diff --git a/tox.ini b/tox.ini
index dabf696..f2ce3d4 100644
--- a/tox.ini
+++ b/tox.ini
@@ -10,7 +10,7 @@ usedevelop = True
 setenv =
    VIRTUAL_ENV={envdir}
 deps =
-       -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
+       -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/2023.2}
        -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 commands = stestr run --slowest {posargs}