diff --git a/tox.ini b/tox.ini
index 90644f3..1194b80 100644
--- a/tox.ini
+++ b/tox.ini
@@ -14,7 +14,7 @@ whitelist_externals =
   mkdir
   mypy
   rm
-deps = -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
+deps = -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/ussuri}
        -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 passenv = http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY