# F# Weekly #37, 2026 — F# 11 RC1 and Fantomas 8 Beta Land

**URL:** <https://forums.fsharp.org/t/f-weekly-37-2026-f-11-rc1-and-fantomas-8-beta-land/5197>\
**Category:** General\
**Created:** [September 12, 2026, 7:36pm UTC](https://forums.fsharp.org/t/f-weekly-37-2026-f-11-rc1-and-fantomas-8-beta-land/5197 "2026-09-12T19:36:53Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![sergey\_tihon](https://yyz2.discourse-cdn.com/flex030/user_avatar/forums.fsharp.org/sergey_tihon/32/25_2.png) [@sergey\_tihon](https://forums.fsharp.org/u/sergey_tihon)\
**Post date:** [September 12, 2026, 7:36pm UTC](https://forums.fsharp.org/t/f-weekly-37-2026-f-11-rc1-and-fantomas-8-beta-land/5197/1 "2026-09-12T19:36:53Z")

</div>

Welcome to F# Weekly,

A roundup of F# content from this past week:

**News**

- [F# in .NET 11 RC 1 - Release Notes](https://github.com/dotnet/core/blob/main/release-notes/11.0/preview/rc1/fsharp.md)

> **[Sergey Tihon 🦔🦀 (@sergeytihon.com)](https://bsky.app/profile/sergeytihon.com/post/3mvdryunkck24)**
>
> F# in .NET 11 RC 1 - Release Notes #fsharp https://github.com/dotnet/core/blob/main/release-notes/11.0/preview/rc1/fsharp.md

**Microsoft News**

- [Announcing .NET 11 Release Candidate 1 - .NET Blog](https://devblogs.microsoft.com/dotnet/dotnet-11-rc-1/)
- [Use C# unions and closed hierarchies in ASP.NET Core - .NET Blog](https://devblogs.microsoft.com/dotnet/unions-and-closed-hierarchies-in-aspnetcore/)
- [.NET Conf 2026 Community Days Call for Presenters Is Open - .NET Blog](https://devblogs.microsoft.com/dotnet/dotnet-conf-2026-community-days-call-for-presenters/)
- [Today I will... find hidden latency across a distributed .NET application - Visual Studio Blog](https://devblogs.microsoft.com/visualstudio/today-i-will-find-hidden-latency-across-a-distributed-net-application/)
- [Your work might not need the smartest model - Microsoft for Developers](https://developer.microsoft.com/blog/your-work-might-not-need-the-smartest-model/)
- [Microsoft Foundry updates: July and August 2026](https://devblogs.microsoft.com/foundry/whats-new-in-microsoft-foundry-july-august-2026/)

**Videos**

- [Michal Lusiak - Developer Friendly Machine Learning with F# - NewCrafts 2018](https://www.youtube.com/watch?v=8AwbYLY87wQ)
- [.NET Unboxed: .NET 11 Release Candidate 1!!](https://www.youtube.com/watch?v=5fvi7m1QxIY)
- [Working With Your Data, Safely: Files, Approvals and Memory](https://www.youtube.com/watch?v=V58coa0llUo)

**Blogs**

- [Worse is better: C# versus F#](https://blog.ploeh.dk/2026/09/08/worse-is-better-c-versus-f/) - Mark Seemann
- [.NET 11 reaches its first release candidate! – Aptivi](https://officialaptivi.wordpress.com/2026/09/09/net-11-reaches-its-first-release-candidate/)

> **[ErikEJ (@erikej.bsky.social)](https://bsky.app/profile/erikej.bsky.social/post/3mv5jdkfxau2b)**
>
> Announcing .NET 11 Release Candidate 1
> https://ift.tt/d8zQ1Kv

**Highlighted projects**

- [fs-fio/fio: 🪻 A Type-Safe, Purely Functional Effect System for F#](https://github.com/fs-fio/fio)
- [serde-fs/Serde.FS: A deterministic, reflection‑free serialization and RPC platform for F#. Powered by Serde‑style source generation for .NET and (soon) Fable.](https://github.com/serde-fs/Serde.FS)
- [fsprojects/fantomas: FSharp source code formatter](https://github.com/fsprojects/fantomas)

