diff --git a/tox.ini b/tox.ini
index 6db14c711..6a55bdf66 100644
--- a/tox.ini
+++ b/tox.ini
@@ -14,7 +14,7 @@ whitelist_externals =
   bash
   rm
   env
-install_command = pip install -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master} {opts} {packages}
+install_command = pip install -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/xena} {opts} {packages}
 setenv =
   VIRTUAL_ENV={envdir}
   LANGUAGE=en_US