diff --git a/pyproject.toml b/pyproject.toml
index 34eb652..f3b27b5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -16,7 +16,7 @@ dependencies = []
 
 [project.optional-dependencies]
 lint = [
-    "clang-format==20.*",
+    "clang-format==21.*",
     "flake8==7.3.0",
 ]