 @@ def coverage_report(session: nox.Session) -> None:
     session.run(f"python{session.python}", "-Im", "coverage", "erase")
 
 
-@nox.session(python=["3.12"], tags=["tests", "release"])
+@nox.session(python=["3.13"], tags=["release"])
 def tests_definitions(session: nox.Session) -> None:
     """
     Run the full color definitions test suite (requires an internet connection).
@@ -113,7 +117,7 @@ def tests_definitions(session: nox.Session) -> None:
     clean()
 
 
-@nox.session(python=["3.12"], tags=["tests", "release"])
+@nox.session(python=["3.13"], tags=["release"])
 def tests_full_colors(session: nox.Session) -> None:
     """
     Run the full color conversion test suite (slow/CPU-intensive).
@@ -130,24 +134,31 @@ def tests_full_colors(session: nox.Session) -> None:
 # -----------------------------------------------------------------------------------
 
 
+# The documentation jobs ordinarily would want to use the latest Python version, but
+# currently that's 3.13 and Read The Docs doesn't yet support it. So to ensure the
+# documentation jobs are as closely matched to what would happen on RTD, these jobs stay
+# on 3.12 for now.
 @nox.session(python=["3.12"], tags=["docs"])
 def docs_build(session: nox.Session) -> None:
     """
     Build the package's documentation as HTML.
 
     """
-    session.install(".[docs]")
-    session.chdir("docs")
+    session.install(".", "-r", "docs/requirements.txt")
+    build_dir = session.create_tmp()
     session.run(
-        f"python{session.python}",
+        f"{session.bin}/python{session.python}",
         "-Im",
         "sphinx",
-        "-b",
+        "--builder",
         "html",
-        "-d",
-        f"{session.bin}/../tmp/doctrees",
-        ".",
-        f"{session.bin}/../tmp/html",
+        "--write-all",
+        "-c",
+        "docs/",
+        "--doctree-dir",
+        f"{build_dir}/doctrees",
+        "docs/",
+        f"{build_dir}/html",
     )
     clean()
 
@@ -159,10 +170,7 @@ def docs_docstrings(session: nox.Session) -> None:
     methods.
 
     """
-    # interrogate implicitly depends on pkg_resources, which is part of setuptools but
-    # as of Python 3.12, the venv module no longer automatically installed setuptools
-    # into newly-created environments. So we install it manually here.
-    session.install("interrogate", "setuptools")
+    session.install("interrogate")
     session.run(f"python{session.python}", "-Im", "interrogate", "--version")
     session.run(
         f"python{session.python}",
@@ -182,23 +190,21 @@ def docs_spellcheck(session: nox.Session) -> None:
     Spell-check the package's documentation.
 
     """
-    session.install(
-        "pyenchant",
-        "sphinxcontrib-spelling",
-        ".[docs]",
-    )
+    session.install(".", "-r", "docs/requirements.txt")
+    session.install("pyenchant", "sphinxcontrib-spelling")
     build_dir = session.create_tmp()
-    session.chdir("docs")
     session.run(
-        f"python{session.python}",
+        f"{session.bin}/python{session.python}",
         "-Im",
         "sphinx",
         "-W",  # Promote warnings to errors, so that misspelled words fail the build.
-        "-b",
+        "--builder",
         "spelling",
-        "-d",
+        "-c",
+        "docs/",
+        "--doctree-dir",
         f"{build_dir}/doctrees",
-        ".",
+        "docs/",
         f"{build_dir}/html",
         # On Apple Silicon Macs, this environment variable needs to be set so
         # pyenchant can find the "enchant" C library. See
@@ -208,29 +214,6 @@ def docs_spellcheck(session: nox.Session) -> None:
     clean()
 
 
-@nox.session(python=["3.12"], tags=["docs"])
-def docs_test(session: nox.Session) -> None:
-    """
-    Run the code samples in the documentation with doctest, to ensure they are
-    correct.
-
-    """
-    session.install(".[docs]")
-    session.run(
-        f"python{session.python}",
-        "-Im",
-        "sphinx",
-        "-c",
-        "docs/",
-        "-b",
-        "doctest",
-        "-d",
-        "docs/_build/doctrees/html",
-        "docs/",
-        "docs/_build/html",
-    )
-
-
 # Code formatting checks.
 #
 # These checks do *not* reformat code -- that happens in pre-commit hooks -- but will
@@ -238,7 +221,7 @@ def docs_test(session: nox.Session) -> None:
 # -----------------------------------------------------------------------------------
 
 
-@nox.session(python=["3.12"], tags=["formatters"])
+@nox.session(python=["3.13"], tags=["formatters"])
 def format_black(session: nox.Session) -> None:
     """
     Check code formatting with Black.
@@ -260,7 +243,7 @@ def format_black(session: nox.Session) -> None:
     clean()
 
