diff --git a/neutron/plugins/ml2/drivers/openvswitch/agent/openflow/native/base_oskenapp.py b/neutron/plugins/ml2/drivers/openvswitch/agent/openflow/native/base_oskenapp.py
index 354acb4cac2..1387fe7befc 100644
--- a/neutron/plugins/ml2/drivers/openvswitch/agent/openflow/native/base_oskenapp.py
+++ b/neutron/plugins/ml2/drivers/openvswitch/agent/openflow/native/base_oskenapp.py
@@ -24,7 +24,10 @@
 
 class BaseNeutronAgentOSKenApp(app_manager.OSKenApp):
     OFP_VERSIONS = [ofproto_v1_3.OFP_VERSION]
-    packet_in_handlers = []
+
+    def __init__(self):
+        super().__init__()
+        self.packet_in_handlers = []
 
     def register_packet_in_handler(self, caller):
         self.packet_in_handlers.append(caller)
diff --git a/zuul.d/tempest-singlenode.yaml b/zuul.d/tempest-singlenode.yaml
index a9863a67af1..e656527deb9 100644
--- a/zuul.d/tempest-singlenode.yaml
+++ b/zuul.d/tempest-singlenode.yaml
@@ -702,6 +702,7 @@
         br-ex-tcpdump: true
         br-int-flows: true
       devstack_localrc:
+        TEMPEST_BRANCH: 45.0.0
         TEMPEST_VENV_UPPER_CONSTRAINTS: '/opt/stack/requirements/upper-constraints.txt'
       devstack_local_conf:
         test-config:
@@ -720,6 +721,7 @@
       nslookup_target: 'opendev.org'
       configure_swap_size: 4096
       devstack_localrc:
+        TEMPEST_BRANCH: 45.0.0
         TEMPEST_VENV_UPPER_CONSTRAINTS: '/opt/stack/requirements/upper-constraints.txt'
       devstack_local_conf:
         test-config: