diff --git a/pyproject.toml b/pyproject.toml
index 9b3959c..26d21a2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -16,7 +16,7 @@ pyyaml = "6.0"
 requests = "~2.28"
 
 [tool.poetry.dev-dependencies]
-mypy = "0.990"
+mypy = "0.991"
 pylint = "~2.15"
 rope = "~1.4"
 types-PyYAML = "~6.0"