diff --git a/dev-requirements.txt b/dev-requirements.txt
index 913b1c0..b315755 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -7,7 +7,7 @@ black==22.12.0
 django-browser-reload==1.6.0
 django-debug-toolbar==3.8.1
 types-requests==2.28.5
-mypy==0.990
+mypy==0.991
 wagtail-factories==4.0.0
 coverage==7.0.3
 flake8-bugbear==22.12.6