# Deno v2.7.7 — Release & Upgrade Intelligence
- **Product:** Deno (https://deno.com)
- **Version:** v2.7.7
- **Released:** Mar 19, 2026
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/deno/updates/v2.7.7/

## Executive Summary (TL;DR)
Deno v2.7.7. Source highlight: fix(core): implement select fallback on macOS (#32812)

## Improvements
- perf(ext/webidl): optimize dictionary converters (#32729)

## Bug Fixes
- fix(core): implement select fallback on macOS (#32812)
- fix(ext/node): add disabled process function stubs in worker threads (#32809)
- fix(ext/node): add key/IV length validation for aes-128-cbc and ecb cipher
- fix(ext/node): improve node:dns module compatibility (#32704)
- fix(ext/node): improve process.title and support --title flag (#32201)
- fix(ext/node): set kLastWriteWasAsync in JS write path to prevent double