diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..2a04a8b
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,40 @@
+[build-system]
+requires = ["flit_core >=3.2,<4"]
+build-backend = "flit_core.buildapi"
+
+[project]
+name = "idna"
+description = "Internationalized Domain Names in Applications (IDNA)"
+readme = "README.rst"
+authors = [
+  {name = "Kim Davies", email = "kim@cynosure.com.au"}
+]
+classifiers = [
+  "Development Status :: 5 - Production/Stable",
+  "Intended Audience :: Developers",
+  "Intended Audience :: System Administrators",
+  "License :: OSI Approved :: BSD License",
+  "Operating System :: OS Independent",
+  "Programming Language :: Python",
+  "Programming Language :: Python :: 3",
+  "Programming Language :: Python :: 3 :: Only",
+  "Programming Language :: Python :: 3.5",
+  "Programming Language :: Python :: 3.6",
+  "Programming Language :: Python :: 3.7",
+  "Programming Language :: Python :: 3.8",
+  "Programming Language :: Python :: 3.9",
+  "Programming Language :: Python :: 3.10",
+  "Programming Language :: Python :: 3.11",
+  "Programming Language :: Python :: Implementation :: CPython",
+  "Programming Language :: Python :: Implementation :: PyPy",
+  "Topic :: Internet :: Name Service (DNS)",
+  "Topic :: Software Development :: Libraries :: Python Modules",
+  "Topic :: Utilities",
+]
+requires-python = ">=3.5"
+dynamic = ["version"]
+
+[project.urls]
+"Source" = "https://github.com/kjd/idna"
+"Changelog" = "https://github.com/kjd/idna/blob/master/HISTORY.rst"
+"Issue tracker" = "https://github.com/kjd/idna/issues"
diff --git a/setup.py b/setup.py
deleted file mode 100644
index dffa23d..0000000
--- a/setup.py
+++ /dev/null
@@ -1,62 +0,0 @@
-"""
-A library to support the Internationalised Domain Names in Applications
-(IDNA) protocol as specified in RFC 5890 et.al. This new methodology,
-known as IDNA 2008, can generate materially different results to the
-previous standard. The library can act as a drop-in replacement for
-the "encodings.idna" module.
-"""
-
-import io, sys
-from setuptools import setup
-
-
-def main():
-
-    python_version = sys.version_info[:2]
-    if python_version < (3,4):
-        raise SystemExit("Sorry, Python 3.4 or newer required")
-
-    package_data = {}
-    exec(open('idna/package_data.py').read(), package_data)
-
-    arguments = {
-        'name': 'idna',
-        'packages': ['idna'],
-        'package_data': {'idna': ['py.typed']},
-        'include_package_data': True,
-        'version': package_data['__version__'],
-        'description': 'Internationalized Domain Names in Applications (IDNA)',
-        'long_description': open("README.rst", encoding="UTF-8").read(),
-        'author': 'Kim Davies',
-        'author_email': 'kim@cynosure.com.au',
-        'license': 'BSD-3-Clause',
-        'url': 'https://github.com/kjd/idna',
-        'classifiers': [
-            'Development Status :: 5 - Production/Stable',
-            'Intended Audience :: Developers',
-            'Intended Audience :: System Administrators',
-            'License :: OSI Approved :: BSD License',
-            'Operating System :: OS Independent',
-            'Programming Language :: Python',
-            'Programming Language :: Python :: 3',
-            'Programming Language :: Python :: 3 :: Only',
-            'Programming Language :: Python :: 3.5',
-            'Programming Language :: Python :: 3.6',
-            'Programming Language :: Python :: 3.7',
-            'Programming Language :: Python :: 3.8',
-            'Programming Language :: Python :: 3.9',
-            'Programming Language :: Python :: 3.10',
-            'Programming Language :: Python :: Implementation :: CPython',
-            'Programming Language :: Python :: Implementation :: PyPy',
-            'Topic :: Internet :: Name Service (DNS)',
-            'Topic :: Software Development :: Libraries :: Python Modules',
-            'Topic :: Utilities',
-        ],
-        'python_requires': '>=3.5',
-        'test_suite': 'tests',
-    }
-
-    setup(**arguments)
-
-if __name__ == '__main__':
-    main()