diff --git a/ansible/group_vars/all.yml b/ansible/group_vars/all.yml
index 907265d8ac..317759a288 100644
--- a/ansible/group_vars/all.yml
+++ b/ansible/group_vars/all.yml
@@ -503,7 +503,7 @@ openstack_logging_debug: "False"
 openstack_region_name: "RegionOne"
 
 # Variable defined the pin_release_version, apply for rolling upgrade process
-openstack_previous_release_name: "train"
+openstack_previous_release_name: "ussuri"
 
 # A list of policy file formats that are supported by Oslo.policy
 supported_policy_format_list:
diff --git a/zuul.d/base.yaml b/zuul.d/base.yaml
index f27ed9d636..6ac0cc215d 100644
--- a/zuul.d/base.yaml
+++ b/zuul.d/base.yaml
@@ -26,7 +26,7 @@
       - ^kolla_ansible/tests/
       - ^zuul\.d/
     vars:
-      previous_release: train
+      previous_release: ussuri
       scenario: core
       is_upgrade: no
       api_network_prefix: "192.0.2."