diff --git a/packaging/mac-client/Resources/Info.plist b/packaging/mac-client/Resources/Info.plist
index fa80e4a..5f3afee 100644
--- a/packaging/mac-client/Resources/Info.plist
+++ b/packaging/mac-client/Resources/Info.plist
@@ -17,9 +17,9 @@
     <key>CFBundlePackageType</key>
     <string>APPL</string>
     <key>CFBundleShortVersionString</key>
-    <string>0.9.0</string>
+    <string>0.10.0</string>
     <key>CFBundleVersion</key>
-    <string>0.9.0</string>
+    <string>0.10.0</string>
     <key>CFBundleIconFile</key>
     <string>AppIcon</string>
     <key>LSMinimumSystemVersion</key>
diff --git a/packaging/mac-client/Sources/Lisa/AboutWindow.swift b/packaging/mac-client/Sources/Lisa/AboutWindow.swift
new file mode 100644
index 0000000..277b965
--- /dev/null
+++ b/packaging/mac-client/Sources/Lisa/AboutWindow.swift
@@ -0,0 +1,169 @@
+//
+//  AboutWindow.swift
+//  Lisa
+//
+//  Custom About window (replaces the standard about panel) so it can host the
+//  update affordances the standard panel can't: a "Changelog" link to
+//  meetlisa.ai and an in-place "Check for Updates" → "Download" flow.
+//
+
+import AppKit
+
+final class AboutWindowController: NSWindowController {
+    static let shared = AboutWindowController()
+
+    private let statusLabel = NSTextField(labelWithString: "")
+    private lazy var checkButton = NSButton(title: "Check for Updates", target: self, action: #selector(checkForUpdates))
+    private lazy var downloadButton = NSButton(title: "Download", target: self, action: #selector(downloadUpdate))
+    private var pendingDownloadURL: URL?
+
+    private convenience init() {
+        let win = NSWindow(
+            contentRect: NSRect(x: 0, y: 0, width: 380, height: 360),
+            styleMask: [.titled, .closable, .fullSizeContentView],
+            backing: .buffered,
+            defer: false
+        )
+        win.titleVisibility = .hidden
+        win.titlebarAppearsTransparent = true
+        win.isMovableByWindowBackground = true
+        win.isReleasedWhenClosed = false
+        self.init(window: win)
+        win.contentView = buildContent()
+        win.center()
+    }
+
+    /// Show the About window in its resting state (manual check ready).
+    func show() {
+        statusLabel.stringValue = ""
+        downloadButton.isHidden = true
+        pendingDownloadURL = nil
+        showWindow(nil)
+        window?.center()
+        NSApp.activate(ignoringOtherApps: true)
+    }
+
+    /// Show it already presenting a discovered update (from launch discovery).
+    func show(update: UpdateInfo) {
+        show()
+        present(update)
+    }
+
+    // MARK: - layout
+
+    private func buildContent() -> NSView {
+        let icon = NSImageView(image: NSApp.applicationIconImage ?? NSImage())
+        icon.imageScaling = .scaleProportionallyUpOrDown
+        icon.translatesAutoresizingMaskIntoConstraints = false
+        icon.widthAnchor.constraint(equalToConstant: 96).isActive = true
+        icon.heightAnchor.constraint(equalToConstant: 96).isActive = true
+
+        let name = NSTextField(labelWithString: "Lisa")
+        name.font = .systemFont(ofSize: 22, weight: .bold)
+        name.alignment = .center
+
+        let version = NSTextField(labelWithString: "Version \(Updater.shared.currentVersion)")
+        version.font = .systemFont(ofSize: 12)
+        version.textColor = .secondaryLabelColor
+        version.alignment = .center
+
+        let license = linkButton("MIT — github.com/oratis/LISA",
+                                 url: URL(string: "https://github.com/oratis/LISA")!)
