diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..e277b56
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,22 @@
+# Binary
+u-tabs
+u-tabs.exe
+u-tabs-linux
+whale-windows-amd64.exe
+dist/
+
+# Config
+config.yaml
+
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+
+# OS
+Thumbs.db
+.DS_Store
+
+# Claude
+.claude/
diff --git a/internal/app.go b/internal/app.go
index b286051..ce95505 100644
--- a/internal/app.go
+++ b/internal/app.go
@@ -30,6 +30,7 @@ type Model struct {
 	launched    string
 	history     HistoryState
 	pendingCmd  string // Linux: 退出后执行的命令
+	update      UpdateState
 }
 
 func NewModel() *Model {
@@ -40,7 +41,8 @@ func NewModel() *Model {
 }
 
 func (m *Model) Init() tea.Cmd {
-	return nil
+	m.update.Checking = true
+	return CheckUpdateCmd()
 }
 
 // totalTabs 包含 HISTORY 的总 Tab 数
@@ -71,6 +73,22 @@ func (m *Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 	case SummaryResultMsg:
 		m.applySummary(msg.SessionID, msg.Summary, msg.Completed, msg.Pending)
 		return m, m.nextSummaryCmd()
+	case UpdateAvailableMsg:
+		m.update.Checking = false
+		m.update.Available = true
+		m.update.NewVersion = msg.NewVersion
+		m.update.Changelog = msg.Changelog
+		m.update.DownloadURL = msg.DownloadURL
+		m.update.SHA256 = msg.SHA256
+		m.update.FileSize = msg.FileSize
+	case UpdateCompleteMsg:
+		m.update.Updating = false
+		m.update.Done = true
+		m.update.Available = false
+	case UpdateErrorMsg:
+		m.update.Updating = false
+		m.update.Error = msg.Err
+		m.update.Checking = false
 	}
 	return m, nil
 }
@@ -82,6 +100,11 @@ func (m *Model) handleKey(s string) (*Model, tea.Cmd) {
 	switch s {
 	case "q", "ctrl+c":
 		return m, tea.Quit
+	case "u":
+		if m.update.Available && !m.update.Updating {
+			m.update.Updating = true
+			return m, SelfUpdateCmd(m.update.DownloadURL, m.update.SHA256, m.update.NewVersion)
+		}
 	}
 
 	// 数字键跳转 Tab
@@ -400,7 +423,7 @@ func (m *Model) render() string {
 	var b strings.Builder
 
 	// ── header: title + tabs ──
-	b.WriteString(style.TitleStyle.Render(" u-tabs "))
+	b.WriteString(style.TitleStyle.Render(" u-tabs v" + Version + " "))
 	sep := style.TabSep.Render(" | ")
 
 	// Workspace Tabs
@@ -455,6 +478,20 @@ func (m *Model) render() string {
 		b.WriteString(lipgloss.NewStyle().Foreground(style.Accent).Render(fmt.Sprintf(" ✓ %s", m.launched)))
 		m.launched = ""
 	}
+		// update status
+		if m.update.Done {
+		b.WriteString(lipgloss.NewStyle().Foreground(style.Success).Bold(true).
+			Render(fmt.Sprintf(" updated to v%s, restart to apply", m.update.NewVersion)))
+		} else if m.update.Error != nil {
+		b.WriteString(lipgloss.NewStyle().Foreground(style.Red).
+			Render(fmt.Sprintf(" update failed: %v", m.update.Error)))
+		} else if m.update.Updating {
+		b.WriteString(lipgloss.NewStyle().Foreground(style.Warning).
+			Render(" updating..."))
+		} else if m.update.Available {
+		b.WriteString(lipgloss.NewStyle().Foreground(style.Warning).Bold(true).
+			Render(fmt.Sprintf(" v%s available [u]update", m.update.NewVersion)))
+		}
 	b.WriteString("\n")
 