 
-@nox.session(python=["3.12"], tags=["formatters"])
+@nox.session(python=["3.13"], tags=["formatters"])
 def format_isort(session: nox.Session) -> None:
     """
     Check import order with isort.
@@ -286,7 +269,7 @@ def format_isort(session: nox.Session) -> None:
 # -----------------------------------------------------------------------------------
 
 
-@nox.session(python=["3.12"], tags=["linters", "security"])
+@nox.session(python=["3.13"], tags=["linters", "security"])
 def lint_bandit(session: nox.Session) -> None:
     """
     Lint code with the Bandit security analyzer.
@@ -307,7 +290,7 @@ def lint_bandit(session: nox.Session) -> None:
     clean()
 
 
-@nox.session(python=["3.12"], tags=["linters"])
+@nox.session(python=["3.13"], tags=["linters"])
 def lint_flake8(session: nox.Session) -> None:
     """
     Lint code with flake8.
@@ -327,16 +310,13 @@ def lint_flake8(session: nox.Session) -> None:
     clean()
 
 
-@nox.session(python=["3.12"], tags=["linters"])
+@nox.session(python=["3.13"], tags=["linters"])
 def lint_pylint(session: nox.Session) -> None:
     """
     Lint code with Pylint.
 
     """
-    # Pylint requires that all dependencies be importable during the run. This package
-    # does not have any direct dependencies, nor does the normal test suite, but the
-    # full conformance suite does require a few extra libraries, so they're installed
-    # here.
+    # Pylint requires that all dependencies be importable during the run.
     session.install("pylint", "bs4", "html5lib", "requests")
     session.run(f"python{session.python}", "-Im", "pylint", "--version")
     session.run(f"python{session.python}", "-Im", "pylint", "src/", "tests/")
@@ -347,7 +327,7 @@ def lint_pylint(session: nox.Session) -> None:
 # -----------------------------------------------------------------------------------
 
 
-@nox.session(python=["3.12"], tags=["packaging"])
+@nox.session(python=["3.13"], tags=["packaging"])
 def package_build(session: nox.Session) -> None:
     """
     Check that the package builds.
@@ -359,7 +339,7 @@ def package_build(session: nox.Session) -> None:
     clean()
 
 
-@nox.session(python=["3.12"], tags=["packaging"])
+@nox.session(python=["3.13"], tags=["packaging"])
 def package_description(session: nox.Session) -> None:
     """
     Check that the package description will render on the Python Package Index.
@@ -383,7 +363,7 @@ def package_description(session: nox.Session) -> None:
     clean()
 
 
-@nox.session(python=["3.12"], tags=["packaging"])
+@nox.session(python=["3.13"], tags=["packaging"])
 def package_manifest(session: nox.Session) -> None:
     """
     Check that the set of files in the package matches the set under version control.
@@ -397,7 +377,7 @@ def package_manifest(session: nox.Session) -> None:
     clean()
 
 
-@nox.session(python=["3.12"], tags=["packaging"])
+@nox.session(python=["3.13"], tags=["packaging"])
 def package_pyroma(session: nox.Session) -> None:
     """
     Check package quality with pyroma.
@@ -408,7 +388,7 @@ def package_pyroma(session: nox.Session) -> None:
     clean()
 
