diff --git a/tox.ini b/tox.ini
index e55a69c21..79e9bde15 100644
--- a/tox.ini
+++ b/tox.ini
@@ -31,7 +31,7 @@ commands = stestr run --serial --slowest {posargs}
 
 [testenv:py{3,38,39,310,311}]
 install_command =
-  python -m pip install -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master} {opts} {packages}
+  python -m pip install -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/2024.1} {opts} {packages}
 
 [testenv:pep8]
 commands =
@@ -61,7 +61,7 @@ commands = {posargs}
 
 [testenv:docs]
 install_command =
-    python -m pip install -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master} {opts} {packages}
+    python -m pip install -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/2024.1} {opts} {packages}
 deps =
     -r{toxinidir}/requirements.txt
     -r{toxinidir}/doc/requirements.txt
@@ -75,7 +75,7 @@ commands =
 allowlist_externals = bash
                       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/2024.1}
     -r{toxinidir}/doc/requirements.txt
 commands =
     rm -rf api-ref/build
@@ -86,7 +86,7 @@ commands = oslo_debug_helper {posargs}
 
 [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
 commands =
     doc8 releasenotes/source releasenotes/notes