diff --git a/tox.ini b/tox.ini
index 34b13e9..0362b12 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,7 +7,7 @@ ignore_basepython_conflict = True
 [testenv]
 basepython = python3
 usedevelop = True
-install_command = {toxinidir}/tools/tox_install.sh {env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master} {opts} {packages}
+install_command = {toxinidir}/tools/tox_install.sh {env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/xena} {opts} {packages}
 deps =
   -r{toxinidir}/requirements.txt
   -r{toxinidir}/test-requirements.txt