diff --git a/requirements.txt b/requirements.txt
index 1140a09..e70ea6f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,6 +7,6 @@ osc-lib>=1.2.0 # Apache-2.0
 oslo.i18n>=2.1.0 # Apache-2.0
 oslo.serialization>=1.10.0 # Apache-2.0
 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
 six>=1.9.0 # MIT