diff --git a/tox.ini b/tox.ini
index a3687e16b..0bbf03398 100644
--- a/tox.ini
+++ b/tox.ini
@@ -11,7 +11,7 @@ setenv = VIRTUAL_ENV={envdir}
          TESTS_DIR=./ironicclient/tests/unit
 usedevelop = True
 deps =
-    -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
+    -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/2025.1}
     -r{toxinidir}/requirements.txt
     -r{toxinidir}/test-requirements.txt
 commands =
@@ -19,7 +19,7 @@ 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/2025.1}
     -r{toxinidir}/doc/requirements.txt
 commands = sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
@@ -30,7 +30,7 @@ deps =
     flake8-import-order>=0.17.1 # LGPLv3
     pycodestyle>=2.0.0,<3.0.0 # MIT
     Pygments>=2.2.0 # BSD
-    -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
+    -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/2025.1}
 commands =
     flake8 {posargs}
     doc8 doc/source CONTRIBUTING.rst README.rst
@@ -47,7 +47,7 @@ commands =
 
 [testenv:venv]
 deps =
-    -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
+    -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/2025.1}
     -r{toxinidir}/test-requirements.txt
     -r{toxinidir}/requirements.txt
     -r{toxinidir}/doc/requirements.txt
@@ -55,7 +55,7 @@ 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/2025.1}
     -r{toxinidir}/doc/requirements.txt
 commands =
     sphinx-build -W -b html doc/source doc/build/html