 
-@nox.session(python=["3.12"], tags=["packaging"])
+@nox.session(python=["3.13"], tags=["packaging"])
 def package_wheel(session: nox.Session) -> None:
     """
     Check the built wheel package for common errors.
diff --git a/pdm.lock b/pdm.lock
new file mode 100644
index 0000000..5607e8d
--- /dev/null
+++ b/pdm.lock
@@ -0,0 +1,141 @@
+# This file is @generated by PDM.
+# It is not intended for manual editing.
+
+[metadata]
+groups = ["default", "tests"]
+strategy = ["inherit_metadata"]
+lock_version = "4.5.0"
+content_hash = "sha256:51fdb4b676102bbac5ee91a02110ebc2da1aa01ae32bbeaae8fbd417bbe25512"
+
+[[metadata.targets]]
+requires_python = ">=3.9,<3.10"
+
+[[metadata.targets]]
+requires_python = ">=3.10"
+
+[[package]]
+name = "argcomplete"
+version = "3.5.1"
+requires_python = ">=3.8"
+summary = "Bash tab completion for argparse"
+groups = ["tests"]
+files = [
+    {file = "argcomplete-3.5.1-py3-none-any.whl", hash = "sha256:1a1d148bdaa3e3b93454900163403df41448a248af01b6e849edc5ac08e6c363"},
+    {file = "argcomplete-3.5.1.tar.gz", hash = "sha256:eb1ee355aa2557bd3d0145de7b06b2a45b0ce461e1e7813f5d066039ab4177b4"},
+]
+
+[[package]]
+name = "colorama"
+version = "0.4.6"
+requires_python = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*,!=3.6.*,>=2.7"
+summary = "Cross-platform colored terminal text."
+groups = ["tests"]
+marker = "sys_platform == \"win32\""
+files = [
+    {file = "colorama-0.4.6-py2.py3-none-any.whl", hash = "sha256:4f1d9991f5acc0ca119f9d443620b77f9d6b33703e51011c16baf57afb285fc6"},
+    {file = "colorama-0.4.6.tar.gz", hash = "sha256:08695f5cb7ed6e0531a20572697297273c47b8cae5a63ffc6d6ed5c201be6e44"},
+]
+
+[[package]]
+name = "colorlog"
+version = "6.9.0"
+requires_python = ">=3.6"
+summary = "Add colours to the output of Python's logging module."
+groups = ["tests"]
+dependencies = [
+    "colorama; sys_platform == \"win32\"",
+]
+files = [
+    {file = "colorlog-6.9.0-py3-none-any.whl", hash = "sha256:5906e71acd67cb07a71e779c47c4bcb45fb8c2993eebe9e5adcd6a6f1b283eff"},
+    {file = "colorlog-6.9.0.tar.gz", hash = "sha256:bfba54a1b93b94f54e1f4fe48395725a3d92fd2a4af702f6bd70946bdc0c6ac2"},
+]
+
+[[package]]
+name = "distlib"
+version = "0.3.9"
+summary = "Distribution utilities"
+groups = ["tests"]
+files = [
+    {file = "distlib-0.3.9-py2.py3-none-any.whl", hash = "sha256:47f8c22fd27c27e25a65601af709b38e4f0a45ea4fc2e710f65755fa8caaaf87"},
+    {file = "distlib-0.3.9.tar.gz", hash = "sha256:a60f20dea646b8a33f3e7772f74dc0b2d0772d2837ee1342a00645c81edf9403"},
+]
+
+[[package]]
+name = "filelock"
+version = "3.16.1"
+requires_python = ">=3.8"
+summary = "A platform independent file lock."
+groups = ["tests"]
+files = [
+    {file = "filelock-3.16.1-py3-none-any.whl", hash = "sha256:2082e5703d51fbf98ea75855d9d5527e33d8ff23099bec374a134febee6946b0"},
+    {file = "filelock-3.16.1.tar.gz", hash = "sha256:c249fbfcd5db47e5e2d6d62198e565475ee65e4831e2561c8e313fa7eb961435"},
+]
+
+[[package]]
+name = "nox"
+version = "2024.10.9"
+requires_python = ">=3.8"
+summary = "Flexible test automation."
+groups = ["tests"]
+dependencies = [
+    "argcomplete<4,>=1.9.4",
+    "colorlog<7,>=2.6.1",
+    "packaging>=20.9",
+    "tomli>=1; python_version < \"3.11\"",
+    "virtualenv>=20.14.1",
+]
+files = [
+    {file = "nox-2024.10.9-py3-none-any.whl", hash = "sha256:1d36f309a0a2a853e9bccb76bbef6bb118ba92fa92674d15604ca99adeb29eab"},
+    {file = "nox-2024.10.9.tar.gz", hash = "sha256:7aa9dc8d1c27e9f45ab046ffd1c3b2c4f7c91755304769df231308849ebded95"},
+]
+
+[[package]]
+name = "packaging"
+version = "24.2"
+requires_python = ">=3.8"
+summary = "Core utilities for Python packages"
+groups = ["tests"]
+files = [
+    {file = "packaging-24.2-py3-none-any.whl", hash = "sha256:09abb1bccd265c01f4a3aa3f7a7db064b36514d2cba19a2f694fe6150451a759"},
+    {file = "packaging-24.2.tar.gz", hash = "sha256:c228a6dc5e932d346bc5739379109d49e8853dd8223571c7c5b55260edc0b97f"},
+]
+
+[[package]]
+name = "platformdirs"
+version = "4.3.6"
+requires_python = ">=3.8"
+summary = "A small Python package for determining appropriate platform-specific dirs, e.g. a `user data dir`."
+groups = ["tests"]
+files = [
+    {file = "platformdirs-4.3.6-py3-none-any.whl", hash = "sha256:73e575e1408ab8103900836b97580d5307456908a03e92031bab39e4554cc3fb"},
+    {file = "platformdirs-4.3.6.tar.gz", hash = "sha256:357fb2acbc885b0419afd3ce3ed34564c13c9b95c89360cd9563f73aa5e2b907"},
+]
+
+[[package]]
+name = "tomli"
+version = "2.0.2"
+requires_python = ">=3.8"
+summary = "A lil' TOML parser"
+groups = ["tests"]
+marker = "python_version < \"3.11\" and python_version >= \"3.9\""
+files = [
+    {file = "tomli-2.0.2-py3-none-any.whl", hash = "sha256:2ebe24485c53d303f690b0ec092806a085f07af5a5aa1464f3931eec36caaa38"},
+    {file = "tomli-2.0.2.tar.gz", hash = "sha256:d46d457a85337051c36524bc5349dd91b1877838e2979ac5ced3e710ed8a60ed"},
+]
+
+[[package]]
+name = "virtualenv"
+version = "20.27.1"
+requires_python = ">=3.8"
+summary = "Virtual Python Environment builder"
+groups = ["tests"]
+dependencies = [
+    "distlib<1,>=0.3.7",
+    "filelock<4,>=3.12.2",
+    "importlib-metadata>=6.6; python_version < \"3.8\"",
+    "platformdirs<5,>=3.9.1",
+]
+files = [
+    {file = "virtualenv-20.27.1-py3-none-any.whl", hash = "sha256:f11f1b8a29525562925f745563bfd48b189450f61fb34c4f9cc79dd5aa32a1f4"},
+    {file = "virtualenv-20.27.1.tar.gz", hash = "sha256:142c6be10212543b32c6c45d3d3893dff89112cc588b7d0879ae5a1ec03a47ba"},
+]
diff --git a/pyproject.toml b/pyproject.toml
index 2bc5416..791ca4d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,10 +1,10 @@
 [build-system]
-requires = ["setuptools>=61.0"]
-build-backend = "setuptools.build_meta"
+requires = ["pdm-backend"]
+build-backend = "pdm.backend"
 
