diff --git a/setup.py b/setup.py
index f202a2b..11b4d27 100644
--- a/setup.py
+++ b/setup.py
@@ -20,7 +20,7 @@
     "pytest>=3",
     "isort==5.10.1",
     "pycodestyle==2.8.0",
-    "mypy==0.942",
+    "mypy==0.991",
 ]
 
 setup(