diff --git a/tox.ini b/tox.ini
index 44835b23..0f149d36 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,7 +7,7 @@ skipsdist = True
 basepython = python3
 setenv = VIRTUAL_ENV={envdir}
 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}/test-requirements.txt
 passenv = GENERATE_GRENADE_PLUGIN_LIST
 
@@ -21,7 +21,7 @@ commands =
 [testenv:docs]
 allowlist_externals = bash
 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
 setenv =
   TOP_DIR={toxinidir}