+
+        statusLabel.font = .systemFont(ofSize: 11)
+        statusLabel.textColor = .secondaryLabelColor
+        statusLabel.alignment = .center
+        statusLabel.maximumNumberOfLines = 3
+        statusLabel.lineBreakMode = .byWordWrapping
+        statusLabel.preferredMaxLayoutWidth = 320
+
+        let changelog = NSButton(title: "Changelog", target: self, action: #selector(openChangelog))
+        changelog.bezelStyle = .rounded
+        checkButton.bezelStyle = .rounded
+        downloadButton.bezelStyle = .rounded
+        downloadButton.isHidden = true
+
+        let buttonRow = NSStackView(views: [changelog, checkButton])
+        buttonRow.orientation = .horizontal
+        buttonRow.spacing = 12
+
+        let stack = NSStackView(views: [icon, name, version, license, statusLabel, downloadButton, buttonRow])
+        stack.orientation = .vertical
+        stack.alignment = .centerX
+        stack.spacing = 8
+        stack.setCustomSpacing(14, after: icon)
+        stack.setCustomSpacing(16, after: license)
+        stack.setCustomSpacing(14, after: statusLabel)
+        stack.translatesAutoresizingMaskIntoConstraints = false
+
+        let container = NSView()
+        container.addSubview(stack)
+        NSLayoutConstraint.activate([
+            stack.centerXAnchor.constraint(equalTo: container.centerXAnchor),
+            stack.centerYAnchor.constraint(equalTo: container.centerYAnchor),
+            stack.leadingAnchor.constraint(greaterThanOrEqualTo: container.leadingAnchor, constant: 24),
+            stack.trailingAnchor.constraint(lessThanOrEqualTo: container.trailingAnchor, constant: -24),
+        ])
+        return container
+    }
+
+    /// A borderless button styled as a hyperlink (reliable + accessible vs. a
+    /// gesture-recognized label).
+    private func linkButton(_ text: String, url: URL) -> NSButton {
+        let b = NSButton(title: text, target: self, action: #selector(openLink(_:)))
+        b.isBordered = false
+        b.bezelStyle = .inline
+        b.contentTintColor = .linkColor
+        b.attributedTitle = NSAttributedString(string: text, attributes: [
+            .foregroundColor: NSColor.linkColor,
+            .font: NSFont.systemFont(ofSize: 11),
+        ])
+        b.toolTip = url.absoluteString
+        linkURLs[ObjectIdentifier(b)] = url
+        return b
+    }
+    private var linkURLs: [ObjectIdentifier: URL] = [:]
+
+    // MARK: - actions
+
+    @objc private func openLink(_ sender: NSButton) {
+        if let u = linkURLs[ObjectIdentifier(sender)] { NSWorkspace.shared.open(u) }
+    }
+
+    @objc private func openChangelog() {
+        NSWorkspace.shared.open(Updater.changelogURL)
+    }
+
+    @objc private func downloadUpdate() {
+        if let u = pendingDownloadURL { NSWorkspace.shared.open(u) }
+    }
+
+    @objc func checkForUpdates() {
+        checkButton.isEnabled = false
+        downloadButton.isHidden = true
+        statusLabel.textColor = .secondaryLabelColor
+        statusLabel.stringValue = "Checking for updates…"
+        Updater.shared.check { [weak self] result in
+            guard let self = self else { return }
+            self.checkButton.isEnabled = true
+            switch result {
+            case .upToDate(let current):
+                self.statusLabel.textColor = .secondaryLabelColor
+                self.statusLabel.stringValue = "You're on the latest version (\(current))."
