diff --git a/pyproject.toml b/pyproject.toml
index 46a745e..68ab7b0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,5 +1,107 @@
+[project]
+name = "stsci.tools"
+description = "Collection of STScI utility functions"
+requires-python = ">=3.8"
+authors = [
+    { name = "STScI", email = "help@stsci.edu" },
+]
+keywords = [
+    "astronomy",
+    "astrophysics",
+    "utility",
+]
+classifiers = [
+    "Intended Audience :: Science/Research",
+    "License :: OSI Approved :: BSD License",
+    "Operating System :: OS Independent",
+    "Programming Language :: Python",
+    "Programming Language :: Python :: Implementation :: CPython",
+    "Topic :: Scientific/Engineering :: Astronomy",
+    "Topic :: Software Development :: Libraries :: Python Modules",
+]
+dependencies = [
+    "packaging",
+    "numpy",
+    "astropy>=5.0.4",
+]
+dynamic = [
+    "version",
+]
+
+[project.readme]
+file = "README.md"
+content-type = "text/markdown"
+
+[project.license]
+file = "LICENSE.md"
+content-type = "text/plain"
+
+[project.urls]
+Homepage = "https://www.github.com/spacetelescope/stsci.tools"
+
+[project.scripts]
+convertwaiveredfits = "stsci.tools.convertwaiveredfits:main"
+convertlog = "stsci.tools.convertlog:main"
+
+[project.optional-dependencies]
+test = [
+    "pytest",
+    "pytest-astropy-header",
+    "pytest-doctestplus",
+]
+docs = [
+    "sphinx",
+    "numpydoc",
+    "sphinx_rtd_theme",
+]
+
 [build-system]
-requires = ["setuptools>=30.3.0",
-            "setuptools_scm",
-            "wheel"]
+requires = [
+    "setuptools>=30.3.0",
+    "setuptools_scm",
+    "wheel",
+]
 build-backend = "setuptools.build_meta"
+
+[tool.setuptools]
+zip-safe = false
+include-package-data = false
+license-files = [
+    "LICENSE.md",
+]
+
+[tool.setuptools.packages.find]
+where = [
+    "lib/",
+]
+
+[tool.setuptools.package-data]
+"stsci.tools.tests" = [
+    "data/*.*",
+]
+
+[tool.setuptools_scm]
+version_file = "lib/stsci/tools/version.py"
+
+[tool.pytest.ini_options]
+minversion = "6"
+testpaths = [
+    "lib/stsci/tools",
+]
+addopts = "--doctest-modules"
+astropy_header = true
+xfail_strict = true
+filterwarnings = [
+    "error",
+    "ignore:.*Column disp option",
+    "ignore:NMPFIT is deprecated",
+    "ignore:GFIT is deprecated",
+    "ignore:unclosed file:ResourceWarning",
+]
+
+[tool.ruff.lint]
+extend-ignore = [
+    "E501",
+    "W504",
+]
+
diff --git a/setup.cfg b/setup.cfg
deleted file mode 100644
index c590588..0000000
--- a/setup.cfg
+++ /dev/null
@@ -1,76 +0,0 @@
-[metadata]
-name = stsci.tools
-description = Collection of STScI utility functions
-long_description = Collection of STScI utility functions
-long_description_content_type = text/plain
-keywords = astronomy, astrophysics, utility
-author = STScI
-author_email = help@stsci.edu
-license = BSD
-license_file = LICENSE.md
-url = https://www.github.com/spacetelescope/stsci.tools
-classifiers =
-    Intended Audience :: Science/Research
-    License :: OSI Approved :: BSD License
-    Operating System :: OS Independent
-    Programming Language :: Python
-    Programming Language :: Python :: Implementation :: CPython
-    Topic :: Scientific/Engineering :: Astronomy
-    Topic :: Software Development :: Libraries :: Python Modules
-
-[options]
-packages = find:
-package_dir =
-    = lib
-zip_safe = False
-setup_requires =
-    setuptools_scm
-install_requires =
-    packaging
-    numpy
-    astropy>=5.0.4
-python_requires = >=3.8
-
-[options.packages.find]
-where = lib
-
-[options.extras_require]
-test =
-    pytest
-    pytest-astropy-header
-    pytest-doctestplus
-docs =
-    sphinx
-    numpydoc
-    sphinx_rtd_theme
-
-[options.package_data]
-stsci.tools.tests = data/*.*
-
-[options.entry_points]
-console_scripts =
-    convertwaiveredfits = stsci.tools.convertwaiveredfits:main
-    convertlog = stsci.tools.convertlog:main
-
-[tool:pytest]
-minversion = 6
-testpaths = lib/stsci/tools
-addopts = --doctest-modules
-astropy_header = true
-xfail_strict = true
-filterwarnings =
-    error
-    ignore:.*Column disp option
-    ignore:NMPFIT is deprecated
-    ignore:GFIT is deprecated
-    ignore:unclosed file:ResourceWarning
-
-[flake8]
-# E501: line too long
-# W504: line break after binary operator
-ignore = E501,W504
-
-[bdist_wheel]
-# If at all possible, it is good practice to do this. If you cannot, you
-# will need to generate wheels for each Python version that you support.
-universal=1
diff --git a/setup.py b/setup.py
deleted file mode 100755
index 3313702..0000000
--- a/setup.py
+++ /dev/null
@@ -1,32 +0,0 @@
-#!/usr/bin/env python
-
-import sys
-from setuptools import setup
-
-TEST_HELP = """
-Note: running tests is no longer done using 'python setup.py test'. Instead
-you will need to run:
-    pip install -e .
-    pytest
-For more information, see:
-  https://docs.astropy.org/en/latest/development/testguide.html#running-tests
-"""
-
-if 'test' in sys.argv:
-    print(TEST_HELP)
-    sys.exit(1)
-
-DOCS_HELP = """
-Note: building the documentation is no longer done using
-'python setup.py build_docs'. Instead you will need to run:
-    cd docs
-    make html
-For more information, see:
-  https://docs.astropy.org/en/latest/install.html#builddocs
-"""
-
-if 'build_docs' in sys.argv or 'build_sphinx' in sys.argv:
-    print(DOCS_HELP)
-    sys.exit(1)
-
-setup(use_scm_version={'write_to': 'lib/stsci/tools/version.py'})