diff --git a/requirements.txt b/requirements.txt
index 5ebcb65..b25b9d3 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,>=1.4
+pbr<2.0,>=1.6
 cliff>=1.14.0 # Apache-2.0
 anyjson>=0.3.3
 httplib2>=0.7.5
@@ -9,11 +9,11 @@
 testtools>=1.4.0
 boto>=2.32.1
 paramiko>=1.13.0
-netaddr>=0.7.12,!=0.7.16
+netaddr!=0.7.16,>=0.7.12
 testrepository>=0.0.18
 pyOpenSSL>=0.14
 oslo.concurrency>=2.3.0 # Apache-2.0
-oslo.config>=2.1.0 # Apache-2.0
+oslo.config>=2.3.0 # Apache-2.0
 oslo.i18n>=1.5.0 # Apache-2.0
 oslo.log>=1.8.0 # Apache-2.0
 oslo.serialization>=1.4.0 # Apache-2.0