diff --git a/MANIFEST.in b/MANIFEST.in
deleted file mode 100644
index 86c7026..0000000
--- a/MANIFEST.in
+++ /dev/null
@@ -1 +0,0 @@
-include COPYING README.md
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..7a1c0e3
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,52 @@
+[build-system]
+requires = ["setuptools>=61.2", "wheel", "setuptools_scm[toml]>=3.4.3"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "exrex"
+authors = [{name = "Adam Tauber", email = "asciimoo@gmail.com"}]
+license = {text = "AGPL-3.0-or-later"}
+description = "Irregular methods for regular expressions"
+readme = "README.md"
+keywords = [
+    "regexp",
+    "generators",
+    "string",
+    "generation",
+    "regex",
+    "simplification",
+]
+classifiers = [
+    "Development Status :: 4 - Beta",
+    "Topic :: Utilities",
+    "Environment :: Console",
+    "License :: OSI Approved :: GNU Affero General Public License v3",
+    "Programming Language :: Python",
+    "Programming Language :: Python :: 2",
+    "Programming Language :: Python :: 2.6",
+    "Programming Language :: Python :: 2.7",
+    "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3.3",
+    "Programming Language :: Python :: 3.4",
+    "Programming Language :: Python :: 3.5",
+]
+dependencies = []
+dynamic = ["version"]
+
+[project.urls]
+Homepage = "https://github.com/asciimoo/exrex"
+Download = "https://github.com/asciimoo/exrex/tarball/master"
+
+[project.scripts]
+exrex = "exrex:__main__"
+
+[tool.setuptools]
+package-dir = {"" = "src"}
+py-modules = ["exrex"]
+include-package-data = true
+
+[tool.setuptools.packages.find]
+exclude = ["tests"]
+namespaces = false
+
+[tool.setuptools_scm]
diff --git a/setup.py b/setup.py
deleted file mode 100644
index 475a86f..0000000
--- a/setup.py
+++ /dev/null
@@ -1,126 +0,0 @@
-# -*- coding: utf-8 -*-
-import io
-import os
-import sys
-from shutil import rmtree
-
-from setuptools import find_packages, setup, Command
-
-# Package meta-data.
-NAME = 'exrex'
-DESCRIPTION = 'Irregular methods for regular expressions'
-URL = 'https://github.com/asciimoo/exrex'
-EMAIL = 'asciimoo@gmail.com'
-AUTHOR = 'Adam Tauber'
-VERSION = '0.10.6'
-
-# What packages are required for this module to be executed?
-REQUIRED = [
-    # nothing in-here
-]
-
-# What packages are optional?
-EXTRAS = {
-    # nothing in-here
-}
-
-# ------------------------------------------------
-
-here = os.path.abspath(os.path.dirname(__file__))
-
-# Import the README and use it as the long-description.
-# Note: this will only work if 'README.md' is present in your MANIFEST.in file!
-try:
-    with io.open(os.path.join(here, 'README.md'), encoding='utf-8') as f:
-        long_description = '\n' + f.read()
-except FileNotFoundError:
-    long_description = DESCRIPTION
-
-# Load the package's __version__.py module as a dictionary.
-about = {}
-if not VERSION:
-    with open(os.path.join(here, NAME, '__version__.py')) as f:
-        exec(f.read(), about)
-else:
-    about['__version__'] = VERSION
-
-
-class UploadCommand(Command):
-    """Support setup.py upload."""
-
-    description = 'Build and publish the package.'
-    user_options = []
-
-    @staticmethod
-    def status(s):
-        """Prints things in bold."""
-        print('\033[1m{0}\033[0m'.format(s))
-
-    def initialize_options(self):
-        pass
-
-    def finalize_options(self):
-        pass
-
-    def run(self):
-        try:
-            self.status('Removing previous builds…')
-            rmtree(os.path.join(here, 'dist'))
-        except OSError:
-            pass
-
-        self.status('Building Source and Wheel (universal) distribution…')
-        os.system('{0} setup.py sdist bdist_wheel --universal'.format(sys.executable))
-
-        self.status('Uploading the package to PyPI via Twine…')
-        os.system('twine upload dist/*')
-
-        self.status('Pushing git tags…')
-        os.system('git tag v{0}'.format(about['__version__']))
-        os.system('git push --tags')
-        
-        sys.exit()
-
-
-# Setup:
-setup(
-    name=NAME,
-    version=about['__version__'],
-    description=DESCRIPTION,
-    long_description=long_description,
-    long_description_content_type='text/markdown',
-    author=AUTHOR,
-    author_email=EMAIL,
-    url=URL,
-    keywords="regexp generators string generation regex simplification",
-    scripts=['exrex.py'],
-    py_modules=['exrex'],
-    packages=find_packages(exclude=('tests',)),
-    install_requires=REQUIRED,
-    extras_require=EXTRAS,
-    include_package_data=True,
-    license='AGPLv3+',
-    download_url='https://github.com/asciimoo/exrex/tarball/master',
-    entry_points={
-        "console_scripts": ["exrex=exrex:__main__"]
-    },
-    classifiers=[
-        # As from http://pypi.python.org/pypi?%3Aaction=list_classifiers
-        "Development Status :: 4 - Beta",
-        "Topic :: Utilities",
-        'Environment :: Console',
-        'License :: OSI Approved :: GNU Affero General Public License v3',
-        'Programming Language :: Python',
-        'Programming Language :: Python :: 2',
-        'Programming Language :: Python :: 2.6',
-        'Programming Language :: Python :: 2.7',
-        'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.3',
-        'Programming Language :: Python :: 3.4',
-        'Programming Language :: Python :: 3.5',
-    ],
-    # $ setup.py publish support.
-    cmdclass={
-        'upload': UploadCommand,
-    },
-)
diff --git a/exrex.py b/src/exrex.py
similarity index 100%
rename from exrex.py
rename to src/exrex.py
diff --git a/tox.ini b/tox.ini
deleted file mode 100644
index 8ed317b..0000000
--- a/tox.ini
+++ /dev/null
@@ -1,7 +0,0 @@
-[tox]
-envlist = py26, py27, py33, py34, py35
-minversion = 1.8
-skip_missing_interpreters = True
-
-[testenv]
-commands = {envpython} ./tests.py