diff --git a/README.md b/README.md
index 0b41297f..9551b720 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@ Python framework for processing Universal Dependencies data
 [![Documentation Status](https://readthedocs.org/projects/udapi/badge/)](http://udapi.readthedocs.io)
 
 ## Requirements
-- You need Python 3.6 or higher.
+- You need Python 3.9 or higher.
 - If the [ufal.udpipe](https://pypi.python.org/pypi/ufal.udpipe/) parser is needed,
   make sure you have a C++11 compiler (e.g. [g++ 4.7 or newer](.travis.yml#L9))
   and install UDPipe with `pip3 install --user --upgrade ufal.udpipe`.
diff --git a/pyproject.toml b/pyproject.toml
index 374b58cb..18d5c717 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,36 @@
 [build-system]
-requires = [
-    "setuptools>=42",
-    "wheel"
-]
+requires = ["setuptools>=42", "wheel"]
 build-backend = "setuptools.build_meta"
+
+[project]
+name = "udapi"
+version = "0.5.2"
+description = "Python framework for processing Universal Dependencies data"
+readme = "README.md"
+requires-python = ">=3.9"
+license = "GPL-3.0-or-later"
+authors = [
+    {name = "Martin Popel", email = "popel@ufal.mff.cuni.cz"}
+]
+classifiers = [
+    "Programming Language :: Python :: 3",
+    "Operating System :: OS Independent",
+]
+dependencies = [
+    "colorama",
+    "termcolor",
+]
+
+[project.urls]
+Homepage = "https://github.com/udapi/udapi-python"
+
+[project.optional-dependencies]
+test = ["pytest"]
+udpipe = ["ufal.udpipe"]
+
+[project.scripts]
+udapy = "udapi.cli:main"
+
+[tool.setuptools]
+packages = {find = {}}
+include-package-data = true
diff --git a/setup.cfg b/setup.cfg
deleted file mode 100644
index 2cdfaaa9..00000000
--- a/setup.cfg
+++ /dev/null
@@ -1,29 +0,0 @@
-[metadata]
-name = udapi
-version = 0.5.1
-author = Martin Popel
-author_email = popel@ufal.mff.cuni.cz
-description = Python framework for processing Universal Dependencies data
-long_description = file: README.md
-long_description_content_type = text/markdown
-url = https://github.com/udapi/udapi-python
-classifiers =
-    Programming Language :: Python :: 3
-    License :: OSI Approved :: GNU General Public License v2 or later (GPLv2+)
-    Operating System :: OS Independent
-
-[options]
-packages = find:
-python_requires = >=3.9
-include_package_data = True
-install_requires =
-    colorama
-    termcolor
-
-[options.entry_points]
-console_scripts =
-    udapy = udapi:cli.main
-
-[options.extras_require]
-test =
-    pytest
diff --git a/setup.py b/setup.py
deleted file mode 100644
index 7f1a1763..00000000
--- a/setup.py
+++ /dev/null
@@ -1,4 +0,0 @@
-from setuptools import setup
-
-if __name__ == "__main__":
-    setup()