diff --git a/pyproject.toml b/pyproject.toml
index 4849f0b5..f5c5a4b6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,3 +1,15 @@
 [build-system]
 requires = ["setuptools>=62.3", "oldest-supported-numpy", "cython~=3.0", "raysect==0.8.1.*"]
 build-backend="setuptools.build_meta"
+
+[tool.ruff]
+line-length = 120
+include = ["cherab/**/*.py", "demos/**/*.py"]
+
+[tool.ruff.lint]
+ignore = [
+    "F401",  # ignore unused imports
+]
+
+[tool.cython-lint]
+max-line-length = 140