diff --git a/tools/pip-requires b/tools/pip-requires
index 1bf5c7c8..f4ac2b9a 100644
--- a/tools/pip-requires
+++ b/tools/pip-requires
@@ -5,6 +5,7 @@ flask==0.9
 jsonschema>=1.0.0
 oslo.config>=1.1.0
 paramiko>=1.8.0
+pbr>=0.5.13,<0.6
 python-keystoneclient>=0.2,<0.3
 python-novaclient>=2.12.0,<3
 six