+            case .available(let info):
+                self.present(info)
+            case .failed(let why):
+                self.statusLabel.textColor = .secondaryLabelColor
+                self.statusLabel.stringValue = "Update check failed: \(why)"
+            }
+        }
+    }
+
+    private func present(_ info: UpdateInfo) {
+        statusLabel.textColor = .controlAccentColor
+        statusLabel.stringValue = "Update available: \(info.tag)  (you have \(Updater.shared.currentVersion))"
+        pendingDownloadURL = info.downloadURL
+        downloadButton.title = "Download \(info.tag)"
+        downloadButton.isHidden = false
+    }
+}
diff --git a/packaging/mac-client/Sources/Lisa/AppDelegate.swift b/packaging/mac-client/Sources/Lisa/AppDelegate.swift
index 4f6d7b4..2867a00 100644
--- a/packaging/mac-client/Sources/Lisa/AppDelegate.swift
+++ b/packaging/mac-client/Sources/Lisa/AppDelegate.swift
@@ -26,6 +26,13 @@ final class AppDelegate: NSObject, NSApplicationDelegate {
         installMenu()
         showMainWindow()
 
+        // Quiet update discovery — throttled to once/day and surfaced at most
+        // once per version, so it never nags. Only fires when a newer GitHub
+        // release exists than this bundle's version.
+        Updater.shared.discoverInBackground { [weak self] info in
+            self?.presentUpdatePrompt(info)
+        }
+
         // Phase 3.5 — menu bar mirror of Claude Code activity.
         // Click the status item to bring the main window to front.
         MenuBarController.shared.install { [weak self] in
@@ -137,6 +144,33 @@ final class AppDelegate: NSObject, NSApplicationDelegate {
         mainWindow?.reload()
     }
 
+    // MARK: - About / Updates
+
+    @objc func showAbout(_ sender: Any?) {
+        AboutWindowController.shared.show()
+    }
+
+    @objc func checkForUpdatesMenu(_ sender: Any?) {
+        AboutWindowController.shared.show()
+        AboutWindowController.shared.checkForUpdates()
+    }
+
+    /// A gentle, once-per-version prompt when launch discovery finds a newer
+    /// release. Download installs the notarized DMG (Gatekeeper verifies it).
+    private func presentUpdatePrompt(_ info: UpdateInfo) {
+        let alert = NSAlert()
+        alert.messageText = "Lisa \(info.tag) is available"
+        alert.informativeText = "You have \(Updater.shared.currentVersion). Download the new version, or see what changed."
+        alert.addButton(withTitle: "Download")
+        alert.addButton(withTitle: "Changelog")
+        alert.addButton(withTitle: "Later")
+        switch alert.runModal() {
+        case .alertFirstButtonReturn: NSWorkspace.shared.open(info.downloadURL)
+        case .alertSecondButtonReturn: NSWorkspace.shared.open(Updater.changelogURL)
+        default: break
+        }
+    }
+
     // MARK: - Settings
 
     @objc func openPreferences(_ sender: Any?) {
@@ -156,11 +190,20 @@ final class AppDelegate: NSObject, NSApplicationDelegate {
         // ── App menu ────────────────────────────────────────────────
         let appMenuItem = NSMenuItem()
         let appMenu = NSMenu()
-        appMenu.addItem(NSMenuItem(
+        let aboutItem = NSMenuItem(
             title: "About Lisa",
-            action: #selector(NSApplication.orderFrontStandardAboutPanel(_:)),
+            action: #selector(showAbout(_:)),
             keyEquivalent: ""
-        ))
+        )
+        aboutItem.target = self
+        appMenu.addItem(aboutItem)
+        let updatesItem = NSMenuItem(
+            title: "Check for Updates…",
+            action: #selector(checkForUpdatesMenu(_:)),
+            keyEquivalent: ""
+        )
+        updatesItem.target = self
+        appMenu.addItem(updatesItem)
         appMenu.addItem(.separator())
         let settingsItem = NSMenuItem(
             title: "Settings…",
diff --git a/packaging/mac-client/Sources/Lisa/Updater.swift b/packaging/mac-client/Sources/Lisa/Updater.swift
new file mode 100644
index 0000000..2bfaa37
--- /dev/null
+++ b/packaging/mac-client/Sources/Lisa/Updater.swift
@@ -0,0 +1,130 @@
+//
+//  Updater.swift
+//  Lisa
+//
+//  Lightweight, dependency-free update discovery. Asks the GitHub Releases API
+//  for the latest tag, compares it to this bundle's version, and — when newer —
+//  hands back the signed/notarized DMG asset (or the release page) to download.
