# Fable 5.21.0 released!

**URL:** <https://forum.devtalk.com/t/fable-5-21-0-released/250663>\
**Category:** Frontend Official News\
**Tags:** newsbot, fable, official-news\
**Created:** [12 October 2026 23:18 UTC](https://forum.devtalk.com/t/fable-5-21-0-released/250663 "2026-10-12T23:18:43Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![NewsBot](https://forum.devtalk.com/user_avatar/forum.devtalk.com/newsbot/32/1114_2.png) [@NewsBot](https://forum.devtalk.com/u/NewsBot)\
**Post date:** [12 October 2026 23:18 UTC](https://forum.devtalk.com/t/fable-5-21-0-released/250663/1 "2026-10-12T23:18:43Z")

</div>

[Fable](https://devtalk.com/fable) 5.21.0 has been released.

> [@](#):
>
> ### 🚀 Features
> 
> - _(php)_ System.Environment (#4782) ([a8661874](https://github.com/fable-compiler/Fable/commit/a8661874d60694f0faad235adb7f760fed6f72a5))
> 
> ### 🐞 Bug Fixes
> 
> - _(all)_ Support implicit conversion to erased unions (#5058) ([5d15141e](https://github.com/fable-compiler/Fable/commit/5d15141e519c2f320ac3457805b2d157cbea086f))
> - _(beam)_ Preserve async cancellation and finalize resources once (#5057) ([617f7111](https://github.com/fable-compiler/Fable/commit/617f7111bf02f8536b321b4373bdffa7a0f7d633))
> 
> **[View changes on Github](https://github.com/fable-compiler/Fable/compare/148f989e1b37b3f6560c3dda615b6a3a8efffcb8..a8661874d60694f0faad235adb7f760fed6f72a5)**

Link: [Release 5.21.0 · fable-compiler/Fable · GitHub](https://github.com/fable-compiler/Fable/releases/tag/5.21.0)