diff --git a/tox.ini b/tox.ini
index 47adec2..63e1b3f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -6,7 +6,7 @@ skipsdist = True
 [testenv]
 install_command = pip install {opts} {packages}
 deps =
-    -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
+    -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/xena}
     -r{toxinidir}/test-requirements.txt
 
 [testenv:pep8]