diff --git a/requirements.txt b/requirements.txt
index 69d2ae0e6..3613eac7d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,6 +11,6 @@ python-keystoneclient>=0.6.0
 python-memcached>=1.48
 WebOb>=1.2.3
 stevedore>=0.14
-six>=1.4.1
+six>=1.5.2
 oslo.config>=1.2.0
 SQLAlchemy>=0.7.8,<=0.8.99