diff --git a/requirements.txt b/requirements.txt
index 413c5cb..125b54e 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
 discover
 fixtures>=0.3.14
 python-subunit>=0.0.18