diff --git a/dev-requirements.txt b/dev-requirements.txt
index 52313f8..52c8c7d 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -1,4 +1,4 @@
-mypy==0.670
+mypy==0.740
 pytest==4.3.0
 pytest-cov==2.6.1
 pytest-asyncio==0.10.0