AspNetCore.Docs/aspnetcore/release-notes/aspnetcore-9.0.md

---
title: What's new in ASP.NET Core 9.0
author: rick-anderson
description: Learn about the new features in ASP.NET Core 9.0.
ms.author: riande
ms.custom: mvc
ms.date: 3/1/2024
uid: aspnetcore-9
---
# What's new in ASP.NET Core 9.0

This article highlights the most significant changes in ASP.NET Core 9.0 with links to relevant documentation.

This article will be updated as new preview releases are made available.

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## Blazor

This section describes new features for Blazor.

[!INCLUDE[](~/release-notes/aspnetcore-9/includes/blazor.md)]


## SignalR

This section describes new features for SignalR.

[!INCLUDE[](~/release-notes/aspnetcore-9/includes/signalr.md)]

## Minimal APIs

This section describes new features for minimal APIs.

## Authentication and authorization

This section describes new features for authentication and authorization.

[!INCLUDE[](~/release-notes/aspnetcore-9/includes/oidccustomparms.md)]

[!INCLUDE[](~/release-notes/aspnetcore-9/includes/httpsysextendedauth.md)]

## Miscellaneous

The following sections describe miscellaneous new features.

[!INCLUDE[](~/release-notes/aspnetcore-9/includes/debugger.md)]

## Additional resources