+//
+//  This is deliberately NOT a Sparkle-style in-place auto-updater: it discovers
+//  + opens the download, and Gatekeeper verifies the notarized DMG on install.
+//  (A one-click in-place update would mean fetching + executing a new app
+//  binary ourselves — the exact RCE surface we don't want to hand-roll.)
+//
+
+import AppKit
+
+/// A newer release worth offering.
+struct UpdateInfo {
+    let version: String   // "0.11.0"
+    let tag: String       // "v0.11.0"
+    let downloadURL: URL  // DMG asset, else the release page
+    let notes: String     // release body (may be empty)
+}
+
+enum UpdateCheckResult {
+    case upToDate(current: String)
+    case available(UpdateInfo)
+    case failed(String)
+}
+
+final class Updater {
+    static let shared = Updater()
+    private init() {}
+
+    /// Where the "Changelog" button goes — the branded page on the product site.
+    static let changelogURL = URL(string: "https://meetlisa.ai/changelog")!
+    /// Fallback when a release carries no DMG asset.
+    static let releasesPage = URL(string: "https://github.com/oratis/LISA/releases/latest")!
+
+    private let releasesAPI = URL(string: "https://api.github.com/repos/oratis/LISA/releases/latest")!
+    private let lastCheckKey = "ai.meetlisa.updater.lastCheck"
+    private let lastNotifiedKey = "ai.meetlisa.updater.lastNotifiedVersion"
+
+    /// This bundle's marketing version (stamped from package.json at build time).
+    var currentVersion: String {
+        (Bundle.main.infoDictionary?["CFBundleShortVersionString"] as? String) ?? "0.0.0"
+    }
+
+    /// Active check (from the About window / menu). Completion on the main thread.
+    func check(completion: @escaping (UpdateCheckResult) -> Void) {
+        var req = URLRequest(url: releasesAPI)
+        req.setValue("application/vnd.github+json", forHTTPHeaderField: "Accept")
+        req.timeoutInterval = 12
+        let finish: (UpdateCheckResult) -> Void = { r in DispatchQueue.main.async { completion(r) } }
+
+        URLSession.shared.dataTask(with: req) { [weak self] data, _, err in
+            guard let self else { return }
+            if let err = err { finish(.failed(err.localizedDescription)); return }
+            guard let data = data,
+                  let json = (try? JSONSerialization.jsonObject(with: data)) as? [String: Any],
+                  let tag = json["tag_name"] as? String
+            else { finish(.failed("Couldn't read the latest release.")); return }
+
+            UserDefaults.standard.set(Date().timeIntervalSince1970, forKey: self.lastCheckKey)
+            let latest = Self.stripV(tag)
+            if Self.isNewer(latest, than: self.currentVersion) {
+                let info = UpdateInfo(
+                    version: latest,
+                    tag: tag,
+                    downloadURL: Self.dmgAsset(from: json) ?? Self.htmlURL(json) ?? Self.releasesPage,
+                    notes: (json["body"] as? String) ?? ""
+                )
+                finish(.available(info))
+            } else {
+                finish(.upToDate(current: self.currentVersion))
+            }
+        }.resume()
+    }
+
+    /// Silent launch discovery: throttled to once/day, and only surfaces a given
+    /// version ONCE (never nags about the same release every launch).
+    func discoverInBackground(onNew: @escaping (UpdateInfo) -> Void) {
+        let last = UserDefaults.standard.double(forKey: lastCheckKey)
+        if last > Date().timeIntervalSince1970 - 24 * 60 * 60 { return }
+        check { [weak self] result in
+            guard let self, case .available(let info) = result else { return }
+            if UserDefaults.standard.string(forKey: self.lastNotifiedKey) == info.version { return }
+            UserDefaults.standard.set(info.version, forKey: self.lastNotifiedKey)
+            onNew(info)
+        }
+    }
+
+    // MARK: - helpers
+
+    private static func stripV(_ tag: String) -> String {
+        tag.hasPrefix("v") ? String(tag.dropFirst()) : tag
+    }
+
+    private static func htmlURL(_ json: [String: Any]) -> URL? {
+        (json["html_url"] as? String).flatMap(URL.init(string:))
+    }
+
+    private static func dmgAsset(from json: [String: Any]) -> URL? {
+        guard let assets = json["assets"] as? [[String: Any]] else { return nil }
+        for a in assets {
+            if let name = a["name"] as? String, name.lowercased().hasSuffix(".dmg"),
+               let u = a["browser_download_url"] as? String {
+                return URL(string: u)
+            }
+        }
+        return nil
+    }
+
+    /// Is `a` a newer version than `b`? Numeric, per dotted component; ignores a
+    /// pre-release/build suffix (1.2.3-rc1 → 1.2.3). 0.10.0 > 0.9.0.
