diff --git a/requirements-dev.txt b/requirements-dev.txt
index 0578c03bd..f5cde59e8 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -7,7 +7,7 @@ coveralls==1.8.2
 flake8==3.7.8
 flake8-type-annotations==0.1.0
 flake8-tidy-imports==3.0.0
-mypy==0.730
+mypy==0.740
 pytest==5.2.1
 pytest-asyncio==0.10.0
 pytest-cov==2.8.1