diff --git a/requirements.txt b/requirements.txt
index a26c172..75b4675 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
 # Horizon Core Requirements
 Django<1.9,>=1.8 # BSD
 django-compressor>=2.0 # MIT