diff --git a/requirements.txt b/requirements.txt
index 3b9ec44..4f6a1d3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,20 +5,20 @@
 jsonschema>=1.3.0,!=1.4.0
 testtools>=0.9.32
 lxml>=2.3
-boto>=2.4.0
+boto>=2.4.0,!=2.13.0
 paramiko>=1.8.0
 netaddr
 python-glanceclient>=0.9.0
-python-keystoneclient>=0.3.0
-python-novaclient>=2.12.0
-python-neutronclient>=2.2.3,<3
-python-cinderclient>=1.0.4
+python-keystoneclient>=0.4.1
+python-novaclient>=2.15.0
+python-neutronclient>=2.3.0,<3
+python-cinderclient>=1.0.6
 python-heatclient>=0.2.3
 testresources>=0.2.4
-keyring>=1.6.1
+keyring>=1.6.1,<2.0
 testrepository>=0.0.17
 oslo.config>=1.2.0
 eventlet>=0.13.0
-six<1.4.0
+six>=1.4.1
 iso8601>=0.1.4
 fixtures>=0.3.14