diff --git a/package.json b/package.json
index 5f755b4..fb4789e 100644
--- a/package.json
+++ b/package.json
@@ -9,7 +9,7 @@
   },
   "scripts": {
     "start": "vite",
-    "build": "node ../scripts/generate-update-manifest.mjs && vite build",
+    "build": "node scripts/generate-update-manifest.mjs && vite build",
     "lint": "yarn check:eslint && yarn check:prettier",
     "check:eslint": "eslint src/*",
     "check:prettier": "prettier --check .",
diff --git a/scripts/generate-update-manifest.mjs b/scripts/generate-update-manifest.mjs
new file mode 100644
index 0000000..aeb44fa
--- /dev/null
+++ b/scripts/generate-update-manifest.mjs
@@ -0,0 +1,114 @@
+#!/usr/bin/env node
+/**
+ * Regenerates public/update/manifest.json from markdown files.
+ *
+ * - currentupdate.md is always the "current" entry
+ * - Other *.md files matching X.Y.Z.md become "older" (sorted newest first)
+ * - title, date, version come from YAML frontmatter when present
+ */
+
+import fs from 'fs';
+import path from 'path';
+import { fileURLToPath } from 'url';
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+const ROOT = path.resolve(__dirname, '..');
+const UPDATE_DIR = path.join(ROOT, 'public', 'update');
+const MANIFEST_PATH = path.join(UPDATE_DIR, 'manifest.json');
+const CURRENT_FILE = 'currentupdate.md';
+const VERSION_FILE_RE = /^(\d+\.\d+\.\d+)\.md$/;
+
+const FRONTMATTER_RE = /^---\r?\n([\s\S]*?)\r?\n---\r?\n?/;
+
+function parseFrontmatter(source) {
+  const match = FRONTMATTER_RE.exec(source.trimStart());
+  if (!match) return {};
+
+  const frontmatter = {};
+  match[1].split('\n').forEach((line) => {
+    const colon = line.indexOf(':');
+    if (colon <= 0) return;
+    const key = line.slice(0, colon).trim();
+    const raw = line.slice(colon + 1).trim();
+    frontmatter[key] = raw.replace(/^['"]|['"]$/g, '');
+  });
+  return frontmatter;
+}
+
+function compareVersions(a, b) {
+  const pa = a.split('.').map((part) => Number.parseInt(part, 10));
+  const pb = b.split('.').map((part) => Number.parseInt(part, 10));
+  const len = Math.max(pa.length, pb.length);
+
+  for (let i = 0; i < len; i += 1) {
+    const na = pa[i] ?? 0;
+    const nb = pb[i] ?? 0;
+    if (na !== nb) return nb - na;
+  }
+  return 0;
+}
+
+function readMarkdownMeta(fileName) {
+  const filePath = path.join(UPDATE_DIR, fileName);
+  const source = fs.readFileSync(filePath, 'utf8');
+  const frontmatter = parseFrontmatter(source);
+  const versionFromName = VERSION_FILE_RE.exec(fileName)?.[1];
+
+  return {
+    file: fileName,
+    version: frontmatter.version ?? versionFromName,
+    title: frontmatter.title,
+    date: frontmatter.date,
+  };
+}
+
+function buildManifest() {
+  if (!fs.existsSync(UPDATE_DIR)) {
+    throw new Error(`Update directory not found: ${UPDATE_DIR}`);
+  }
+
+  const currentPath = path.join(UPDATE_DIR, CURRENT_FILE);
+  if (!fs.existsSync(currentPath)) {
+    throw new Error(`Missing ${CURRENT_FILE} in ${UPDATE_DIR}`);
+  }
+
+  const older = fs
+    .readdirSync(UPDATE_DIR, { withFileTypes: true })
+    .filter((entry) => entry.isFile() && VERSION_FILE_RE.test(entry.name))
+    .map((entry) => readMarkdownMeta(entry.name))
+    .filter((entry) => entry.version)
+    .sort((a, b) => compareVersions(a.version, b.version));
+
+  return {
+    current: CURRENT_FILE,
+    older: older.map(({ file, version, title, date }) => {
+      const item = { file };
+      if (version) item.version = version;
+      if (title) item.title = title;
+      if (date) item.date = date;
+      return item;
+    }),
+  };
+}
+
+function main() {
+  const manifest = buildManifest();
+  const json = `${JSON.stringify(manifest, null, 2)}\n`;
+
+  let previous = null;
+  if (fs.existsSync(MANIFEST_PATH)) {
+    previous = fs.readFileSync(MANIFEST_PATH, 'utf8');
+  }
+
+  if (previous === json) {
+    console.log('[update-manifest] manifest.json is already up to date');
+    return;
+  }
+
+  fs.writeFileSync(MANIFEST_PATH, json, 'utf8');
+  console.log(
+    `[update-manifest] wrote manifest.json (${manifest.older.length} older version(s))`
+  );
+}
+
+main();