diff --git a/requirements.txt b/requirements.txt
index aeb18936f..0c93734aa 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,5 +12,5 @@ oslo.utils>=1.2.0                       # Apache-2.0
 requests>=2.2.0,!=2.4.0
 python-keystoneclient>=1.1.0
 simplejson>=2.2.0
-six>=1.7.0
+six>=1.9.0
 Babel>=1.3