diff --git a/dev-requirements.txt b/dev-requirements.txt
index fefee17..50ce717 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -2,7 +2,7 @@
 flake8
 
 # Static type checking
-mypy==0.961
+mypy==0.991
 
 # Automatic code formatting
 black==22.3.0