diff --git a/tox.ini b/tox.ini
index 9d74cb2..765d98f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -10,7 +10,7 @@
    VIRTUAL_ENV={envdir}
    OS_TEST_PATH=./castellan/tests/unit
 deps =
-       -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt}
+       -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/stein}
        -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 commands = stestr run --slowest {posargs}