diff --git a/requirements.txt b/requirements.txt
index 0f0e2e2c..359362e9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
 pbr>=0.6,!=0.7,<1.0
-six>=1.5.2
+six>=1.6.0
 
 python-saharaclient>=0.6.0