diff --git a/requirements.txt b/requirements.txt
index 954ac4e37..bafbb386d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,5 +4,5 @@ iso8601>=0.1.8
 PrettyTable>=0.7,<0.8
 requests>=1.1
 simplejson>=2.0.9
-six>=1.4.1
+six>=1.5.2
 Babel>=1.3