 [project]
 authors = [
-  {name = "James Bennett", email = "james@b-list.org"}
+  {name = "James Bennett"}
 ]
 classifiers = [
   "Development Status :: 5 - Production/Stable",
@@ -14,43 +14,33 @@ classifiers = [
   "Operating System :: OS Independent",
   "Programming Language :: Python",
   "Programming Language :: Python :: 3",
-  "Programming Language :: Python :: 3.8",
   "Programming Language :: Python :: 3.9",
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",
   "Programming Language :: Python :: 3.12",
+  "Programming Language :: Python :: 3.13",
   "Topic :: Utilities",
 ]
 name = "webcolors"
 description = "A library for working with the color formats defined by HTML and CSS."
-dynamic = ["version"]
 keywords = ["color", "css", "html", "web"]
 license = {text = "BSD-3-Clause"}
 readme = "README.rst"
-requires-python = ">=3.8"
+requires-python = ">=3.9"
+version = "24.11.0a1"
 
 [project.urls]
-documentation = "https://webcolors.readthedocs.io"
-homepage = "https://github.com/ubernostrum/webcolors"
+"Documentation" = "https://webcolors.readthedocs.io"
+"Source Code" = "https://github.com/ubernostrum/webcolors"
 
-[project.optional-dependencies]
-docs = [
-  "furo",
-  "sphinx",
-  "sphinx-copybutton",
-  "sphinx-inline-tabs",
-  "sphinx-notfound-page",
-  "sphinxext-opengraph",
-]
-tests = [
-  "coverage[toml]",
-]
+[dependency-groups]
+tests = ["nox"]
 
 [tool.bandit]
 skips = ["B101"]
 
 [tool.black]
-target-version = ["py38", "py39", "py310", "py311", "py312"]
+target-version = ["py39", "py310", "py311", "py312", "py313"]
 
 [tool.coverage.paths]
 source = ["src", ".nox/tests_with_coverage*/**/site-packages"]
@@ -64,10 +54,33 @@ parallel = true
 source = ["webcolors"]
 
 [tool.interrogate]
+fail-under = 100
+ignore-init-method = true
 ignore-init-module = true
 
 [tool.isort]
 profile = "black"
 
-[tool.setuptools.dynamic]
-version = {attr = "webcolors.__version__"}
+[tool.pdm]
+distribution = true
+
+[tool.pdm.build]
+source-includes = [
+    ".editorconfig",
+    ".flake8",
+    ".pre-commit-config.yaml",
+    ".readthedocs.yaml",
+    "AUTHORS",
+    "CONTRIBUTING.rst",
+    "docs/",
+    "noxfile.py",
+    "pdm.lock",
+    "runtests.py",
+    "tests/",
+]
+
+[tool.pylint]
+disable = [
+  "duplicate-code",
+  "protected-access",
+]