diff --git a/requirements.txt b/requirements.txt
index ade8e999b..c2221da70 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -23,7 +23,7 @@ oslo.service>=1.10.0 # Apache-2.0
 oslo.utils>=3.20.0 # Apache-2.0
 oslo.versionedobjects>=1.17.0 # Apache-2.0
 PasteDeploy>=1.5.0 # MIT
-pbr>=2.0.0 # Apache-2.0
+pbr!=2.1.0,>=2.0.0 # Apache-2.0
 pecan!=1.0.2,!=1.0.3,!=1.0.4,!=1.2,>=1.0.0 # BSD
 PrettyTable<0.8,>=0.7.1 # BSD
 voluptuous>=0.8.9 # BSD License