diff --git a/tox.ini b/tox.ini
index ab92c2c1298..c2eb0cbf973 100644
--- a/tox.ini
+++ b/tox.ini
@@ -127,6 +127,7 @@ commands = {posargs}
 [testenv:docs]
 deps =
   -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
+  -r{toxinidir}/requirements.txt
   -r{toxinidir}/doc/requirements.txt
 commands =
   rm -fr doc/source/contributor/api/