diff --git a/tox.ini b/tox.ini
index c4e69e623b..d6ad086e59 100644
--- a/tox.ini
+++ b/tox.ini
@@ -13,7 +13,7 @@ setenv =
     VIRTUAL_ENV={envdir}
     DISCOVER_DIRECTORY=sahara/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/2023.1}
     -r{toxinidir}/requirements.txt
     -r{toxinidir}/test-requirements.txt
 commands = stestr run {posargs}
@@ -29,7 +29,7 @@ commands = {toxinidir}/tools/cover.sh {posargs}
 
 [testenv:pep8]
 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
   -r{toxinidir}/doc/requirements.txt
@@ -54,7 +54,7 @@ commands = {posargs}
 
 [testenv:docs]
 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}/doc/requirements.txt
 commands =
@@ -68,7 +68,7 @@ allowlist_externals = rm
 
 [testenv:api-ref]
 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}/doc/requirements.txt
 install_command = pip install -U --force-reinstall {opts} {packages}
 commands =
@@ -88,7 +88,7 @@ commands =
 
 [testenv:releasenotes]
 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}/doc/requirements.txt
 commands =
   rm -rf releasenotes/build releasenotes/html