diff --git a/pyproject.toml b/pyproject.toml
index ce42037..3780f9d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,3 +1,55 @@
+[project]
+name = "ptpython"
+version = "3.0.29"
+description = "Python REPL build on top of prompt_toolkit"
+readme = "README.rst"
+authors = [{ name = "Jonathan Slenders" }]
+classifiers = [
+    "License :: OSI Approved :: BSD License",
+    "Programming Language :: Python :: 3",
+    "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",
+    "Programming Language :: Python :: 3.13",
+    "Programming Language :: Python :: 3 :: Only",
+    "Programming Language :: Python",
+]
+requires-python = ">=3.8"
+dependencies = [
+    "appdirs",
+    "jedi>=0.16.0",
+    # Use prompt_toolkit 3.0.43, because of `OneStyleAndTextTuple` import.
+    "prompt_toolkit>=3.0.43,<3.1.0",
+    "pygments",
+]
+
+
+[project.urls]
+Homepage = "https://github.com/prompt-toolkit/ptpython"
+Changelog = "https://github.com/prompt-toolkit/ptpython/blob/master/CHANGELOG"
+"Bug Tracker" = "https://github.com/prompt-toolkit/ptpython/issues"
+"Source Code" = "https://github.com/prompt-toolkit/ptpython"
+
+
+[project.scripts]
+ptpython = "ptpython.entry_points.run_ptpython:run"
+ptipython = "ptpython.entry_points.run_ptipython:run"
+
+
+[project.optional-dependencies]
+ptipython = ["ipython"] # For ptipython, we need to have IPython
+
+
+[tool.mypy]
+ignore_missing_imports = true
+no_implicit_optional = true
+platform = "win32"
+strict_equality = true
+strict_optional = true
+
+
 [tool.ruff]
 target-version = "py37"
 lint.select = [
@@ -27,9 +79,13 @@ lint.ignore = [
 "ptpython/ipython.py" = ["T100"]  # Import usage.
 "ptpython/repl.py" = ["T201"]  # Print usage.
 "ptpython/printer.py" = ["T201"]  # Print usage.
-"tests/run_tests.py" = ["F401"]  # Unused imports.
 
 
 [tool.ruff.lint.isort]
 known-first-party = ["ptpython"]
 known-third-party = ["prompt_toolkit", "pygments", "asyncssh"]
+
+
+[build-system]
+requires = ["setuptools>=68"]
+build-backend = "setuptools.build_meta"
diff --git a/setup.cfg b/setup.cfg
deleted file mode 100644
index 80dfec6..0000000
--- a/setup.cfg
+++ /dev/null
@@ -1,41 +0,0 @@
-[bdist_wheel]
-universal=1
-
-[flake8]
-exclude=__init__.py
-max_line_length=150
-ignore=
-  E114,
-  E116,
-  E117,
-  E121,
-  E122,
-  E123,
-  E125,
-  E126,
-  E127,
-  E128,
-  E131,
-  E171,
-  E203,
-  E211,
-  E221,
-  E227,
-  E231,
-  E241,
-  E251,
-  E301,
-  E402,
-  E501,
-  E701,
-  E702,
-  E704,
-  E731,
-  E741,
-  F401,
-  F403,
-  F405,
-  F811,
-  W503,
-  W504,
-  E722
diff --git a/setup.py b/setup.py
deleted file mode 100644
index bd2f962..0000000
--- a/setup.py
+++ /dev/null
@@ -1,66 +0,0 @@
-#!/usr/bin/env python
-import os
-import sys
-
-from setuptools import find_packages, setup
-
-with open(os.path.join(os.path.dirname(__file__), "README.rst")) as f:
-    long_description = f.read()
-
-
-setup(
-    name="ptpython",
-    author="Jonathan Slenders",
-    version="3.0.29",
-    url="https://github.com/prompt-toolkit/ptpython",
-    description="Python REPL build on top of prompt_toolkit",
-    long_description=long_description,
-    package_urls={
-        "Changelog": "https://github.com/prompt-toolkit/ptpython/blob/master/CHANGELOG",
-    },
-    project_urls={
-        "Bug Tracker": "https://github.com/prompt-toolkit/ptpython/issues",
-        "Source Code": "https://github.com/prompt-toolkit/ptpython",
-        "Changelog": "https://github.com/prompt-toolkit/ptpython/blob/master/CHANGELOG",
-    },
-    packages=find_packages("."),
-    package_data={"ptpython": ["py.typed"]},
-    install_requires=[
-        "appdirs",
-        "jedi>=0.16.0",
-        # Use prompt_toolkit 3.0.43, because of `OneStyleAndTextTuple` import.
-        "prompt_toolkit>=3.0.43,<3.1.0",
-        "pygments",
-    ],
-    python_requires=">=3.8",
-    classifiers=[
-        "License :: OSI Approved :: BSD License",
-        "Programming Language :: Python :: 3",
-        "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",
-        "Programming Language :: Python :: 3.13",
-        "Programming Language :: Python :: 3 :: Only",
-        "Programming Language :: Python",
-    ],
-    entry_points={
-        "console_scripts": [
-            "ptpython = ptpython.entry_points.run_ptpython:run",
-            "ptipython = ptpython.entry_points.run_ptipython:run",
-            f"ptpython{sys.version_info[0]} = ptpython.entry_points.run_ptpython:run",
-            "ptpython{}.{} = ptpython.entry_points.run_ptpython:run".format(
-                *sys.version_info[:2]
-            ),
-            f"ptipython{sys.version_info[0]} = ptpython.entry_points.run_ptipython:run",
-            "ptipython{}.{} = ptpython.entry_points.run_ptipython:run".format(
-                *sys.version_info[:2]
-            ),
-        ]
-    },
-    extras_require={
-        "ptipython": ["ipython"],  # For ptipython, we need to have IPython
-        "all": ["black"],  # Black not always possible on PyPy
-    },
-)