# Deno v2.1.5 — Release & Upgrade Intelligence
- **Product:** Deno (https://deno.com)
- **Version:** v2.1.5
- **Released:** Jan 09, 2025
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/deno/updates/v2.1.5/

## Executive Summary (TL;DR)
Deno v2.1.5. Source highlight: feat(unstable): implement QUIC (#21942)

## New Features
- feat(unstable): implement QUIC (#21942)
- feat(unstable): add JS linting plugin infrastructure (#27416)
- feat(unstable): add OTEL MeterProvider (#27240)
- feat(unstable): no config npm:@opentelemetry/api integration (#27541)
- feat(unstable): replace SpanExporter with TracerProvider (#27473)
- feat(unstable): support selectors in JS lint plugins (#27452)

## Improvements
- perf(fs/windows): stat - only open file once (#27487)
- perf(node/fs/copy): reduce metadata lookups copying directory (#27495)
- perf: don't store duplicate info for ops in the snapshot (#27430)
- perf: remove now needless canonicalization getting closest package.json
- perf: upgrade to deno_semver 0.7 (#27426)

## Bug Fixes
- fix(check): line-break between diagnostic message chain entries (#27543)
- fix(check): move module not found errors to typescript diagnostics (#27533)
- fix(compile): analyze modules in directory specified in --include (#27296)
- fix(compile): be more deterministic when compiling the same code in different
- fix(compile): display embedded file sizes and total (#27360)
- fix(compile): output contents of embedded file system (#27302)