diff --git a/tox.ini b/tox.ini
index 8791863..bfc7f05 100644
--- a/tox.ini
+++ b/tox.ini
@@ -13,7 +13,7 @@ passenv = *_proxy
           *_PROXY
 usedevelop = True
 install_command =
-    {toxinidir}/tools/tox_install.sh {env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt} {opts} {packages}
+    {toxinidir}/tools/tox_install.sh {env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt?h=stable/pike} {opts} {packages}
 deps = -r{toxinidir}/test-requirements.txt
 whitelist_externals = bash
                       find