 	helpParts := m.renderHelp()
diff --git a/internal/update.go b/internal/update.go
new file mode 100644
index 0000000..049eca1
--- /dev/null
+++ b/internal/update.go
@@ -0,0 +1,269 @@
+package internal
+
+import (
+	"crypto/sha256"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"runtime"
+	"strings"
+	"time"
+
+	"charm.land/bubbletea/v2"
+)
+
+// Version 当前版本，发布时更新
+const Version = "0.1.0"
+
+// --- 远程 JSON 结构 ---
+
+type platformInfo struct {
+	DownloadURL string `json:"download_url"`
+	FileSize    int64  `json:"file_size"`
+	SHA256      string `json:"sha256"`
+}
+
+type versionInfo struct {
+	Version      string                  `json:"version"`
+	ReleaseDate  string                  `json:"release_date"`
+	Changelog    string                  `json:"changelog"`
+	Platforms    map[string]platformInfo `json:"platforms"`
+}
+
+// --- bubbletea 消息类型 ---
+
+// UpdateAvailableMsg 发现新版本
+type UpdateAvailableMsg struct {
+	NewVersion  string
+	Changelog   string
+	DownloadURL string
+	SHA256      string
+	FileSize    int64
+}
+
+// UpdateCompleteMsg 更新完成
+type UpdateCompleteMsg struct {
+	NewVersion string
+}
+
+// UpdateErrorMsg 更新失败
+type UpdateErrorMsg struct {
+	Err error
+}
+
+// --- 更新状态 ---
+
+// UpdateState 更新流程状态
+type UpdateState struct {
+	Checking    bool
+	Available   bool
+	Updating    bool
+	NewVersion  string
+	Changelog   string
+	DownloadURL string
+	SHA256      string
+	FileSize    int64
+	Done        bool
+	Error       error
+}
+
+// --- Cmd 函数 ---
+
+// CheckUpdateCmd 检查远程是否有新版本，返回 bubbletea Cmd
+func CheckUpdateCmd() tea.Cmd {
+	return func() tea.Msg {
+		client := &http.Client{Timeout: 10 * time.Second}
+
+		req, err := http.NewRequest("GET", "https://c.1216.top/u-tabs/last-version.json", nil)
+		if err != nil {
+			return nil
+		}
+		req.Header.Set("User-Agent", "u-tabs/"+Version)
+
+		resp, err := client.Do(req)
+		if err != nil {
+			return nil
+		}
+		defer resp.Body.Close()
+
+		if resp.StatusCode != http.StatusOK {
+			return nil
+		}
+
+		body, err := io.ReadAll(resp.Body)
+		if err != nil {
+			return nil
+		}
+
+		var info versionInfo
+		if err := json.Unmarshal(body, &info); err != nil {
+			return nil
+		}
+
+		// 查找当前平台的下载信息
+		platformKey := runtime.GOOS + "-" + runtime.GOARCH
+		pi, ok := info.Platforms[platformKey]
+		if !ok {
+			return nil
+		}
+
+		// 比较版本
+		if !semverCompare(Version, info.Version) {
+			return nil
+		}
+
+		return UpdateAvailableMsg{
+			NewVersion:  info.Version,
+			Changelog:   info.Changelog,
+			DownloadURL: pi.DownloadURL,
+			SHA256:      pi.SHA256,
+			FileSize:    pi.FileSize,
+		}
+	}
+}
+
+// SelfUpdateCmd 下载并替换当前二进制，返回 bubbletea Cmd
+func SelfUpdateCmd(downloadURL, expectedSHA256, newVersion string) tea.Cmd {
+	return func() tea.Msg {
+		// 下载到临时文件
+		client := &http.Client{Timeout: 5 * time.Minute}
+
+		req, err := http.NewRequest("GET", downloadURL, nil)
+		if err != nil {
+			return UpdateErrorMsg{Err: fmt.Errorf("create request failed: %w", err)}
+		}
+		req.Header.Set("User-Agent", "u-tabs/"+Version)
