diff --git a/pyproject.toml b/pyproject.toml
index e99493a..5c218cc 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -52,7 +52,7 @@ classifiers = [
 [project.optional-dependencies]
 quality = [
     "ruff==0.12.3",
-    "ty==0.0.1a14",
+    "ty==0.0.1a21",
     "pre-commit==4.2.0",
 ]
 test = [