diff --git a/requirements.txt b/requirements.txt
index 5547d89676..5fa919fcb3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,10 +1,10 @@
-pbr>=0.6,<1.0
+pbr>=0.6,!=0.7,<1.0
 cliff>=1.4.3
-keyring>=1.6.1,<2.0,>=2.1
+keyring>=2.1
 pycrypto>=2.6
 python-glanceclient>=0.9.0
-python-keystoneclient>=0.6.0
+python-keystoneclient>=0.7.0
 python-novaclient>=2.17.0
 python-cinderclient>=1.0.6
 requests>=1.1
-six>=1.5.2
+six>=1.6.0