+    static func isNewer(_ a: String, than b: String) -> Bool {
+        let pa = parse(a), pb = parse(b)
+        for i in 0..<max(pa.count, pb.count) {
+            let x = i < pa.count ? pa[i] : 0
+            let y = i < pb.count ? pb[i] : 0
+            if x != y { return x > y }
+        }
+        return false
+    }
+
+    private static func parse(_ v: String) -> [Int] {
+        let core = v.split(whereSeparator: { $0 == "-" || $0 == "+" }).first.map(String.init) ?? v
+        return core.split(separator: ".").map { Int($0) ?? 0 }
+    }
+}
diff --git a/website/src/layouts/Base.astro b/website/src/layouts/Base.astro
index dd35a18..10e1232 100644
--- a/website/src/layouts/Base.astro
+++ b/website/src/layouts/Base.astro
@@ -18,12 +18,14 @@ const navItems = lang === "zh-CN"
   ? [
       { href: "/zh-CN/", label: "首页" },
       { href: "/zh-CN/install", label: "安装" },
+      { href: "/zh-CN/changelog", label: "更新日志" },
       { href: "/zh-CN/moods", label: "表情画廊" },
       { href: "https://github.com/oratis/LISA", label: "GitHub", external: true },
     ]
   : [
       { href: "/", label: "home" },
       { href: "/install", label: "install" },
+      { href: "/changelog", label: "changelog" },
       { href: "/moods", label: "moods" },
       { href: "https://github.com/oratis/LISA", label: "github", external: true },
     ];
diff --git a/website/src/lib/releases.ts b/website/src/lib/releases.ts
new file mode 100644
index 0000000..b2f3453
--- /dev/null
+++ b/website/src/lib/releases.ts
@@ -0,0 +1,38 @@
+/**
+ * Fetch published GitHub releases for the changelog page, at BUILD time.
+ *
+ * Build-time (not client-side) so visitors load static HTML — no API rate
+ * limits, no JS. Fail-safe: any network/parse error returns [] so the site
+ * build never breaks; the page then shows a "see releases on GitHub" fallback.
+ */
+export interface Release {
+  name: string;
+  tag: string;
+  date: string; // YYYY-MM-DD
+  url: string;
+  body: string;
+}
+
+const RELEASES_API = "https://api.github.com/repos/oratis/LISA/releases?per_page=30";
+
+export async function fetchReleases(): Promise<Release[]> {
+  try {
+    const res = await fetch(RELEASES_API, {
+      headers: { accept: "application/vnd.github+json", "user-agent": "lisa-website" },
+    });
+    if (!res.ok) return [];
+    const raw = (await res.json()) as Array<Record<string, unknown>>;
+    if (!Array.isArray(raw)) return [];
+    return raw
+      .filter((r) => r && r.draft !== true)
+      .map((r) => ({
+        name: (r.name as string) || (r.tag_name as string) || "release",
+        tag: (r.tag_name as string) || "",
+        date: typeof r.published_at === "string" ? r.published_at.slice(0, 10) : "",
+        url: (r.html_url as string) || "https://github.com/oratis/LISA/releases",
+        body: ((r.body as string) || "").trim(),
+      }));
+  } catch {
+    return [];
+  }
+}
diff --git a/website/src/pages/changelog.astro b/website/src/pages/changelog.astro
new file mode 100644
index 0000000..20476cc
--- /dev/null
+++ b/website/src/pages/changelog.astro
@@ -0,0 +1,42 @@
+---
+import Base from "../layouts/Base.astro";
+import { fetchReleases } from "../lib/releases";
+
+// Fetched at build time (fail-safe → [] → GitHub fallback below).
