diff --git a/.github/workflows/pypi-publish.yml b/.github/workflows/pypi-publish.yml
index 5e8a06d2..7991f032 100644
--- a/.github/workflows/pypi-publish.yml
+++ b/.github/workflows/pypi-publish.yml
@@ -88,17 +88,16 @@ jobs:
       run: |
         python -m venv venv
         source venv/bin/activate
-        python -m pip install --upgrade pip setuptools wheel twine
-        pip install build
+        python -m pip install --upgrade pip setuptools wheel twine build
         sudo apt update
         sudo apt install -y twine
         
     - name: Build Python package
       run: |
+        source venv/bin/activate
         echo "Using version $PKG_VERSION_STRICT"
         sed -i -r -e "s/^__version__ += '.*'$/__version__ = '$PKG_VERSION_STRICT'/" xml2rfc/__init__.py
-        python ./setup.py setopt --command=metadata --option=version --set-value=$PKG_VERSION_STRICT
-        python ./setup.py sdist --dist-dir dist
+        python -m build --sdist
         
     - name: Publish to Test PyPI
       if: env.SHOULD_DEPLOY != 'true'
diff --git a/MANIFEST.in b/MANIFEST.in
index d6b458cc..ede0827c 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -9,3 +9,4 @@ include tests/valid/*
 include tox.ini
 include requirements.txt
 include xml2rfc/data/*
+include xml2rfc/templates/*
diff --git a/Makefile b/Makefile
index 1dabbd52..439d1002 100644
--- a/Makefile
+++ b/Makefile
@@ -73,16 +73,18 @@ env/bin/python:
 .PHONY: install
 install:
 	python3 --version
-	python3 setup.py --quiet install
-	python3 configtest.py
+	python3 -m pip install . --quiet
 	rm -rf xml2rfc.egg-info/
 
-test:	install flaketest xml2rfc/data/v3.rng pytests
+test:	install flaketest xml2rfc/data/v3.rng pytests configtest
 
 flaketest:
 	pyflakes xml2rfc
 	@[ -d tests/failed/ ] && rm -f tests/failed/*
 
+configtest:
+	python3 configtest.py
+
 pytests:
 	python3 test.py --verbose
 
diff --git a/docker/base.Dockerfile b/docker/base.Dockerfile
index b5101232..da8ba667 100644
--- a/docker/base.Dockerfile
+++ b/docker/base.Dockerfile
@@ -48,7 +48,14 @@ RUN mkdir -p ~/.fonts/opentype && \
     fc-cache -f
 
 # Copy everything required to build xml2rfc
-COPY requirements.txt setup.py README.md LICENSE Makefile configtest.py .
+COPY requirements.txt setup.py setup.cfg pyproject.toml README.md LICENSE Makefile configtest.py .
+
+
+# Install & update build tools
+RUN pip3 install --upgrade \
+    pip \
+    setuptools \
+    wheel
 
 # Install Python dependencies
 RUN pip3 install -r requirements.txt \
@@ -57,11 +64,10 @@ RUN pip3 install -r requirements.txt \
     dict2xml \
     "pypdf>=3.2.1"
 
-
 COPY xml2rfc ./xml2rfc
 
 # Build xml2rfc & finalize
 RUN make install && \
     pip3 uninstall -y decorator dict2xml pypdf && \
     rm setup.py Makefile configtest.py requirements.txt && \
-    rm -r xml2rfc build dist
+    rm -r xml2rfc build
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 00000000..9787c3bd
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,3 @@
+[build-system]
+requires = ["setuptools", "wheel"]
+build-backend = "setuptools.build_meta"
diff --git a/requirements.txt b/requirements.txt
index 5736a736..08b1bd83 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,10 +1,8 @@
 appdirs>=1.4.4
 configargparse>=1.2.3
 google-i18n-address>=2.3.2
-html5lib>=1.0.1
 intervaltree>=3.1.0
 jinja2>=3.1.2
-markupsafe>=2.1.1
 lxml>=4.9.0
 pycountry>=22.3.5
 pyyaml>=5.3.1
diff --git a/setup.cfg b/setup.cfg
index c198c7c2..419394b2 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,51 @@
 [metadata]
+name = xml2rfc
 version = 3.17.0
+description = xml2rfc generates RFCs and IETF drafts from document source in XML according to the IETF xml2rfc v2 and v3 vocabularies.
+long_description = file:  README.md
+long_description_content_type = text/markdown
+keywords = ietf, rfc, id, internet-draft, xml, xml2rfc
+author = Henrik Levkowetz
+author_email = tools-discuss@ietf.org
+maintainer = Kesara Rathnayake
+maintainer_email = kesara@staff.ietf.org
+url = /~https://github.com/ietf-tools/xml2rfc
+download_url = /~https://github.com/ietf-tools/xml2rfc/releases
+license = Revised BSD License
+classifiers =
+    Development Status :: 5 - Production/Stable
+    Environment :: Console
+    Operating System :: MacOS :: MacOS X
+    Operating System :: Microsoft :: Windows
+    Operating System :: POSIX :: Linux
+    Programming Language :: Python
+    Topic :: Text Processing
+    Topic :: Text Processing :: Markup :: XML
+    License :: OSI Approved :: BSD License
+    Programming Language :: Python :: 3
+    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
+
+[options]
+packages = xml2rfc, xml2rfc/writers, xml2rfc/util, xml2rfc/uniscripts, xml2rfc/data, xml2rfc/templates
+zip_safe = False
+include_package_data = True
+install_requires = file: requirements.txt
+
+[options.package_data]
+* =
+    data/*
+    templates/*
+
+[options.entry_points]
+console_scripts =
+    xml2rfc = xml2rfc.run:main
+
+[options.extras_require]
+pdf = weasyprint>=53.0,!=57.0
 
