diff --git a/requirements.txt b/requirements.txt
index 62957e9..8a2300e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
 python_novaclient>=2.14.1,<2.14.2
 babel
-stevedore
\ No newline at end of file
+stevedore
+six>=1.4.1