diff --git a/tox.ini b/tox.ini
index 3796a54641..b92e5456fd 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,6 +4,7 @@ skipsdist = True
 
 [testenv]
 usedevelop = True
+install_command = pip install -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt} {opts} {packages}
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt