diff --git a/frontends/dashboard/src/routes/app/instances/[instanceId]/settings/CustomDomain.svelte b/frontends/dashboard/src/routes/app/instances/[instanceId]/settings/CustomDomain.svelte
index cfdd1095..6896a6bf 100644
--- a/frontends/dashboard/src/routes/app/instances/[instanceId]/settings/CustomDomain.svelte
+++ b/frontends/dashboard/src/routes/app/instances/[instanceId]/settings/CustomDomain.svelte
@@ -28,7 +28,7 @@
   let successMessage = ''
 
   const regex =
-    /^(?:[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?\.)+[a-zA-Z]{2,6}$/
+    /^(?:[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?\.)+[a-zA-Z]{2,24}$/
 
   $: {
     isButtonDisabled = !!formCname.trim() && !regex.test(formCname)
diff --git a/src/mothership-app/migrations/1706060446_updated_instances.js b/src/mothership-app/migrations/1706060446_updated_instances.js
new file mode 100644
index 00000000..7599c906
--- /dev/null
+++ b/src/mothership-app/migrations/1706060446_updated_instances.js
@@ -0,0 +1,44 @@
+/// <reference path="../pb_data/types.d.ts" />
+migrate((db) => {
+  const dao = new Dao(db)
+  const collection = dao.findCollectionByNameOrId("etae8tuiaxl6xfv")
+
+  // update
+  collection.schema.addField(new SchemaField({
+    "system": false,
+    "id": "5oz9huwg",
+    "name": "cname",
+    "type": "text",
+    "required": false,
+    "presentable": false,
+    "unique": false,
+    "options": {
+      "min": null,
+      "max": null,
+      "pattern": "^(?:[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?\\.)+[a-zA-Z]{2,24}$"
+    }
+  }))
+
+  return dao.saveCollection(collection)
+}, (db) => {
+  const dao = new Dao(db)
+  const collection = dao.findCollectionByNameOrId("etae8tuiaxl6xfv")
+
+  // update
+  collection.schema.addField(new SchemaField({
+    "system": false,
+    "id": "5oz9huwg",
+    "name": "cname",
+    "type": "text",
+    "required": false,
+    "presentable": false,
+    "unique": false,
+    "options": {
+      "min": null,
+      "max": null,
+      "pattern": "^(?:[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?\\.)+[a-zA-Z]{2,6}$"
+    }
+  }))
+
+  return dao.saveCollection(collection)
+})