diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 97ae8fc..f0d68b0 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -28,10 +28,14 @@ jobs:
       - name: Run the Test Suite
         run: |-
           set -x
-          pip install -U setuptools  # for Python >=3.12
-          pip install pytest
-          python setup.py sdist
+          python -m pip install build pytest
+          python -m build
           cd dist/
           tar xf hsluv-*.tar.gz
           cd hsluv-*/
+          python -m pip install .
           pytest -v tests/
+          cd ..
+          python -m pip install --force-reinstall hsluv-*.whl
+          python -c 'import hsluv; from importlib.metadata import version; assert hsluv.__version__ == version("hsluv")'
+          python -m unittest discover -s hsluv-*/tests -v
diff --git a/README.md b/README.md
index 96ac227..720b5bc 100644
--- a/README.md
+++ b/README.md
@@ -37,10 +37,9 @@ For HPLuv (the pastel variant), use `hpluv_to_hex`, `hpluv_to_rgb`, `hex_to_hplu
 
 ## Testing
 
-Run `python setup.py test`.
+Run `python -m unittest discover -v`.
 
 ## Authors
 
 * Robert McGinley ([mcginleyr1](https://github.com/mcginleyr1))
 * Alexei Boronine ([boronine](https://github.com/boronine))
-
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..0a46900
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,38 @@
+[build-system]
+requires = ["setuptools>=77.0.3"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "hsluv"
+dynamic = ["version"]
+description = "Human-friendly HSL"
+readme = "README.md"
+license = "MIT"
+license-files = ["LICENSE.txt"]
+authors = [{email = "alexei@boronine.com"}]
+requires-python = ">=3.11"
+keywords = ["color", "hsl", "cie", "cieluv", "colorwheel", "hsluv", "hpluv"]
+classifiers = [
+    "Development Status :: 5 - Production/Stable",
+    "Intended Audience :: Developers",
+    "Operating System :: OS Independent",
+    "Topic :: Software Development",
+    "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
+    "Programming Language :: Python :: 3.14",
+    "Programming Language :: Python :: 3.15",
+    "Programming Language :: Python :: 3 :: Only",
+]
+
+[project.urls]
+Homepage = "https://www.hsluv.org"
+"Bug Tracker" = "https://github.com/hsluv/hsluv-python/issues"
+"Source Code" = "https://github.com/hsluv/hsluv-python"
+
+[tool.setuptools]
+py-modules = ["hsluv"]
+
+[tool.setuptools.dynamic]
+version = {attr = "hsluv.__version__"}
diff --git a/setup.cfg b/setup.cfg
deleted file mode 100644
index 2a9acf1..0000000
--- a/setup.cfg
+++ /dev/null
@@ -1,2 +0,0 @@
-[bdist_wheel]
-universal = 1
diff --git a/setup.py b/setup.py
deleted file mode 100644
index 9edb8d5..0000000
--- a/setup.py
+++ /dev/null
@@ -1,40 +0,0 @@
-#! /usr/bin/env python3
-from setuptools import setup
-
-from hsluv import __version__
-
-setup(
-    name='hsluv',
-    version=__version__,
-    description='Human-friendly HSL',
-    long_description=open('README.md').read(),
-    long_description_content_type='text/markdown',
-    license="MIT",
-    author_email="alexei@boronine.com",
-    url="https://www.hsluv.org",
-    keywords="color hsl cie cieluv colorwheel hsluv hpluv",
-    classifiers=[
-        "Development Status :: 5 - Production/Stable",
-        "Intended Audience :: Developers",
-        "License :: OSI Approved :: MIT License",
-        "Operating System :: OS Independent",
-        "Topic :: Software Development",
-        "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.11",
-        "Programming Language :: Python :: 3.12",
-        "Programming Language :: Python :: 3.13",
-        "Programming Language :: Python :: 3.14",
-        "Programming Language :: Python :: 3.15",
-        "Programming Language :: Python :: 3 :: Only",
-    ],
-    python_requires='>=3.11',
-    setup_requires=[
-        'setuptools>=38.6.0',  # for long_description_content_type
-    ],
-    py_modules=["hsluv"],
-    test_suite="tests.test_hsluv",
-    project_urls={
-        "Bug Tracker": "https://github.com/hsluv/hsluv-python/issues",
-        "Source Code": "https://github.com/hsluv/hsluv-python",
-    }
-)