diff --git a/tox.ini b/tox.ini
index fd36af85..99e2b5ea 100644
--- a/tox.ini
+++ b/tox.ini
@@ -10,7 +10,7 @@ setenv =
   OS_STDERR_CAPTURE={env:OS_STDERR_CAPTURE:1}
   OS_TEST_TIMEOUT={env:OS_TEST_TIMEOUT:60}
 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
   -r{toxinidir}/requirements.txt
   -r{toxinidir}/doc/requirements.txt
@@ -42,7 +42,7 @@ commands = {posargs}
 [testenv:docs]
 allowlist_externals = 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 -fr doc/build