diff --git a/requirements.txt b/requirements.txt
index b1acf1825..1eabc6f06 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 d2to1>=0.2.10,<0.3
-pbr>=0.5.10,<0.6
+pbr>=0.5.16,<0.6
 argparse
-cliff>=1.3.2
+cliff>=1.4
 httplib2
 iso8601
 prettytable>=0.6,<0.8
diff --git a/tox.ini b/tox.ini
index 61a839c56..fb9729e4b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -12,6 +12,7 @@ commands = python setup.py testr --testr-args='{posargs}'
 
 [testenv:pep8]
 commands = flake8
+distribute = false
 
 [testenv:venv]
 commands = {posargs}