diff --git a/tox.ini b/tox.ini
index 5fad5b26..c4c2e4be 100644
--- a/tox.ini
+++ b/tox.ini
@@ -22,7 +22,7 @@ passenv =
     FREEZER_TEST_NO_LVM
     http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY
 
-install_command = pip install -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt} {opts} {packages}
+install_command = pip install -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt?h=stable/pike} {opts} {packages}
 setenv = VIRTUAL_ENV={envdir}
 
 whitelist_externals =