diff --git a/tox.ini b/tox.ini
index 2cc7023..b7b67d8 100644
--- a/tox.ini
+++ b/tox.ini
@@ -18,7 +18,9 @@ commands = bash -c 'if [ ! -d ./.testrepository ] ; then testr init ; fi'
 commands = flake8
 
 [testenv:docs]
-deps = -r{toxinidir}/doc/requirements.txt
+deps =
+    -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
+    -r{toxinidir}/doc/requirements.txt
 commands = sphinx-build -W -b html doc/source doc/build/html
 
 [testenv:venv]
@@ -30,7 +32,9 @@ builtins = _
 exclude=.venv,.git,.tox,*lib/python*,private,.eggs
 
 [testenv:releasenotes]
-deps = -r{toxinidir}/doc/requirements.txt
+deps =
+    -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
+    -r{toxinidir}/doc/requirements.txt
 commands = sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
 [testenv:lower-constraints]