diff --git a/packages/ui-default/backendlib/markdown.js b/packages/ui-default/backendlib/markdown.js
index 3f6f7adc1..8351c1e04 100644
--- a/packages/ui-default/backendlib/markdown.js
+++ b/packages/ui-default/backendlib/markdown.js
@@ -18,6 +18,7 @@ const Footnote = require('markdown-it-footnote');
 const Mark = require('markdown-it-mark');
 const TOC = require('markdown-it-table-of-contents');
 const Anchor = require('markdown-it-anchor');
+const MergeCells = require('markdown-it-merge-cells');
 // @[url](videourl)
 // @[youtube](https://youtube.com/watch?v=xxx)
 // @[pdf](https://foo.com/bar.pdf)
@@ -39,6 +40,7 @@ class Markdown extends MarkdownIt {
     this.use(Anchor);
     this.use(TOC);
     this.use(Katex);
+    this.use(MergeCells);
     this.use(xssProtector);
   }
 }
diff --git a/packages/ui-default/package.json b/packages/ui-default/package.json
index 952d11787..48e1866f7 100644
--- a/packages/ui-default/package.json
+++ b/packages/ui-default/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@hydrooj/ui-default",
-  "version": "4.8.40",
+  "version": "4.8.41",
   "author": "undefined <i@undefined.moe>",
   "license": "AGPL-3.0",
   "main": "hydro.js",
@@ -115,6 +115,7 @@
     "markdown-it-footnote": "^3.0.2",
     "markdown-it-imsize": "^2.0.1",
     "markdown-it-mark": "^3.0.1",
+    "markdown-it-merge-cells": "^1.0.1",
     "markdown-it-table-of-contents": "^0.5.2",
     "nunjucks": "^3.2.3",
     "streamsaver": "^2.0.5",