diff --git a/requirements.txt b/requirements.txt
index 1f1f75fb..3f1138c2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,6 +2,7 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 
+pbr>=0.6,!=0.7,<1.0
 Babel>=1.3
 six>=1.7.0
 iso8601>=0.1.9