1 files changed, 3 insertions, 1 deletions
diff --git a/tox.ini b/tox.ini
index 2e79a80c..9c6477c8 100644
--- a/tox.ini
+++ b/tox.ini
@@ -44,7 +44,9 @@ commands = sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasen
 commands = oslo-config-generator --config-file=etc/ceilometer/ceilometer-config-generator.conf
 
 [testenv:docs]
-deps = -r{toxinidir}/doc/requirements.txt
+deps =
+  -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
+  -r{toxinidir}/doc/requirements.txt
 commands = sphinx-build -b html doc/source doc/build/html
 setenv = PYTHONHASHSEED=0