diff --git a/tox.ini b/tox.ini
index 26baa2a1c5..4204670354 100644
--- a/tox.ini
+++ b/tox.ini
@@ -36,7 +36,9 @@ commands = bash -c "find {toxinidir}             \
 
 [testenv:docs]
 basepython = python3
-deps = -r{toxinidir}/doc/requirements.txt
+deps =
+  -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/ussuri}
+  -r{toxinidir}/doc/requirements.txt
 whitelist_externals = bash
 setenv =
   TOP_DIR={toxinidir}