+
+		resp, err := client.Do(req)
+		if err != nil {
+			return UpdateErrorMsg{Err: fmt.Errorf("download failed: %w", err)}
+		}
+		defer resp.Body.Close()
+
+		if resp.StatusCode != http.StatusOK {
+			return UpdateErrorMsg{Err: fmt.Errorf("download returned status %d", resp.StatusCode)}
+		}
+
+		tmpFile, err := os.CreateTemp("", "u-tabs-update-*")
+		if err != nil {
+			return UpdateErrorMsg{Err: fmt.Errorf("create temp file failed: %w", err)}
+		}
+		tmpPath := tmpFile.Name()
+
+		hasher := sha256.New()
+		if _, err := io.Copy(io.MultiWriter(tmpFile, hasher), resp.Body); err != nil {
+			tmpFile.Close()
+			os.Remove(tmpPath)
+			return UpdateErrorMsg{Err: fmt.Errorf("download write failed: %w", err)}
+		}
+		tmpFile.Close()
+
+		// 校验 SHA256
+		actualSHA := fmt.Sprintf("%x", hasher.Sum(nil))
+		if !strings.EqualFold(actualSHA, expectedSHA256) {
+			os.Remove(tmpPath)
+			return UpdateErrorMsg{Err: fmt.Errorf("sha256 mismatch: expected %s, got %s", expectedSHA256, actualSHA)}
+		}
+
+		// 替换当前二进制
+		exePath, err := os.Executable()
+		if err != nil {
+			os.Remove(tmpPath)
+			return UpdateErrorMsg{Err: fmt.Errorf("get executable path failed: %w", err)}
+		}
+
+		// 备份旧二进制
+		oldPath := exePath + ".old"
+		_ = os.Remove(oldPath) // 清理可能残留的旧备份
+		if err := os.Rename(exePath, oldPath); err != nil {
+			os.Remove(tmpPath)
+			return UpdateErrorMsg{Err: fmt.Errorf("rename old binary failed: %w", err)}
+		}
+
+		// 复制新二进制到原路径
+		if err := copyFile(tmpPath, exePath); err != nil {
+			// 回滚：恢复旧二进制
+			os.Remove(exePath)
+			os.Rename(oldPath, exePath)
+			os.Remove(tmpPath)
+			return UpdateErrorMsg{Err: fmt.Errorf("copy new binary failed: %w", err)}
+		}
+
+		// Linux/macOS: 设置可执行权限
+		if runtime.GOOS != "windows" {
+			os.Chmod(exePath, 0755)
+		}
+
+		// 清理临时文件和旧备份
+		os.Remove(tmpPath)
+		_ = os.Remove(oldPath)
+
+		return UpdateCompleteMsg{NewVersion: newVersion}
+	}
+}
+
+// --- 辅助函数 ---
+
+// semverCompare 比较 v1 和 v2，v2 > v1 时返回 true
+func semverCompare(v1, v2 string) bool {
+	parts1 := strings.Split(v1, ".")
+	parts2 := strings.Split(v2, ".")
+
+	maxLen := len(parts1)
+	if len(parts2) > maxLen {
+		maxLen = len(parts2)
+	}
+
+	for i := 0; i < maxLen; i++ {
+		var n1, n2 int
+		if i < len(parts1) {
+			n1 = parseSemverPart(parts1[i])
+		}
+		if i < len(parts2) {
+			n2 = parseSemverPart(parts2[i])
+		}
+		if n2 > n1 {
+			return true
+		}
+		if n2 < n1 {
+			return false
+		}
+	}
+	return false // 版本相同
+}
+
+// parseSemverPart 解析语义版本的一段为数字，非数字前缀的部分返回 0
+func parseSemverPart(s string) int {
+	// 去除可能的前缀字母 (如 "v1" → "1")
+	n := 0
+	for _, c := range s {
+		if c >= '0' && c <= '9' {
+			n = n*10 + int(c-'0')
+		} else {
+			break
+		}
+	}
+	return n
+}
+
+// copyFile 复制文件内容
+func copyFile(src, dst string) error {
+	in, err := os.Open(src)
+	if err != nil {
+		return err
+	}
+	defer in.Close()
+
+	out, err := os.Create(dst)
+	if err != nil {
+		return err
+	}
+	defer out.Close()
+
+	if _, err := io.Copy(out, in); err != nil {
+		return err
+	}
+	return out.Sync()
+}