diff --git a/requirements.txt b/requirements.txt
index 48d91742cd..e63923af97 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 # The order of packages is significant, because pip processes them in the order
 # 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,>=1.8 # Apache-2.0
+pbr>=1.8 # Apache-2.0
 SQLAlchemy<1.1.0,>=1.0.10 # MIT
 eventlet!=0.18.3,>=0.18.2 # MIT
 keystonemiddleware>=4.12.0 # Apache-2.0
@@ -47,4 +47,4 @@ enum34;python_version=='2.7' or python_version=='2.6' or python_version=='3.3' #
 xmltodict>=0.10.1 # MIT
 pycrypto>=2.6 # Public Domain
 oslo.policy>=1.17.0 # Apache-2.0
-diskimage-builder>=1.1.2,!=1.6.0,!=1.7.0,!=1.7.1  # Apache-2.0
+diskimage-builder!=1.6.0,!=1.7.0,!=1.7.1,>=1.1.2 # Apache-2.0