diff --git a/tox.ini b/tox.ini
index 9005d194..990fcdd6 100644
--- a/tox.ini
+++ b/tox.ini
@@ -12,7 +12,7 @@ setenv = VIRTUAL_ENV={envdir}
          PYTHONWARNINGS=default::DeprecationWarning
 usedevelop = True
 install_command = pip install {opts} {packages}
-deps = -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
+deps = -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/zed}
        -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 
@@ -46,7 +46,7 @@ commands =
     coverage report
 
 [testenv:docs]
-deps = -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
+deps = -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/zed}
        -r{toxinidir}/doc/requirements.txt
 commands =
   sphinx-build -a -W -E -b html doc/source doc/build/html