diff --git a/README.rst b/README.rst
index e8ad7ea..397ec6e 100644
--- a/README.rst
+++ b/README.rst
@@ -44,7 +44,10 @@ The available objects and functions from the `ppl` Python module are:
 Installation
 ------------
 
+<<<<<<< HEAD
+=======
 
+>>>>>>> upstream/master
 The project is available at `Python Package Index <https://pypi.org/project/pplpy/>`_ and
 can be installed with pip::
 
diff --git a/docs/source/conf.py b/docs/source/conf.py
index f694f64..c5fa891 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -43,16 +43,9 @@
 # built documents.
 #
 # The short X.Y version.
-import configparser
-config = configparser.ConfigParser(allow_no_value=True)
-try:
-    with open("../../setup.cfg", encoding='utf-8') as f:
-        config.read_string(f.read())
-except TypeError:
-    # NOTE: encoding is not a keyword in Python 2
-    with open("../../setup.cfg") as f:
-        config.read_string(f.read().decode('utf-8'))
-version = release = config['metadata']['version']
+from ppl import __version__ as release
+
+version = release
 
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.
diff --git a/ppl/__init__.py b/ppl/__init__.py
index e983530..3452bfc 100644
--- a/ppl/__init__.py
+++ b/ppl/__init__.py
@@ -127,6 +127,8 @@
   Remove the _mutable_immutable class.
 """
 
+__version__ = "0.8.9"
+
 from .linear_algebra import (
         Variable, Variables_Set, Linear_Expression,
         )
diff --git a/pyproject.toml b/pyproject.toml
index 8e1ed36..5a92e93 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,3 +1,62 @@
 [build-system]
-requires = ["setuptools", "wheel", "Cython", "cysignals", "sphinx", "gmpy2>=2.1.0b1"]
+requires = [
+    "setuptools>=61.2",
+    "Cython",
+    "cysignals",
+    "gmpy2>=2.1.0b1",
+]
 build-backend = "setuptools.build_meta"
+
+[project]
+name = "pplpy"
+description = "Python PPL wrapper"
+readme = "README.rst"
+authors = [{name = "Vincent Delecroix", email = "vincent.delecroix@labri.fr"}]
+license = {text = "GPL v3"}
+classifiers = [
+    "License :: OSI Approved :: GNU General Public License v3 (GPLv3)",
+    "Programming Language :: C++",
+    "Programming Language :: Python",
+    "Development Status :: 5 - Production/Stable",
+    "Operating System :: Unix",
+    "Intended Audience :: Science/Research",
+    "Programming Language :: Python :: 3.8",
+    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+]
+keywords = [
+    "polyhedron",
+    "polytope",
+    "convex",
+    "mathematics",
+    "ppl",
+    "milp",
+    "linear-programming",
+]
+dependencies = [
+    "cysignals",
+    "gmpy2>=2.1.0b1",
+]
+dynamic = ["version"]
+
+[project.optional-dependencies]
+doc = [
+    "sphinx",
+]
+
+[project.urls]
+Homepage = "https://github.com/sagemath/pplpy"
+Download = "https://pypi.org/project/pplpy/#files"
+
+[tool.setuptools]
+packages = ["ppl"]
+platforms = ["any"]
+include-package-data = false
+
+[tool.setuptools.dynamic]
+version = {attr = "ppl.__version__"}
+
+[tool.setuptools.package-data]
+ppl = ["*.pxd", "*.h", "*.hh"]
diff --git a/setup.cfg b/setup.cfg
deleted file mode 100644
index 10092be..0000000
--- a/setup.cfg
+++ /dev/null
@@ -1,37 +0,0 @@
-[metadata]
-name = pplpy
-version = 0.8.8
-description = Python PPL wrapper
-long_description = file: README.rst
-author = Vincent Delecroix
-author_email = vincent.delecroix@labri.fr
-url = https://github.com/sagemath/pplpy
-download_url = https://pypi.org/project/pplpy/#files
-license = GPL v3
-platforms = any
-classifiers =
-    License :: OSI Approved :: GNU General Public License v3 (GPLv3)
-    Programming Language :: C++
-    Programming Language :: Python
-    Development Status :: 5 - Production/Stable
-    Operating System :: Unix
-    Intended Audience :: Science/Research
-    Programming Language :: Python :: 3.8
-    Programming Language :: Python :: 3.9
-    Programming Language :: Python :: 3.10
-    Programming Language :: Python :: 3.11
-    Programming Language :: Python :: 3.12
-keywords =
-    polyhedron
-    polytope
-    convex
-    mathematics
-    ppl
-    milp
-    linear-programming
-
-[options]
-packages = ppl
-
-[options.package_data]
-ppl = *.pxd, *.h, *.hh