False 'Update available' message despite being on latest version

Description

After upgrading to the latest version via brew upgrade claude-code, the status bar still shows:

Update available! Run: brew upgrade claude-code

Steps to reproduce

1. Run brew upgrade claude-code
2. Confirm upgrade completed successfully (output shows claude-code was successfully upgraded!)
3. Verify installed version: claude --version → 2.1.87
4. Verify brew knows the correct version: brew info --cask claude-code → claude-code (Claude Code): 2.1.87, installed at /opt/homebrew/Caskroom/claude-code/2.1.87
5. Restart Claude Code
6. The "Update available!" message still appears in the status bar

Expected behavior

No update message should be shown when the installed version matches the latest available version.

Actual behavior

The update notification persists even after upgrading and restarting.

Environment

• Claude Code version: 2.1.87
• Installation method: Homebrew Cask
• OS: macOS (Darwin 25.3.0)
• Architecture: ARM64 (Apple Silicon)