diff --git a/CHANGES.rst b/CHANGES.rst
index 86d94a8..0b274bc 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -5,7 +5,7 @@
 6.2 (unreleased)
 ================
 
-- Nothing changed yet.
+- Move all supported package metadata into ``pyproject.toml``.
 
 
 6.1 (2025-10-29)
diff --git a/pyproject.toml b/pyproject.toml
index 15302bf..30adcfb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -9,6 +9,46 @@ requires = [
 ]
 build-backend = "setuptools.build_meta"
 
+[project]
+name = "ExtensionClass"
+version = "6.2.dev0"
+description = "Metaclass for subclassable extension types"
+readme = "README.rst"
+requires-python = ">=3.10"
+license = "ZPL-2.1"
+authors = [
+  { name = "Zope Foundation and contributors", email = "zope-dev@zope.dev" },
+]
+maintainers = [
+  { name = "Plone Foundation and contributors", email = "zope-dev@zope.dev" },
+]
+classifiers = [
+  "Development Status :: 6 - Mature",
+  "Environment :: Web Environment",
+  "Framework :: Zope",
+  "Framework :: Zope :: 5",
+  "Operating System :: OS Independent",
+  "Programming Language :: Python",
+  "Programming Language :: Python :: 3",
+  "Programming Language :: Python :: 3 :: Only",
+  "Programming Language :: Python :: 3.10",
+  "Programming Language :: Python :: 3.11",
+  "Programming Language :: Python :: 3.12",
+  "Programming Language :: Python :: 3.13",
+  "Programming Language :: Python :: 3.14",
+  "Programming Language :: Python :: Implementation :: CPython",
+  "Programming Language :: Python :: Implementation :: PyPy",
+]
+dependencies = []
+
+[project.optional-dependencies]
+test = ["zope.testrunner"]
+
+[project.urls]
+Issues = "https://github.com/zopefoundation/ExtensionClass/issues"
+Source = "https://github.com/zopefoundation/ExtensionClass"
+Changelog = "https://github.com/zopefoundation/ExtensionClass/blob/master/CHANGES.rst"
+
 [tool.coverage.run]
 branch = true
 source = ["ExtensionClass"]
diff --git a/setup.py b/setup.py
index a17ca91..f2357f8 100644
--- a/setup.py
+++ b/setup.py
@@ -17,21 +17,11 @@
 import platform
 
 from setuptools import Extension
-from setuptools import find_packages
 from setuptools import setup
 
 
-with open('README.rst') as f:
-    README = f.read()
-
-with open('CHANGES.rst') as f:
-    CHANGES = f.read()
-
 # PyPy won't build the extension.
-py_impl = platform.python_implementation
-is_pypy = py_impl() == 'PyPy'
-
-if is_pypy:
+if platform.python_implementation() == 'PyPy':
     ext_modules = []
 else:
     ext_modules = [
@@ -49,42 +39,5 @@
                   include_dirs=['src']),
     ]
 
-version = '6.2.dev0'
-
-setup(
-    name='ExtensionClass',
-    version=version,
-    url='https://github.com/zopefoundation/ExtensionClass',
-    license='ZPL-2.1',
-    description='Metaclass for subclassable extension types',
-    author='Zope Foundation and Contributors',
-    author_email='zope-dev@zope.dev',
-    long_description='\n\n'.join([README, CHANGES]),
-    packages=find_packages('src'),
-    package_dir={'': 'src'},
-    classifiers=[
-        "Development Status :: 6 - Mature",
-        "Environment :: Web Environment",
-        "Framework :: Zope :: 5",
-        "License :: OSI Approved :: Zope Public License",
-        "Operating System :: OS Independent",
-        "Programming Language :: Python",
-        "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.10",
-        "Programming Language :: Python :: 3.11",
-        "Programming Language :: Python :: 3.12",
-        "Programming Language :: Python :: 3.13",
-        "Programming Language :: Python :: 3.14",
-        "Programming Language :: Python :: Implementation :: CPython",
-        "Programming Language :: Python :: Implementation :: PyPy",
-    ],
-    ext_modules=ext_modules,
-    include_package_data=True,
-    zip_safe=False,
-    extras_require={
-        'test': [
-            'zope.testrunner',
-        ],
-    },
-    python_requires='>=3.10',
-)
+# See pyproject.toml for package metadata
+setup(ext_modules=ext_modules)