diff --git a/requirements.txt b/requirements.txt
index d76f9094..0cc8e5cb 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,7 +7,8 @@ python-daemon
 irc
 pyyaml
 lockfile
-pbr>=0.5.21,<1.0
+pbr>=0.6,!=0.7,<1.0
 Babel>=0.9.6
 launchpadlib
 Jinja2
+argparse