diff --git a/pyproject.toml b/pyproject.toml
index 36107b6..ccf2366 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -9,7 +9,7 @@ dependencies = []
 [dependency-groups]
 dev = [
     "cmake==4.2.1",
-    "clang-format==18.1.8",
+    "clang-format==21.1.8",
     "gcovr>=7.2",
     "pre-commit>=3.7.1",
 ]