diff --git a/requirements.txt b/requirements.txt
index 2f8fd71e26e4..dac719fc75be 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,3 +11,4 @@ nose==1.3.0
 colorama==0.2.5
 mock==1.0.1
 rsa==3.1.2
+six>=1.8.0