+const releases = await fetchReleases();
+---
+<Base title="Changelog" lang="en" description="What's new in Lisa — release notes by version.">
+  <h1>Changelog</h1>
+  <p>
+    Every Lisa release, newest first. Grab the latest from <a href="/install">install</a>,
+    or browse <a href="https://github.com/oratis/LISA/releases/latest" target="_blank" rel="noopener">GitHub Releases ↗</a>.
+    The Mac app checks here too — <em>Lisa ▸ About ▸ Check for Updates</em>.
+  </p>
+
+  {releases.length === 0 ? (
+    <p>
+      Couldn't load releases right now — see them on
+      <a href="https://github.com/oratis/LISA/releases" target="_blank" rel="noopener">GitHub ↗</a>.
+    </p>
+  ) : (
+    releases.map((r) => (
+      <section class="term release">
+        <div class="term-bar">
+          <span class="term-dot r"></span><span class="term-dot y"></span><span class="term-dot g"></span>
+          <span class="term-title">{r.tag || r.name}{r.date ? ` · ${r.date}` : ""}</span>
+        </div>
+        <div class="term-body">
+          {r.body
+            ? <pre>{r.body}</pre>
+            : <p>No notes for this release.</p>}
+          <p><a href={r.url} target="_blank" rel="noopener">View {r.tag || "release"} on GitHub ↗</a></p>
+        </div>
+      </section>
+    ))
+  )}
+
+  <style>
+    .release { margin: 22px 0; }
+    .release .term-body pre { margin: 0 0 14px; }
+  </style>
+</Base>
diff --git a/website/src/pages/zh-CN/changelog.astro b/website/src/pages/zh-CN/changelog.astro
new file mode 100644
index 0000000..bb78fb0
--- /dev/null
+++ b/website/src/pages/zh-CN/changelog.astro
@@ -0,0 +1,42 @@
+---
+import Base from "../../layouts/Base.astro";
+import { fetchReleases } from "../../lib/releases";
+
+// 构建时拉取(失败安全 → [] → 回退到 GitHub)。
+const releases = await fetchReleases();
+---
+<Base title="更新日志" lang="zh-CN" description="Lisa 各版本的更新内容。">
+  <h1>更新日志</h1>
+  <p>
+    每个 Lisa 版本,最新在前。最新版从 <a href="/zh-CN/install">安装页</a> 获取,
+    或浏览 <a href="https://github.com/oratis/LISA/releases/latest" target="_blank" rel="noopener">GitHub Releases ↗</a>。
+    Mac 应用也会查这里 —— <em>Lisa ▸ 关于 ▸ 检查更新</em>。
+  </p>
+
+  {releases.length === 0 ? (
+    <p>
+      暂时无法加载发布信息 —— 请到
+      <a href="https://github.com/oratis/LISA/releases" target="_blank" rel="noopener">GitHub ↗</a> 查看。
+    </p>
+  ) : (
+    releases.map((r) => (
+      <section class="term release">
+        <div class="term-bar">
+          <span class="term-dot r"></span><span class="term-dot y"></span><span class="term-dot g"></span>
+          <span class="term-title">{r.tag || r.name}{r.date ? ` · ${r.date}` : ""}</span>
+        </div>
+        <div class="term-body">
+          {r.body
+            ? <pre>{r.body}</pre>
+            : <p>该版本无发布说明。</p>}
+          <p><a href={r.url} target="_blank" rel="noopener">在 GitHub 查看 {r.tag || "release"} ↗</a></p>
+        </div>
+      </section>
+    ))
+  )}
+
+  <style>
+    .release { margin: 22px 0; }
+    .release .term-body pre { margin: 0 0 14px; }
+  </style>
+</Base>