 [bdist_wheel]
 universal = 1
-
diff --git a/setup.py b/setup.py
index 13d34a30..b9b7f675 100644
--- a/setup.py
+++ b/setup.py
@@ -1,90 +1,5 @@
-#!/usr/bin/env python
-# -*- coding: utf-8 -*-
-# -------------------------------------------------------
-# Copyright The IETF Trust 2011-2022, All Rights Reserved
-# -------------------------------------------------------
-
-import os
-from codecs import open
 from setuptools import setup
-import sys
-# This workaround is necessary to make setup.py upload work with non-ascii
-# arguments to setup().  
-try:
-    reload(sys).setdefaultencoding("UTF-8") 
-except NameError:
-    pass
-
-description = "Xml2rfc generates RFCs and IETF drafts from document source in XML according to the IETF xml2rfc v2 and v3 vocabularies."
-
-here = os.path.abspath(os.path.dirname(__file__))
-
-# Get the long description from the README file
-with open(os.path.join(here, 'README.md'), encoding='utf-8') as file:
-    long_description = file.read()
-
-# Get the requirements from the local requirements.txt file
-with open(os.path.join(here, 'requirements.txt'), encoding='utf-8') as file:
-    requirements = file.read().splitlines()
-
 
 setup(
-    # Package metadata
     name='xml2rfc',
-    author='Henrik Levkowetz',
-    author_email='tools-discuss@ietf.org',
-    maintainer = "Kesara Rathnayake",
-    maintainer_email = "kesara@staff.ietf.org",
-    url='/~https://github.com/ietf-tools/xml2rfc',
-    description=description,
-    long_description=long_description,
-    long_description_content_type="text/markdown",
-    download_url = "/~https://github.com/ietf-tools/xml2rfc/releases",
-    classifiers= [
-        'Development Status :: 5 - Production/Stable',
-        'Environment :: Console',
-        'Operating System :: MacOS :: MacOS X',
-        'Operating System :: Microsoft :: Windows',
-        'Operating System :: POSIX :: Linux',
-        'Programming Language :: Python',
-        'Topic :: Text Processing',
-        'Topic :: Text Processing :: Markup :: XML',
-        'License :: OSI Approved :: BSD License',
-
-        # Specify the Python versions you support here. In particular, ensure
-        # that you indicate whether you support Python 2, Python 3 or both.
-        'Programming Language :: Python :: 3',
-        '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',
-    ],
-    license="BSD-3-Clause",
-
-    # Program data
-    #scripts=['scripts/xml2rfc'],
-    entry_points = {
-        'console_scripts' : [
-            'xml2rfc = xml2rfc.run:main',
-        ],
-    },
-
-    packages=['xml2rfc', 'xml2rfc/writers', 'xml2rfc/util', 'xml2rfc/uniscripts', ],
-    package_data={'xml2rfc': [
-        'templates/*',
-        'data/*',
-    ]},
-
-    install_requires = requirements,
-    tests_require = [
-        'decorator',
-        'dict2xml',
-        'pycairo',
-        'pypdf',
-        'tox',
-        'weasyprint',
-    ],
-
-    zip_safe = False,                   # We're reading templates from a package directory.
 )
diff --git a/tox.ini b/tox.ini
index 55a14dd3..3ad68919 100644
--- a/tox.ini
+++ b/tox.ini
@@ -5,6 +5,7 @@
 
 [tox]
 envlist = py{37,38,39,310,311}-{linux,macos,windows}
+isolated_build = True
 
 [gh-actions]
 python =
@@ -29,7 +30,6 @@ allowlist_externals =
     make
 
 deps =
-    -rrequirements.txt
     pyflakes
     decorator
     dict2xml