diff --git a/tox.ini b/tox.ini
index c99596b..3b7f9d2 100644
--- a/tox.ini
+++ b/tox.ini
@@ -33,7 +33,7 @@ setenv =
 [testenv:docs]
 deps =
     -r{toxinidir}/doc/requirements.txt
-    -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
+    -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/2023.2}
 commands =
     bash -c "rm -rf doc/build"
     doc8 doc
@@ -53,7 +53,7 @@ extensions = .rst
 [testenv:releasenotes]
 deps =
     -r{toxinidir}/doc/requirements.txt
-    -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
+    -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/2023.2}
 commands =
     sphinx-build -a -E -W -d releasenotes/build/doctrees --keep-going -b html releasenotes/source releasenotes/build/html