diff --git a/requirements/dev.txt b/requirements/dev.txt
index 76ceb68..2a2e6e4 100644
--- a/requirements/dev.txt
+++ b/requirements/dev.txt
@@ -5,7 +5,7 @@
 -r base.txt
 
 bumpversion==0.6.0
-mypy==0.790
+mypy==0.991
 pylint==2.6.0
 bandit==1.6.3
 safety==1.9.0