diff --git a/requirements.txt b/requirements.txt
index 9a3b74d..708ede3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,25 +1,28 @@
+# 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>=0.6,!=0.7,<1.0
 anyjson>=0.3.3
 httplib2>=0.7.5
 jsonschema>=2.0.0,<3.0.0
 testtools>=0.9.34
 lxml>=2.3
-boto>=2.12.0,!=2.13.0
+boto>=2.32.1
 paramiko>=1.13.0
-netaddr>=0.7.6
+netaddr>=0.7.12
 python-ceilometerclient>=1.0.6
-python-glanceclient>=0.13.1
-python-keystoneclient>=0.9.0
-python-novaclient>=2.17.0
-python-neutronclient>=2.3.5,<3
-python-cinderclient>=1.0.7
+python-glanceclient>=0.14.0
+python-keystoneclient>=0.10.0
+python-novaclient>=2.18.0
+python-neutronclient>=2.3.6,<3
+python-cinderclient>=1.1.0
 python-heatclient>=0.2.9
-python-ironicclient
-python-saharaclient>=0.6.0
-python-swiftclient>=2.0.2
+python-ironicclient>=0.2.1
+python-saharaclient>=0.7.3
+python-swiftclient>=2.2.0
 testresources>=0.2.4
 testrepository>=0.0.18
-oslo.config>=1.2.1
+oslo.config>=1.4.0  # Apache-2.0
 six>=1.7.0
 iso8601>=0.1.9
 fixtures>=0.3.14