diff --git a/tox.ini b/tox.ini
index ee486901..71389910 100644
--- a/tox.ini
+++ b/tox.ini
@@ -9,7 +9,7 @@ usedevelop = True
 setenv =
   PYTHONDONTWRITEBYTECODE=1
 deps =
-  -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
+  -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/2023.1}
   -r{toxinidir}/requirements.txt
   -r{toxinidir}/test-requirements.txt
 commands =
@@ -30,7 +30,7 @@ commands = {posargs}
 # This environment is called from CI scripts to test and publish
 # the API Ref and Docs to docs.openstack.org.
 allowlist_externals = rm
-deps = -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
+deps = -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/2023.1}
        -r{toxinidir}/doc/requirements.txt
 commands =
   rm -rf doc/build