diff --git a/ui/packages/editor/src/extensions/code-block/lowlight.ts b/ui/packages/editor/src/extensions/code-block/lowlight.ts
index 9cc5c37f5..eb1238926 100644
--- a/ui/packages/editor/src/extensions/code-block/lowlight.ts
+++ b/ui/packages/editor/src/extensions/code-block/lowlight.ts
@@ -1,6 +1,8 @@
 import { common, createLowlight } from "lowlight";
 import xml from "highlight.js/lib/languages/xml";
+import dart from "highlight.js/lib/languages/dart";
 
 const lowlight = createLowlight(common);
 lowlight.register("html", xml);
+lowlight.register("dart", dart);
 export default lowlight;