diff --git a/homebrew/README.md b/homebrew/README.md
index a6d54a7..bdac9a0 100644
--- a/homebrew/README.md
+++ b/homebrew/README.md
@@ -15,7 +15,6 @@
 
 - 执行 `brew update -v` 更新 Homebrew 仓库。
 - 执行 `brew doctor` 做健康检查；发现问题时给出警告，但不中断后续流程。
-- 检查并安装 `buo/cask-upgrade` tap，保留 GUI 应用升级相关兼容能力。
 - 使用 `brew upgrade --formula` 升级命令行工具。
 - 使用 `brew upgrade --cask --greedy --force` 强制升级 GUI 应用。
 - 当 Cask 升级命令因瞬时下载错误返回失败，但复核确认已无过期 Cask 时，继续执行后续清理。
@@ -160,10 +159,9 @@ BREWUP_DEBUG=1 brewup
 
 1. `brew update -v`
 2. `brew doctor`
-3. 检查 `buo/cask-upgrade` tap
-4. `brew upgrade --formula`
-5. `brew upgrade --cask --greedy --force`
-6. `brew cleanup --prune=all`
+3. `brew upgrade --formula`
+4. `brew upgrade --cask --greedy --force`
+5. `brew cleanup --prune=all`
 
 ## 常见问题
 
@@ -194,9 +192,15 @@ brewup --width 130
 HB_TERMINAL_WIDTH=130 brewup
 ```
 
-### `brew tap buo/cask-upgrade` 失败
+### `Error: can't modify frozen Array`
 
-通常是网络、Homebrew tap 或权限问题。先确认 Homebrew 可正常访问 GitHub 和对应 tap。
+这是 `buo/cask-upgrade` tap 与新版 Homebrew 的兼容问题。先移除该 tap：
+
+```bash
+brew untap buo/cask-upgrade
+```
+
+GUI 应用升级现在使用 Homebrew 官方的 `brew upgrade --cask --greedy --force`，脚本不再需要 `buo/cask-upgrade`。
 
 ### `brew doctor` 提示 warning
 
diff --git a/homebrew/brew-upgrade-manager.sh b/homebrew/brew-upgrade-manager.sh
index fe2f686..cd36204 100644
--- a/homebrew/brew-upgrade-manager.sh
+++ b/homebrew/brew-upgrade-manager.sh
@@ -90,18 +90,7 @@ separator
 printf "\n"
 
 separator
-print_header "Step 3: Verifying brew-cu extension for GUI Apps"
-if ! brew tap | grep -q "buo/cask-upgrade"; then
-    echo -e "${YELLOW}Extension 'brew-cu' not found. Installing now...${NC}"
-    brew tap buo/cask-upgrade
-else
-    echo -e "${GREEN}Extension 'brew-cu' is already active.${NC}"
-fi
-separator
-printf "\n"
-
-separator
-print_header "Step 4: Executing comprehensive upgrades (Formulae & Casks)"
+print_header "Step 3: Executing comprehensive upgrades (Formulae & Casks)"
 echo -e "${NC}"
 
 # 1. 升级命令行工具 (Formulae)
@@ -125,7 +114,7 @@ separator
 printf "\n"
 
 separator
-print_header "Step 5: Cleaning up old files and caches (brew cleanup --prune=all)"
+print_header "Step 4: Cleaning up old files and caches (brew cleanup --prune=all)"
 brew cleanup --prune=all
 separator
 printf "\n"