diff --git a/package-lock.json b/package-lock.json
index 4a5aa42..df5ea15 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,7 +12,7 @@
         "express": "^4.21.0",
         "express-rate-limit": "^7.5.0",
         "helmet": "^8.0.0",
-        "marked": "^15.0.0",
+        "marked": "^17.0.4",
         "nanoid": "^5.0.0",
         "nodemailer": "^8.0.2",
         "pg": "^8.20.0",
@@ -2953,15 +2953,15 @@
       }
     },
     "node_modules/marked": {
-      "version": "15.0.12",
-      "resolved": "https://registry.npmjs.org/marked/-/marked-15.0.12.tgz",
-      "integrity": "sha512-8dD6FusOQSrpv9Z1rdNMdlSgQOIP880DHqnohobOmYLElGEqAL/JvxvuxZO16r4HtjTlfPRDC1hbvxC9dPN2nA==",
+      "version": "17.0.4",
+      "resolved": "https://registry.npmjs.org/marked/-/marked-17.0.4.tgz",
+      "integrity": "sha512-NOmVMM+KAokHMvjWmC5N/ZOvgmSWuqJB8FoYI019j4ogb/PeRMKoKIjReZ2w3376kkA8dSJIP8uD993Kxc0iRQ==",
       "license": "MIT",
       "bin": {
         "marked": "bin/marked.js"
       },
       "engines": {
-        "node": ">= 18"
+        "node": ">= 20"
       }
     },
     "node_modules/math-intrinsics": {
diff --git a/package.json b/package.json
index 7192b22..0d4e047 100644
--- a/package.json
+++ b/package.json
@@ -16,7 +16,7 @@
     "express": "^4.21.0",
     "express-rate-limit": "^7.5.0",
     "helmet": "^8.0.0",
-    "marked": "^15.0.0",
+    "marked": "^17.0.4",
     "nanoid": "^5.0.0",
     "nodemailer": "^8.0.2",
     "pg": "^8.20.0",
diff --git a/src/__tests__/markdown-lists.test.ts b/src/__tests__/markdown-lists.test.ts
new file mode 100644
index 0000000..4d50334
--- /dev/null
+++ b/src/__tests__/markdown-lists.test.ts
@@ -0,0 +1,111 @@
+import { describe, it, expect } from "vitest";
+import { marked } from "marked";
+
+/** Tests for marked list rendering — covering v17 breaking changes */
+describe("Markdown list rendering", () => {
+  const parse = (md: string) => marked.parse(md, { async: false }) as string;
+
+  describe("loose lists (paragraphs inside list items)", () => {
+    it("renders loose list items with <p> tags", () => {
+      const md = `- Item one\n\n- Item two\n\n- Item three\n`;
+      const html = parse(md);
+      expect(html).toContain("<ul>");
+      expect(html).toContain("<li>");
+      // Loose lists wrap content in <p>
+      expect(html).toContain("<p>Item one</p>");
+      expect(html).toContain("<p>Item two</p>");
+      expect(html).toContain("<p>Item three</p>");
+    });
+
+    it("renders tight list items without <p> tags", () => {
+      const md = `- Item one\n- Item two\n- Item three\n`;
+      const html = parse(md);
+      expect(html).toContain("<ul>");
+      expect(html).not.toContain("<p>");
+      expect(html).toContain("Item one");
+    });
+  });
+
+  describe("checkbox/task lists", () => {
+    it("renders unchecked checkboxes", () => {
+      const md = `- [ ] Todo item\n`;
+      const html = parse(md);
+      expect(html).toContain('<input');
+      expect(html).toContain('type="checkbox"');
+      expect(html).not.toContain("checked");
+      expect(html).toContain("Todo item");
+    });
+
+    it("renders checked checkboxes", () => {
+      const md = `- [x] Done item\n`;
+      const html = parse(md);
+      expect(html).toContain('checked');
+      expect(html).toContain("Done item");
+    });
+
+    it("renders mixed task list", () => {
+      const md = `- [x] Done\n- [ ] Pending\n- Regular item\n`;
+      const html = parse(md);
+      expect(html).toContain("Done");
+      expect(html).toContain("Pending");
+      expect(html).toContain("Regular item");
+      // Should have exactly 2 checkboxes
+      const checkboxCount = (html.match(/type="checkbox"/g) || []).length;
+      expect(checkboxCount).toBe(2);
+    });
+  });
+
+  describe("nested lists", () => {
+    it("renders nested unordered lists", () => {
+      const md = `- Parent\n  - Child\n    - Grandchild\n`;
+      const html = parse(md);
+      expect(html).toContain("Parent");
+      expect(html).toContain("Child");
+      expect(html).toContain("Grandchild");
+      // Should have nested <ul> elements
+      const ulCount = (html.match(/<ul>/g) || []).length;
+      expect(ulCount).toBeGreaterThanOrEqual(2);
+    });
+
+    it("renders nested ordered lists", () => {
+      const md = `1. First\n   1. Sub-first\n   2. Sub-second\n2. Second\n`;
+      const html = parse(md);
+      expect(html).toContain("<ol>");
+      expect(html).toContain("First");
+      expect(html).toContain("Sub-first");
+      expect(html).toContain("Second");
+    });
+  });
+
+  describe("mixed list content", () => {
+    it("renders code blocks inside list items", () => {
+      const md = [
+        "- Item with code:",
+        "",
+        "  ```js",
+        "  console.log(\"hi\");",
+        "  ```",
+        "",
+        "- Normal item",
+        "",
+      ].join("\n");
+      const html = parse(md);
+      expect(html).toContain("console.log(&quot;hi&quot;);");
+      expect(html).toContain("Normal item");
+    });
+
+    it("renders inline code in list items", () => {
+      const md = `- Use \`npm install\`\n- Run \`npm test\`\n`;
+      const html = parse(md);
+      expect(html).toContain("<code>npm install</code>");
+      expect(html).toContain("<code>npm test</code>");
+    });
+
+    it("renders bold and italic in list items", () => {
+      const md = `- **Bold item**\n- *Italic item*\n`;
+      const html = parse(md);
+      expect(html).toContain("<strong>Bold item</strong>");
+      expect(html).toContain("<em>Italic item</em>");
+    });
+  });
+});