diff --git a/requirements.txt b/requirements.txt
index 8b70850..61b4be3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
-lxml >= 3.5.0, < 4
-zeep >= 3.0, < 3.3
+lxml
+zeep
 nose
 mock
 coveralls