diff --git a/package.json b/package.json
index 04f27fec82..fff2ad1e2d 100644
--- a/package.json
+++ b/package.json
@@ -52,6 +52,7 @@
     "jquery": "4.0.0",
     "js-yaml": "4.1.1",
     "katex": "0.16.45",
+    "marked": "18.0.2",
     "mermaid": "11.14.0",
     "online-3d-viewer": "0.18.0",
     "pdfobject": "2.3.1",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index cca57d3b19..147dcccb29 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -166,6 +166,9 @@ importers:
       katex:
         specifier: 0.16.45
         version: 0.16.45
+      marked:
+        specifier: 18.0.2
+        version: 18.0.2
       mermaid:
         specifier: 11.14.0
         version: 11.14.0
@@ -3113,6 +3116,11 @@ packages:
     engines: {node: '>= 20'}
     hasBin: true
 
+  marked@18.0.2:
+    resolution: {integrity: sha512-NsmlUYBS/Zg57rgDWMYdnre6OTj4e+qq/JS2ot3KrYLSoHLw+sDu0Nm1ZGpRgYAq6c+b1ekaY5NzVchMCQnzcg==}
+    engines: {node: '>= 20'}
+    hasBin: true
+
   marked@4.3.0:
     resolution: {integrity: sha512-PRsaiG84bK+AMvxziE/lCFss8juXjNaWzVbN5tXAm4XjeaS9NAHhop+PjQxz2A9h8Q4M/xGmzP8vqNwy6JeK0A==}
     engines: {node: '>= 12'}
@@ -7084,6 +7092,8 @@ snapshots:
 
   marked@16.4.2: {}
 
+  marked@18.0.2: {}
+
   marked@4.3.0: {}
 
   material-icon-theme@5.33.1:
diff --git a/tests/e2e/jupyter-render.test.ts b/tests/e2e/jupyter-render.test.ts
index 20fe6797fe..9528fbd85d 100644
--- a/tests/e2e/jupyter-render.test.ts
+++ b/tests/e2e/jupyter-render.test.ts
@@ -15,7 +15,7 @@ test.describe('jupyter notebook rendering', () => {
     // Single comprehensive test notebook
     const notebook = JSON.stringify({
       cells: [
-        {cell_type: 'markdown', source: ['# Test\n', '**bold**']},
+        {cell_type: 'markdown', source: ['# Header 1\n', '## Header 2\n', '**bold** *italic* `code`\n', '- List item 1\n', '- List item 2\n', '[link](https://example.com)\n', '| Col1 | Col2 |\n', '|------|------|\n', '| A | B |\n', '```python\ncode block\n```\n', '> blockquote\n', '~~strikethrough~~']},
         {cell_type: 'code', execution_count: 1, source: ['print("Hello")'], outputs: [{output_type: 'stream', name: 'stdout', text: ['Hello\n']}]},
         {cell_type: 'code', execution_count: 2, source: ['x'], outputs: [{output_type: 'execute_result', data: {'image/png': 'iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+M9QDwADhgGAWjR9awAAAABJRU5ErkJggg=='}}]},
         {cell_type: 'code', source: ['# No output'], outputs: []},
@@ -32,7 +32,11 @@ test.describe('jupyter notebook rendering', () => {
     await login(page);
     await page.goto(`/${owner}/${repoName}/src/branch/main/test.ipynb`);
     await assertNoJsError(page);
-    await expect(page.frameLocator('iframe.external-render-iframe').locator('.cell.markdown strong')).toBeVisible();
+    const frame = page.frameLocator('iframe.external-render-iframe');
+    await expect(frame.locator('.cell.markdown h1')).toBeVisible();
+    await expect(frame.locator('.cell.markdown strong')).toBeVisible();
+    await expect(frame.locator('.cell.markdown ul li').first()).toBeVisible();
+    await expect(frame.locator('.cell.markdown table')).toBeVisible();
   });
 
   test('renders code cells with outputs', async ({page}) => {
diff --git a/web_src/js/render/plugins/frontend-jupyter-notebook.ts b/web_src/js/render/plugins/frontend-jupyter-notebook.ts
index 7c30f4063c..dfaf87aa94 100644
--- a/web_src/js/render/plugins/frontend-jupyter-notebook.ts
+++ b/web_src/js/render/plugins/frontend-jupyter-notebook.ts
@@ -1,4 +1,5 @@
 import type {FrontendRenderFunc} from '../plugin.ts';
+import {marked} from 'marked';
 import '../../../css/features/jupyter.css';
 
 // Sanitize HTML by removing dangerous attributes and elements
@@ -38,60 +39,14 @@ function sanitizeHtml(element: HTMLElement) {
   }
 }
 
-// Simple markdown to HTML converter for notebook cells using DOM methods
+// Render markdown using marked library
 function renderMarkdown(markdown: string): HTMLElement {
   const container = document.createElement('div');
-
-  // Split by lines and process
-  const lines = markdown.split('\n');
-  for (const line of lines) {
-    let element: HTMLElement;
-
-    // Headers
-    if (line.startsWith('### ')) {
-      element = document.createElement('h3');
-      element.textContent = line.substring(4);
-    } else if (line.startsWith('## ')) {
-      element = document.createElement('h2');
-      element.textContent = line.substring(3);
-    } else if (line.startsWith('# ')) {
-      element = document.createElement('h1');
-      element.textContent = line.substring(2);
-    } else {
-      element = document.createElement('p');
-      // Process inline formatting
-      processInlineFormatting(element, line);
-    }
-
-    container.append(element);
-  }
-
+  container.innerHTML = marked.parse(markdown) as string;
+  sanitizeHtml(container);
   return container;
 }
 
-// Process bold, italic, and inline code
-function processInlineFormatting(element: HTMLElement, text: string) {
-  const parts = text.split(/(\*\*[^*]+\*\*|\*[^*]+\*|`[^`]+`)/);
-
-  for (const part of parts) {
-    if (part.startsWith('**') && part.endsWith('**')) {
-      const strong = document.createElement('strong');
-      strong.textContent = part.slice(2, -2);
-      element.append(strong);
-    } else if (part.startsWith('*') && part.endsWith('*')) {
-      const em = document.createElement('em');
-      em.textContent = part.slice(1, -1);
-      element.append(em);
-    } else if (part.startsWith('`') && part.endsWith('`')) {
-      const code = document.createElement('code');
-      code.textContent = part.slice(1, -1);
-      element.append(code);
-    } else if (part) {
-      element.append(document.createTextNode(part));
-    }
-  }
-}
-
 export const frontendRender: FrontendRenderFunc = async (opts) => {
   try {
     const notebook = JSON.parse(opts.contentString());