diff --git a/pyproject.toml b/pyproject.toml
index 9cbd8623..227f0bff 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -73,7 +73,7 @@ dev = [
   "build==1.5.1",
   "lxml==6.1.1",
   "mypy==2.1.0",
-  "ruff==0.15.20",
+  "ruff==0.15.21",
   "twine==6.2.0",
   "typing_extensions==4.16.0",
 ]