diff --git a/requirements.txt b/requirements.txt
index fd8d433a2..04259274f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 
-pbr>=2.0.0 # Apache-2.0
+pbr!=2.1.0,>=2.0.0 # Apache-2.0
 Babel!=2.4.0,>=2.3.4 # BSD
 python-etcd>=0.4.3 # MIT License
 cassandra-driver!=3.6.0,>=2.1.4 # Apache-2.0