diff --git a/.gitreview b/.gitreview
index 19b5cb4..e312782 100644
--- a/.gitreview
+++ b/.gitreview
@@ -2,3 +2,4 @@
 host=review.opendev.org
 port=29418
 project=openstack/puppet-openstacklib.git
+defaultbranch=stable/2026.1
diff --git a/tox.ini b/tox.ini
index 7070f7d..527872c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,6 +3,6 @@ minversion = 3.1
 envlist = releasenotes
 
 [testenv:releasenotes]
-deps = -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
+deps = -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/2026.1}
        -r{toxinidir}/doc/requirements.txt
 commands = sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html