# Deno v1.23.1 — Release & Upgrade Intelligence
- **Product:** Deno (https://deno.com)
- **Version:** v1.23.1
- **Released:** Jun 23, 2022
- **Impact Score:** 7/10
- **Breaking Changes:** Source flagged
- **Canonical Analysis:** https://changelogs.us/deno/updates/v1.23.1/

## Executive Summary (TL;DR)
Deno v1.23.1. Source highlight: BREAKING(unstable/ffi): Remove `Deno.UnsafePointer` indirection (#14915)

## Breaking Changes & Deprecations
- - BREAKING(unstable/ffi): Remove `Deno.UnsafePointer` indirection (#14915)

## New Features
- feat(unstable/ffi): Callbacks (#14663)

## Improvements
- perf(core): Cache source lookups (#14816)
- perf(ext/ffi): Optimize FFI Rust side type checks (#14923)

## Bug Fixes
- fix(check): ignore TS2306 (#14940)
- fix(docs): update description of `--check` flag (#14890)
- fix(ext/fetch): add `accept-language` default header to fetch (#14882)
- fix(ext/web): add EventTarget brand checking (#14637)
- fix(ext/web): handle rid=0 in TextDecoder#decode (#14894)
- fix(fmt): ignore node_modules directory (#14943)