[BUG] Update available text displays even when fully updated

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Description:

Claude Code displays an "update available" notification, but when I attempt to upgrade via Homebrew, it reports the latest version is already installed.

Steps to reproduce:

1. Launch Claude Code
2. Observe "update available" notification
3. Run brew update && brew upgrade claude-code
4. Homebrew reports: "Warning: Not upgrading claude-code, the latest version is already installed"

Expected behavior:
No update notification should appear when the installed version matches the latest available version.

Actual behavior:
Update notification appears despite being on the latest version.

What Should Happen?

No update notification should appear when the installed version matches the latest available version.

Error Messages/Logs

Steps to Reproduce

Environment:

• OS: macOS (Darwin 24.6.0)
• Installation method: Homebrew
• Claude Code version: 2.16

Additional context:
Ran brew update to ensure Homebrew formulas were current before attempting upgrade. Issue persists.

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.6 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Cursor

Additional Information

_No response_