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Release Notes OpenClaw 4.21 Bug Fix

OpenClaw 2026.4.21 Released — Bundled Runtime Fix & Copilot Default Model Update

OpenClaw 2026.4.21 shipped approximately 8 hours after 4.20, making it one of the fastest patch turnarounds in recent memory. The release is now live on npm.

If you've been holding off on upgrading due to the Telegram/WhatsApp bundled runtime failures introduced in 4.20, this is the release to watch.

What's in 4.21

Bundled Runtime Regression Fix

The primary driver for this patch release is the bundled channel runtime regression in 4.20 — the same issue behind:

Both issues stem from the global npm upgrade path leaving bundled channel deps in a partially repaired state. 4.21 addresses the underlying packaging regression so openclaw update completes cleanly on global installs.

GitHub Copilot Default Model: claude-opus-4.6

New GitHub Copilot setups via OpenClaw now default to claude-opus-4.6 instead of the older gpt-4o default. The bundled model list is kept aligned, so new Copilot integrations start on a more capable model out of the box.

This is notable: it signals that claude-opus-4.6 is now considered the practical default for agentic coding workflows in the OpenClaw ecosystem, not just an option.

Should You Upgrade Now?

If you're on 4.15 or earlier and use Telegram or WhatsApp channels — yes, upgrade directly to 4.21, skipping 4.20.

openclaw gateway stop
npm install -g openclaw@latest
openclaw gateway start
openclaw doctor

If you're already on 4.20 and hit the bundled runtime failures — upgrade to 4.21 directly:

npm install -g openclaw@2026.4.21
openclaw gateway restart
openclaw doctor

If openclaw doctor still complains after upgrading, the nuclear option remains reliable:

openclaw gateway stop
npm uninstall -g openclaw
npm install -g openclaw@latest
openclaw gateway start
openclaw doctor

The Bigger Picture

OpenClaw shipping a patch within hours of a regression is a healthy sign for the project's maturity. The 4.20 bundled runtime issue was reported, escalated, and fixed within a single day — that's a responsive maintainer cadence for an open-source project this size.

That said, if managing upgrades, monitoring GitHub issues, and testing new releases every few days isn't how you want to spend your time — that's what ClawReady's managed care is for.

Let Us Handle Upgrades For You →