**New Releases**

- [SageFs 0.6.483](https://www.nuget.org/packages/SageFs)
- [Pulsar.Client 3.19.1](https://www.nuget.org/packages/Pulsar.Client)
- [Fable 5.17.1](https://www.nuget.org/packages/Fable)
- [Fun.Build 1.2.0](https://www.nuget.org/packages/Fun.Build)
- [FsLexYacc 12.0.0](https://www.nuget.org/packages/FsLexYacc)
- [fsharp-analyzers 0.39.1](https://www.nuget.org/packages/fsharp-analyzers)
- [Fable.Compiler 5.16.1](https://www.nuget.org/packages/Fable.Compiler)
- [Fabulous 10.0.1](https://www.nuget.org/packages/Fabulous)
- [SqlHydra.Query 5.0.0](https://www.nuget.org/packages/SqlHydra.Query)
- [Facil 3.2.0](https://www.nuget.org/packages/Facil)
- [Fable.Python 5.5.0](https://www.nuget.org/packages/Fable.Python)
- [SqlHydra.Cli 5.0.0](https://www.nuget.org/packages/SqlHydra.Cli)
- [FSharp.HotChocolate 1.0.3](https://www.nuget.org/packages/FSharp.HotChocolate)
- [WoofWare.Myriad.Plugins 11.0.6](https://www.nuget.org/packages/WoofWare.Myriad.Plugins)
- [Xake 3.3.0.20](https://www.nuget.org/packages/Xake)
- [FAkka.FSharp.Collections.ParallelSeq 10.1.400](https://www.nuget.org/packages/FAkka.FSharp.Collections.ParallelSeq)
- [linq2db.FSharp 6.5.0](https://www.nuget.org/packages/linq2db.FSharp)
- [FAkka.Chiron 10.1.400](https://www.nuget.org/packages/FAkka.Chiron)
- [HeterogeneousCollections 1.1.7](https://www.nuget.org/packages/HeterogeneousCollections)
- [Oxpecker.Htmx 4.0.0](https://www.nuget.org/packages/Oxpecker.Htmx)
- [ShapeSifter 1.1.30](https://www.nuget.org/packages/ShapeSifter)
- [Str 0.24.1](https://www.nuget.org/packages/Str)
- [FsLangMcp 0.18.0](https://www.nuget.org/packages/FsLangMcp)
- [Mibo.Templates 5.0.0](https://www.nuget.org/packages/Mibo.Templates)
- [FsLex.Core 12.0.0](https://www.nuget.org/packages/FsLex.Core)
- [CommandTree 0.10.1](https://www.nuget.org/packages/CommandTree)
- [Earcut 3.2.33](https://www.nuget.org/packages/Earcut)
- [fsharp-refactor 0.8.11](https://www.nuget.org/packages/fsharp-refactor)
- [FsLiveDocs 0.6.2](https://www.nuget.org/packages/FsLiveDocs)
- [Orleans.FSharp.Runtime 5.0.1](https://www.nuget.org/packages/Orleans.FSharp.Runtime)
- [ResizeArrayT 0.27.0](https://www.nuget.org/packages/ResizeArrayT)
- [Orleans.FSharp 5.0.1](https://www.nuget.org/packages/Orleans.FSharp)
- [ArrayT 0.26.1](https://www.nuget.org/packages/ArrayT)
- [zest 0.7.3](https://www.nuget.org/packages/zest)
- [ModeMath 0.16.0](https://www.nuget.org/packages/ModeMath)
- [Dicts 0.5.1](https://www.nuget.org/packages/Dicts)
- [FunStripe.Core 2.4.0](https://www.nuget.org/packages/FunStripe.Core)
- [Summatic.FSUtils 0.6.0](https://www.nuget.org/packages/Summatic.FSUtils)
- [Axial 0.9.1](https://www.nuget.org/packages/Axial)
- [HsSqlAgent.SqlCore 2.0.5](https://www.nuget.org/packages/HsSqlAgent.SqlCore)
- [Klip 3.1.1](https://www.nuget.org/packages/Klip)
- [Fason 0.8.0](https://www.nuget.org/packages/Fason)
- [Kookerella.FsOpenXmlDsl 0.3.2](https://www.nuget.org/packages/Kookerella.FsOpenXmlDsl)
- [Feather.Cache 1.0.1](https://www.nuget.org/packages/Feather.Cache)
- [Partas.FSharp.Data.JsonSchema.Core 3.1.3](https://www.nuget.org/packages/Partas.FSharp.Data.JsonSchema.Core)
- [Hawaii5O 0.71.1](https://www.nuget.org/packages/Hawaii5O)
- [SvgPath 1.0.0](https://www.nuget.org/packages/SvgPath)
- [Beforeguard.Frostline.WoW 0.4.0](https://www.nuget.org/packages/Beforeguard.Frostline.WoW)
- [FunGoo 0.3.0](https://www.nuget.org/packages/FunGoo)
- [Euclid.BVH 0.1.0](https://www.nuget.org/packages/Euclid.BVH)
- [FunGoo.Widgets 0.3.0](https://www.nuget.org/packages/FunGoo.Widgets)
- [fsxpired 0.1.0](https://www.nuget.org/packages/fsxpired)
- [FSharp.Data.YamlValue 0.1.1](https://www.nuget.org/packages/FSharp.Data.YamlValue)
- [fantomas 8.0.0-beta-003](https://www.nuget.org/packages/fantomas/8.0.0-beta-003)

[https://twitter.com/verdonckflorian/status/2097651419092230500](https://twitter.com/verdonckflorian/status/2097651419092230500)

That’s all for now. Have a great week.

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