diff --git a/requirements.txt b/requirements.txt
index cb0031d..1d512a0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,22 +1,22 @@
 # 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>=0.11,<2.0
+pbr<2.0,>=0.11
 anyjson>=0.3.3
 httplib2>=0.7.5
-jsonschema>=2.0.0,<3.0.0,!=2.5.0
-testtools>=0.9.36,!=1.2.0
+jsonschema!=2.5.0,<3.0.0,>=2.0.0
+testtools>=1.4.0
 boto>=2.32.1
 paramiko>=1.13.0
 netaddr>=0.7.12
 testrepository>=0.0.18
 pyOpenSSL>=0.11
-oslo.concurrency>=2.0.0         # Apache-2.0
-oslo.config>=1.11.0  # Apache-2.0
-oslo.i18n>=1.5.0  # Apache-2.0
-oslo.log>=1.2.0  # Apache-2.0
-oslo.serialization>=1.4.0               # Apache-2.0
-oslo.utils>=1.4.0                       # Apache-2.0
+oslo.concurrency>=2.0.0 # Apache-2.0
+oslo.config>=1.11.0 # Apache-2.0
+oslo.i18n>=1.5.0 # Apache-2.0
+oslo.log>=1.2.0 # Apache-2.0
+oslo.serialization>=1.4.0 # Apache-2.0
+oslo.utils>=1.6.0 # Apache-2.0
 six>=1.9.0
 iso8601>=0.1.9
 fixtures>=0.3.14