1 files changed, 1 insertions, 1 deletions
diff --git a/tox.ini b/tox.ini
index b74caf5f2..6e36af221 100644
--- a/tox.ini
+++ b/tox.ini
@@ -6,7 +6,7 @@ envlist = py34,py27,pep8
 [testenv]
 usedevelop = True
 install_command =
-                  constraints: pip install -U --force-reinstall -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt} {opts} {packages}
+                  constraints: pip install -U --force-reinstall -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt?h=stable/mitaka} {opts} {packages}
                   pip install -U {opts} {packages}
 setenv = VIRTUAL_ENV={envdir}
          PYTHONDONTWRITEBYTECODE = 1