diff --git a/tests/requirements.txt b/tests/requirements.txt
index 3073d5b3..90941609 100644
--- a/tests/requirements.txt
+++ b/tests/requirements.txt
@@ -1,7 +1,7 @@
 coverage==4.3.4
 docutils==0.13.1
 flake8==3.3.0
-mypy==0.471
+mypy==0.501
 pycodestyle==2.3.1
 pyflakes==1.5.0
 pytest==3.0.6