diff --git a/requirements.txt b/requirements.txt
index be516140e..16bd95674 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -14,12 +14,12 @@ Paste
 PasteDeploy>=1.5.0
 pbr>=0.6,!=0.7,<1.0
 pecan>=0.4.5
-python-keystoneclient>=0.7.0
+python-keystoneclient>=0.9.0
 python-neutronclient>=2.3.4,<3
 Routes>=1.12.3
-six>=1.5.2
+six>=1.6.0
 SQLAlchemy>=0.7.8,<=0.9.99
-sqlalchemy-migrate>=0.8.2,!=0.8.4
+sqlalchemy-migrate>=0.9.1
 stevedore>=0.14
 WebOb>=1.2.3
 dnspython>=1.9.4
diff --git a/setup.py b/setup.py
index 70c2b3f32..736375744 100755
--- a/setup.py
+++ b/setup.py
@@ -17,6 +17,14 @@
 # THIS FILE IS MANAGED BY THE GLOBAL REQUIREMENTS REPO - DO NOT EDIT
 import setuptools
 
+# In python < 2.7.4, a lazy loading of package `pbr` will break
+# setuptools if some other modules registered functions in `atexit`.
+# solution from: http://bugs.python.org/issue15881#msg170215
+try:
+    import multiprocessing  # noqa
+except ImportError:
+    pass
+
 setuptools.setup(
     setup_requires=['pbr'],
     pbr=True)