Homebrew 更新 Claude Code 失败?这是原因和解决方案

如果你在 macOS 上通过 Homebrew 安装了 Claude Code,可能会遇到这个令人困惑的情况:

$ claude --update
Current version: 2.1.81
Update available: 2.1.81 → 2.1.91

To update, run:
  brew upgrade claude-code

于是你照做:

$ brew upgrade claude-code
Warning: Not upgrading claude-code, the latest version is already installed

brew updatebrew cleanupbrew reinstall——全都没用。到底怎么回事?