diff --git a/pyproject.toml b/pyproject.toml
index fd4723b9..89728528 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -79,7 +79,7 @@ optional-dependencies.dev = [
     # See: https://vws-python.github.io/vws-python-mock/installation.html#faster-installation
     "torch>=2.5.1",
     "torchvision>=0.20.1",
-    "ty==0.0.20",
+    "ty==0.0.21",
     "types-pyyaml==6.0.12.20250915",
     "vulture==2.15",
     "vws-python-mock==2026.2.22.3",