diff --git a/tox.ini b/tox.ini
index 174bba98f4..313481b425 100644
--- a/tox.ini
+++ b/tox.ini
@@ -12,7 +12,7 @@ setenv = VIRTUAL_ENV={envdir}
 
 usedevelop = True
 install_command = pip install \
-                  -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master} \
+                  -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/2024.1} \
                   -U {opts} {packages}
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
@@ -26,7 +26,7 @@ allowlist_externals = find
 
 [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/2024.1}
   -r{toxinidir}/test-requirements.txt
 commands =
     flake8
@@ -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/2024.1}
     -r{toxinidir}/doc/requirements.txt
 allowlist_externals = rm
 commands =