diff --git a/portal_event_tickets/__manifest__.py b/portal_event_tickets/__manifest__.py
index d3ebccd..65320a1 100644
--- a/portal_event_tickets/__manifest__.py
+++ b/portal_event_tickets/__manifest__.py
@@ -27,7 +27,7 @@
             "/portal_event_tickets/static/src/js/portal.esm.js",
         ],
         "web.assets_tests": [
-            "/portal_event_tickets/static/src/js/ticket_transfer.tour.esm.js",
+            "/portal_event_tickets/static/src/js/*.tour.esm.js",
         ],
     },
     "qweb": [],
diff --git a/portal_event_tickets/static/src/js/ticket_upgrade.tour.esm.js b/portal_event_tickets/static/src/js/ticket_upgrade.tour.esm.js
new file mode 100644
index 0000000..79dcefc
--- /dev/null
+++ b/portal_event_tickets/static/src/js/ticket_upgrade.tour.esm.js
@@ -0,0 +1,58 @@
+/** @odoo-module **/
+
+import {registry} from "@web/core/registry";
+import wsTourUtils from "@website_sale/js/tours/tour_utils";
+
+registry.category("web_tour.tours").add("portal_event_tickets.ticket_upgrade_tour", {
+    test: true,
+    url: "/my/tickets",
+    steps: () => [
+        {
+            content: "Choose first ticket",
+            trigger: "a.ticket-id",
+        },
+        {
+            content: "Click on upgrade ticket",
+            trigger: "a:contains('Upgrade / Change ticket')",
+        },
+        {
+            content: "Confirm upgrade",
+            trigger: ".modal-dialog button[type=submit]",
+        },
+        {
+            content: "Open the register modal",
+            trigger: 'button:contains("Register")',
+        },
+        {
+            content: "Select 1 unit of `VIP` ticket type",
+            extra_trigger:
+                '#wrap:not(:has(a[href*="/event"]:contains("Conference for Architects")))',
+            trigger: "select:eq(1)",
+            run: "text 1",
+        },
+        {
+            content: "Click on `Order Now` button",
+            extra_trigger: "select:eq(1):has(option:contains(1):propSelected)",
+            trigger: '.btn-primary:contains("Register")',
+        },
+        {
+            content: "Fill attendees details",
+            trigger: 'form[id="attendee_registration"] .btn[type=submit]',
+            run: function () {
+                if ($("input[name*='1-email']").val()) {
+                    // Website_event_attendee_fields automatically filled in data
+                    return;
+                }
+                $("input[name*='1-name']").val("Att1");
+                $("input[name*='1-phone']").val("111 111");
+                $("input[name*='1-email']").val("att1@example.com");
+            },
+        },
+        {
+            content: "Validate attendees details",
+            extra_trigger: "input[name*='1-name']",
+            trigger: "button[type=submit]",
+        },
+        wsTourUtils.goToCart({quantity: 2}),
+    ],
+});
diff --git a/portal_event_tickets/tests/test_ticket_upgrade.py b/portal_event_tickets/tests/test_ticket_upgrade.py
new file mode 100644
index 0000000..192cba5
--- /dev/null
+++ b/portal_event_tickets/tests/test_ticket_upgrade.py
@@ -0,0 +1,65 @@
+from datetime import timedelta
+
+from odoo.fields import Datetime
+from odoo.tests.common import tagged
+
+from odoo.addons.base.tests.common import HttpCaseWithUserPortal
+from odoo.addons.website_event_sale.tests.common import TestWebsiteEventSaleCommon
+
+
+@tagged("-at_install", "post_install")
+class TestTicketUpgrade(TestWebsiteEventSaleCommon, HttpCaseWithUserPortal):
+    def setUp(self):
+        super().setUp()
+
+        self.ticket_vip = self.env["event.event.ticket"].create(
+            {
+                "name": "VIP",
+                "event_id": self.event_2.id,
+                "product_id": self.env.ref("event_sale.product_product_event").id,
+                "end_sale_datetime": (Datetime.today() + timedelta(90)).strftime(
+                    "%Y-%m-%d"
+                ),
+                "price": 1500.0,
+            }
+        )
+
+    def test_ticket_upgrade(self):
+        q = self.env["sale.order"].create(
+            {
+                "company_id": self.env.company.id,
+                "partner_id": self.partner_portal.id,
+                "pricelist_id": self.pricelist.id,
+                "order_line": [
+                    (
+                        0,
+                        0,
+                        {
+                            "product_id": self.product_event.id,
+                            "event_id": self.event_2.id,
+                            "event_ticket_id": self.ticket_2.id,
+                        },
+                    )
+                ],
+            }
+        )
+
+        q.action_confirm()
+
+        reg = q.order_line.registration_ids
+        self.assertEqual(len(reg), 1, "Unexpected behavior")
+
+        self.start_tour(
+            "/my/tickets",
+            "portal_event_tickets.ticket_upgrade_tour",
+            login="portal",
+            step_delay=500,
+        )
+
+        q = self.env["sale.order"].search([], order="id DESC", limit=1)
+        q.action_confirm()
+
+        new_reg = q.order_line.registration_ids
+        self.assertEqual(len(new_reg), 1, "Unexpected behavior")
+        self.assertEqual(reg.state, "cancel")
+        self.assertEqual(new_reg.state, "open")