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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.129 5 May 2026

Opt-In Package Manager Auto-Updates

What

Claude Code can now automatically run supported package-manager updates when a newer version is available.

Usage

CLAUDE_CODE_PACKAGE_MANAGER_AUTO_UPDATE=1 claude

Details

When enabled, Claude Code can run update commands for supported package managers instead of only telling you what command to run.
Homebrew uses brew upgrade --cask ....
Windows winget uses winget.exe upgrade --id Anthropic.ClaudeCode --exact --silent --disable-interactivity.
The UI reports progress with messages like Updating via ..., success with ✓ Update installed · Restart to apply, and falls back to manual instructions if auto-update fails.
Manual update guidance now also recognizes mise upgrade claude.

Evidence

Auto-update gate and commands (search for "CLAUDE_CODE_PACKAGE_MANAGER_AUTO_UPDATE", "--disable-interactivity", and "✓ Update installed")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.129 →