diff --git a/tox.ini b/tox.ini
index ef75d18c4..ba9e2db0e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -63,6 +63,7 @@ commands = oslo_debug_helper -t ironic_python_agent/tests/unit {posargs}
 setenv = PYTHONHASHSEED=0
 sitepackages = False
 deps =
+  -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
   -r{toxinidir}/doc/requirements.txt
 commands =
   sphinx-build -b html doc/source doc/build/html
@@ -72,6 +73,7 @@ whitelist_externals = make
 setenv = PYTHONHASHSEED=0
 sitepackages = False
 deps =
+  -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
   -r{toxinidir}/doc/requirements.txt
 commands =
   sphinx-build -b latex doc/source doc/build/pdf