# Deno v1.23.2 — Release & Upgrade Intelligence
- **Product:** Deno (https://deno.com)
- **Version:** v1.23.2
- **Released:** Jun 30, 2022
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/deno/updates/v1.23.2/

## Executive Summary (TL;DR)
Deno v1.23.2. Source highlight: feat(unstable/ffi): thread safe callbacks (#14942)

## New Features
- feat(unstable/ffi): thread safe callbacks (#14942)

## Improvements
- perf(ext/ffi): optimize synchronous calls (#14945)
- perf(ext/web): avoid reallocations in op_base64_atob (#15018)
- perf(ext/web): use base64-simd for atob/btoa (#14992)
- perf(serde_v8): smallvec ByteString (#15008)

## Bug Fixes
- fix(core): don't panic on non-existent cwd (#14957)
- fix(docs): --watch arg is stable (#14970)
- fix(dts/ffi): non-exact types break FFI inference (#14968)
- fix(ext/crypto): add EcdhKeyDeriveParams to deriveKey types (#15005)
- fix(ext/ffi): empty buffers error with index out of bounds on FFI (#14997)
- fix(ext/web): remove `ErrorEventInit`'s error default (#14809)