diff --git a/tox.ini b/tox.ini
index 37f48b4..a110669 100644
--- a/tox.ini
+++ b/tox.ini
@@ -74,8 +74,6 @@ application-import-names = observabilityclient
 
 [testenv:releasenotes]
 deps =
+  -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
   -r{toxinidir}/doc/requirements.txt
-  -r{toxinidir}/requirements.txt
-allowlist_externals =
-  sphinx-build
 commands = sphinx-build -a -E -W -d releasenotes/build/doctrees --keep-going -b html releasenotes/source releasenotes/build/html