diff --git a/tox.ini b/tox.ini
index 750b482..b09a9a9 100644
--- a/tox.ini
+++ b/tox.ini
@@ -83,13 +83,13 @@ whitelist_externals = {[testenv:functional]whitelist_externals}
 # Not reusing doc's env due to https://github.com/tox-dev/tox/issues/477
 # envdir = {toxworkdir}/docs
 deps =
-  -c{env:UPPER_CONSTRAINTS_FILE:https://opendev.org/openstack/requirements/raw/branch/master/upper-constraints.txt}
+  -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/ussuri}
   -r{toxinidir}/doc/requirements.txt
 commands = sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
 [testenv:docs]
 deps =
-  -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
+  -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/ussuri}
   -r{toxinidir}/doc/requirements.txt
 commands =
   doc8 --ignore D001 --ignore-path .tox --ignore-path *.egg-info --ignore-path doc/build --ignore-path .eggs/*/EGG-INFO/*.txt -e txt -e rst