diff --git a/tools/tox_install.sh b/tools/tox_install.sh
index c76227ec..5af322b8 100755
--- a/tools/tox_install.sh
+++ b/tools/tox_install.sh
@@ -10,7 +10,7 @@
 
 ZUUL_CLONER=/usr/zuul-env/bin/zuul-cloner
 neutron_installed=$(echo "import neutron" | python 2>/dev/null ; echo $?)
-BRANCH_NAME=master
+BRANCH_NAME=stable/newton
 
 set -e
 
diff --git a/tox.ini b/tox.ini
index f7c5a213..087fcf16 100644
--- a/tox.ini
+++ b/tox.ini
@@ -8,7 +8,7 @@ setenv = VIRTUAL_ENV={envdir}
          PYTHONWARNINGS=default::DeprecationWarning
 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/newton} {opts} {packages}
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 whitelist_externals =