diff --git a/tox.ini b/tox.ini
index 807ba02..35c65be 100644
--- a/tox.ini
+++ b/tox.ini
@@ -12,7 +12,8 @@ setenv =
     OS_STDERR_CAPTURE=1
     OS_TEST_TIMEOUT=60
     OS_LOG_CAPTURE=1
-deps = -r{toxinidir}/test-requirements.txt
+deps = -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
+       -r{toxinidir}/test-requirements.txt
        -r{toxinidir}/requirements.txt
 commands = stestr run {posargs}
 basepython = python3