diff --git a/requirements.txt b/requirements.txt
index 5c1f150..6cb8d0d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@
 PrettyTable<0.8,>=0.7.1 # BSD
 six>=1.9.0 # MIT
 oslo.utils>=3.20.0 # Apache-2.0
-pbr>=2.0.0 # Apache-2.0
+pbr!=2.1.0,>=2.0.0 # Apache-2.0
 requests!=2.12.2,!=2.13.0,>=2.10.0 # Apache-2.0
 keystoneauth1>=2.18.0 # Apache-2.0
 stevedore>=1.20.0 # Apache-2.0