diff --git a/xiaoshi-device-todo-card.js b/xiaoshi-device-todo-card.js
index dfa6d63..1736800 100644
--- a/xiaoshi-device-todo-card.js
+++ b/xiaoshi-device-todo-card.js
@@ -1,3 +1,5 @@
+import { LitElement, html, css } from "https://unpkg.com/lit-element@2.4.0/lit-element.js?module";
+
 class XiaoshiTodoCardEditor extends LitElement {
   static get properties() {
     return {