diff --git a/requirements.txt b/requirements.txt
index c890b55c7..4419fef0c 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.
 Babel!=2.4.0,>=2.3.4 # BSD
-pbr>=2.0.0 # Apache-2.0
+pbr!=2.1.0,>=2.0.0 # Apache-2.0
 PyYAML>=3.10.0 # MIT
 flake8<2.6.0,>=2.5.4 # MIT
 six>=1.9.0 # MIT