diff --git a/tox.ini b/tox.ini
index f5160703..e0e5dcbf 100644
--- a/tox.ini
+++ b/tox.ini
@@ -14,7 +14,7 @@ setenv = OS_STDOUT_NOCAPTURE=False
 # first one that is defined. If none of them is defined, we fallback to the
 # default value.
 deps =
-       -c{env:TOX_CONSTRAINTS_FILE:{env:UPPER_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 = stestr run --slowest {posargs}
@@ -68,7 +68,7 @@ basepython = python3
 # first one that is defined. If none of them is defined, we fallback to the
 # default value.
 deps =
-  -c{env:TOX_CONSTRAINTS_FILE:{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}}
+  -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/2023.1}
   -r{toxinidir}/doc/requirements.txt
 commands =
   sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html