diff --git a/requirements_dev.txt b/requirements_dev.txt
index f63454b..2383920 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -10,4 +10,4 @@ twine==1.12.1
 
 pytest==4.4.0
 pytest-runner==4.2
-mypy==0.700
+mypy==1.9.0