diff --git a/tools/pip-requires b/tools/pip-requires
index 758442c..4873d75 100644
--- a/tools/pip-requires
+++ b/tools/pip-requires
@@ -1,3 +1,5 @@
+d2to1>=0.2.10,<0.3
+pbr>=0.5,<0.6
 anyjson
 nose
 httplib2>=0.7.0