diff --git a/pyproject.toml b/pyproject.toml
index 2dc6cd4..e307289 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -28,6 +28,9 @@ dev = [
     "ruff>=0.14.0",
 ]
 
+[tool.ruff]
+line-length = 120
+
 [tool.ruff.lint]
 select = ["ALL"]