diff --git a/requirements.txt b/requirements.txt
index 6cdda0b16..10beceea7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 django>=1.6,<1.7
 django-reversion==1.8.5
 dj-database-url
-south
+south>=1.0
 lxml
 pycrypto
 sievelib