diff --git a/pyproject.toml b/pyproject.toml
index cb2cf87..678cfe7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -95,7 +95,7 @@ optional-dependencies.develop = [
   "mypy<1.14",
   "poethepoet<0.31",
   "pyproject-fmt<2.6",
-  "ruff<0.8",
+  "ruff<0.9",
   "validate-pyproject<0.24",
 ]
 optional-dependencies.doc = [