# Deno v1.14.3 — Release & Upgrade Intelligence
- **Product:** Deno (https://deno.com)
- **Version:** v1.14.3
- **Released:** Oct 04, 2021
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/deno/updates/v1.14.3/

## Executive Summary (TL;DR)
Deno v1.14.3. Source highlight: feat(core): implement Deno.core.isProxy() (#12288)

## New Features
- feat(core): implement Deno.core.isProxy() (#12288)

## Improvements
- perf(core): use opcall() directly (#12310)
- perf(fetch): optimize fillHeaders() key iteration (#12287)
- perf(web): optimize byteLowerCase() (#12282)
- perf(web): ~400x faster http header trimming (#12277)
- perf(web/Event): move last class field to constructor (#12265)
- perf(webidl): optimize createDictionaryConverter() (#12279)

## Bug Fixes
- fix(core/runtime): sync_ops_cache if nuked Deno ns (#12302)
- fix(ext/crypto): decode id-RSASSA-PSS with default params (#12147)
- fix(ext/crypto): missing Aes key typings (#12307)
- fix(ext/crypto): use NotSupportedError for importKey() (#12289)
- fix(ext/fetch): avoid panic when header is invalid (#12244)
- fix(ext/http): merge identical if/else branches (#12269)