diff --git a/tox.ini b/tox.ini
index 4c654c2a..fda5d243 100644
--- a/tox.ini
+++ b/tox.ini
@@ -10,7 +10,7 @@ usedevelop = True
 install_command = pip install -U {opts} {packages}
 setenv =
   VIRTUAL_ENV={envdir}
-  CONSTRAINTS_OPT=-c{env:UPPER_CONSTRAINTS_FILE:https://opendev.org/openstack/requirements/raw/branch/master/upper-constraints.txt}
+  CONSTRAINTS_OPT=-c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
 deps =
   {env:CONSTRAINTS_OPT}
   -r{toxinidir}/requirements.txt