diff --git a/requirements.txt b/requirements.txt
index 4e3e8db..eb72f18 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,3 @@
 six>=1.3.0
-pbr>=0.8.2,<2.0
+pbr>=0.8.2
 multi_key_dict