diff --git a/tox.ini b/tox.ini
index 90eea2ed..bf04ada2 100644
--- a/tox.ini
+++ b/tox.ini
@@ -6,7 +6,7 @@ ignore_basepython_conflict = True
 
 [testenv]
 basepython = python3
-install_command = pip install -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master} {opts} {packages}
+install_command = pip install -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/wallaby} {opts} {packages}
 
 [testenv:releasenotes]
 deps = -r{toxinidir}/doc/requirements.txt