diff --git a/pyproject.toml b/pyproject.toml
index bf39f9124..72b10b431 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -90,7 +90,7 @@ dev = [
     "towncrier==26.9.0",
     "ty==0.0.79",
     "types-requests==2.33.0.20260906",
-    "vale==3.20.0.0",
+    "vale==3.21.0.0",
     "vulture==2.16",
     "vws-python-mock==2026.9.6",
     "vws-test-fixtures==2026.8.26",