diff --git a/requirements-dev.txt b/requirements-dev.txt
index 5f945f0a3..768509903 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -9,4 +9,4 @@ pytest-mock==1.10.1
 pytest-asyncio==0.10.0
 pytest-cov==2.6.1
 coveralls==1.5.1
-mypy==0.660
+mypy==0.670