diff --git a/requirements.txt b/requirements.txt
index b7b3f3a9f..641fd2793 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,7 +8,7 @@ coverage==6.5.0
 flake8==3.9.2
 importlib-metadata==4.13.0
 isort==5.10.1
-mypy==0.971
+mypy==0.991
 typing_extensions==4.4.0
 types-contextvars==2.4.7
 types-PyYAML==6.0.12