diff --git a/packages/ui-default/components/monaco/index.ts b/packages/ui-default/components/monaco/index.ts
index 09a1522b6..7b771075c 100644
--- a/packages/ui-default/components/monaco/index.ts
+++ b/packages/ui-default/components/monaco/index.ts
@@ -166,5 +166,6 @@ export function registerAction(
     if (suggestWidget?._setDetailsVisible) suggestWidget._setDetailsVisible(true);
     handlePasteEvent(editor);
   }
-  return loadThemePromise;
+  if (!customOptions.theme) return null;
+  return loadThemePromise.then(() => editor.updateOptions({ theme: customOptions.theme }));
 }
diff --git a/packages/ui-default/package.json b/packages/ui-default/package.json
index 979d34744..a93a525e3 100644
--- a/packages/ui-default/package.json
+++ b/packages/ui-default/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@hydrooj/ui-default",
-  "version": "4.33.7",
+  "version": "4.33.8",
   "author": "undefined <i@undefined.moe>",
   "license": "AGPL-3.0",
   "main": "hydro.js",