diff --git a/tox.ini b/tox.ini
index 2a56f650..58f3b134 100644
--- a/tox.ini
+++ b/tox.ini
@@ -19,7 +19,7 @@ setenv =
     VIRTUAL_ENV={envdir}
     OS_TEST_PATH=cyborg/tests/unit
 deps =
-  -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
+  -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/2023.2}
   -r{toxinidir}/requirements.txt
   -r{toxinidir}/test-requirements.txt
 
@@ -94,7 +94,7 @@ allowlist_externals =
   sphinx-build
   rm
 deps =
-  -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
+  -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/2023.2}
   -r{toxinidir}/doc/requirements.txt
 commands =
     rm -rf doc/build/html