diff --git a/requirements-dev.txt b/requirements-dev.txt
index 17fd99a0f..1eab3aa77 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -8,7 +8,7 @@
 coveralls==3.3.1
 flake8==5.0.4
 flake8-tidy-imports==4.8.0
-mypy==0.990
+mypy==0.991
 pre-commit==2.20.0
 pytest==7.2.0
 pytest-asyncio==0.20.2