diff --git a/.flake8 b/.flake8
new file mode 100644
index 0000000..bfdb913
--- /dev/null
+++ b/.flake8
@@ -0,0 +1,7 @@
+# flake8 does not support pyproject.toml (https://github.com/PyCQA/flake8/issues/234)
+
+[flake8]
+# E265: block comment should start with '#'
+# F821 undefined name
+extend-ignore = E265,F821,F841
+extend-exclude = setup.py,__init__.py
\ No newline at end of file
diff --git a/pyproject.toml b/pyproject.toml
index d765267..8584cdc 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,8 +1,77 @@
+[project]
+name = "calcos"
+description = "Calibration software for COS (Cosmic Origins Spectrograph)"
+requires-python = ">=3.8"
+authors = [
+    { name = "Phil Hodge" },
+    { name = "Robert Jedrzejewski" },
+]
+classifiers = [
+    "Intended Audience :: Science/Research",
+    "License :: OSI Approved :: BSD License",
+    "Operating System :: OS Independent",
+    "Programming Language :: Python :: 3",
+    "Programming Language :: C",
+    "Topic :: Software Development :: Libraries :: Python Modules",
+]
+dependencies = [
+    "astropy>=5.0.4",
+    "numpy",
+    "scipy",
+    "stsci.tools>=4.0.0",
+]
+dynamic = [
+    "version",
+]
+
+[project.readme]
+file = "README.md"
+content-type = "text/markdown"
+
+[project.scripts]
+calcos = "calcos:main"
+
+[project.optional-dependencies]
+docs = [
+    "sphinx",
+]
+test = [
+    "ci-watson",
+    "pytest",
+    "pytest-cov",
+    "codecov",
+]
+
 [build-system]
 requires = [
-    "setuptools>=42.0",
+    "setuptools>=61.2",
     "setuptools_scm[toml]>=3.4",
     "wheel",
     "oldest-supported-numpy",
 ]
-build-backend = 'setuptools.build_meta'
+build-backend = "setuptools.build_meta"
+
+[tool.setuptools]
+include-package-data = false
+
+[tool.setuptools.packages.find]
+namespaces = false
+
+[tool.setuptools.package-data]
+calcos = [
+    "pars/*",
+    "*.help",
+]
+
+[tool.setuptools_scm]
+write_to = 'calcos/version.py'
+
+[tool.pytest.ini_options]
+minversion = "3.0"
+norecursedirs = [
+    "build",
+    "doc/build",
+    "src",
+]
+junit_family = "xunit2"
+
diff --git a/setup.cfg b/setup.cfg
deleted file mode 100644
index dc901d7..0000000
--- a/setup.cfg
+++ /dev/null
@@ -1,13 +0,0 @@
-[options]
-python_requires = >=3.8
-
-[tool:pytest]
-minversion = 3.0
-norecursedirs = build doc/build src
-junit_family = xunit2
-
-[flake8]
-# E265: block comment should start with '#'
-# F821 undefined name
-ignore = E265,F821,F841
-exclude = setup.py,__init__.py
diff --git a/setup.py b/setup.py
index 345d5b3..2a1cc00 100755
--- a/setup.py
+++ b/setup.py
@@ -2,8 +2,10 @@
 
 import os
 from fnmatch import fnmatch
-from setuptools import setup, find_packages, Extension
+
 from numpy import get_include as numpy_includes
+from setuptools import setup, Extension
+
 
 def c_sources(parent):
     sources = []
@@ -30,35 +32,7 @@ def c_includes(parent, depth=1):
 SOURCES = c_sources('src')
 INCLUDES = c_includes('src') + [numpy_includes()]
 
-
 setup(
-    name=PACKAGENAME,
-    use_scm_version={'write_to': 'calcos/version.py'},
-    setup_requires=['setuptools_scm'],
-    install_requires=[
-        'astropy>=5.0.4',
-        'numpy',
-        'scipy',
-        'stsci.tools>=4.0.0',
-    ],
-    extras_require={
-        'docs': [
-            'sphinx',
-        ],
-        'test': [
-            'ci-watson',
-            'pytest',
-            'pytest-cov',
-            'codecov',
-        ],
-    },
-    packages=find_packages(),
-    package_data={
-        PACKAGENAME: [
-            'pars/*',
-            '*.help',
-        ],
-    },
     ext_modules=[
         Extension(
             PACKAGENAME + '.ccos',
@@ -66,24 +40,4 @@ def c_includes(parent, depth=1):
             include_dirs=INCLUDES,
         ),
     ],
-    entry_points={
-        'console_scripts': {
-            'calcos = calcos:main',
-        },
-    },
-    author='Phil Hodge, Robert Jedrzejewski',
-    author_email='help@stsci.edu',
-    description='Calibration software for COS (Cosmic Origins Spectrograph)',
-    long_description='README.md',
-    long_description_content_type='text/x-rst',
-    url='https://github.com/spacetelescope/calcos',
-    license='BSD',
-    classifiers=[
-        'Intended Audience :: Science/Research',
-        'License :: OSI Approved :: BSD License',
-        'Operating System :: OS Independent',
-        'Programming Language :: Python :: 3',
-        'Programming Language :: C',
-        'Topic :: Software Development :: Libraries :: Python Modules',
-    ],
 )