diff --git a/tox.ini b/tox.ini
index cd920f8bd..fb84f66a6 100644
--- a/tox.ini
+++ b/tox.ini
@@ -13,7 +13,7 @@ passenv = UPPER_CONSTRAINTS_FILE
 usedevelop = True
 whitelist_externals = rm
 install_command =
-    pip install -U -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master} {opts} {packages}
+    pip install -U -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/train} {opts} {packages}
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 commands =