diff --git a/requirements.txt b/requirements.txt
index 9ced8b5..38936b7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,4 +4,4 @@ pep8==1.5.6
 pyflakes==0.8.1
 flake8==2.1.0
 
-six>=1.5.2
+six>=1.6.0