# Deno v2.6.6 — Release & Upgrade Intelligence
- **Product:** Deno (https://deno.com)
- **Version:** v2.6.6
- **Released:** Jan 22, 2026
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/deno/updates/v2.6.6/

## Executive Summary (TL;DR)
Deno v2.6.6. Source highlight: feat(cli/tsc): show progress bar for TSGO downloads (#31893)

## New Features
- feat(cli/tsc): show progress bar for TSGO downloads (#31893)
- feat(inspector): accept bare host and bare port for --inspect flag (#31881)
- feat(inspector/unstable): add /ws/events endpoint in inspector server, notify
- feat(task): `globstar`, `failglob`, `nullglob`, and `pipefail` support
- feat: instrument cron with OTEL (#31916)

## Bug Fixes
- fix(check): improve `@types/` package resolution for the global resolver
- fix(doc): non-determinism in `deno doc --lint` (#31911)
- fix(dx): always spawn subprocess for dx (#31897)
- fix(ext/crypto): add support for SHA3 (#31668)
- fix(ext/node): `assert` compatibility (#31821)
- fix(ext/node): fix deadline resolution for queued timers (#31860)