diff --git a/pyproject.toml b/pyproject.toml
index 123329f..4ebbea9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,7 +14,7 @@ pytest = "^7.0.1"
 black = "^22.10"
 isort = "^5.8.0"
 autoflake = "^2.0.0"
-mypy = "^0.971"
+mypy = "^0.991"
 
 [build-system]
 requires = ["poetry>=0.12"]