diff --git a/RELEASE.md b/RELEASE.md
index a5a69af..9b8c47a 100644
--- a/RELEASE.md
+++ b/RELEASE.md
@@ -45,9 +45,9 @@ Example `version`
 - Publish on PyPi:
 
       git clean -fxd
-      pip install flit
-      flit build
-      flit publish
+      pip install -U build twine wheel
+      python -m build --sdist --wheel
+      twine upload -s dist/*
 
 - Update `version` in `pyproject.toml`.
 
diff --git a/pyproject.toml b/pyproject.toml
index 5ec5c19..22ac6e3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [build-system]
-requires = ["flit_core >=3.7,<4"]
-build-backend = "flit_core.buildapi"
+requires = ["setuptools>=61.2"]
+build-backend = "setuptools.build_meta"
 
 [project]
 name = "yaml2ics"
@@ -18,7 +18,7 @@ classifiers = [
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",
 ]
-dynamic = ["description"]
+description = "CLI to convert yaml into ics."
 
 dependencies = [
     "ics == 0.8.0.dev0",
@@ -37,9 +37,6 @@ yaml2ics = "yaml2ics:cli"
 Home = "https://github.com/scientific-python/yaml2ics"
 Source = "https://github.com/scientific-python/yaml2ics"
 
-[tool.flit.sdist]
-exclude = ["tests/*"]
-
 [tool.ruff]
 line-length = 88
 target-version = "py38"