---
title: Migrate from ASP.NET Core in .NET 8 to ASP.NET Core in .NET 9
author: rick-anderson
description: Learn how to migrate an ASP.NET Core in .NET 8 to ASP.NET Core in .NET 9
ms.author: riande
ms.date: 2/11/2024
uid: migration/80-to-90
---

<!-- New content should be added to ~/migration/includes/aspnetcore-9/includes/{FILE}.md files. This will help prevent merge conflicts in this file. -->

# Migrate from ASP.NET Core in .NET 8 to ASP.NET Core in .NET 9

This article explains how to update an ASP.NET Core in .NET 8 to ASP.NET Core in .NET 9.

## Prerequisites

# [Visual Studio](#tab/visual-studio)

[!INCLUDE[](~/includes/net-prereqs-vs-9.0.md)]

# [Visual Studio Code](#tab/visual-studio-code)

[!INCLUDE[](~/includes/net-prereqs-vsc-9.0.md)]

---

## Update the .NET SDK version in `global.json`

If you rely on a [`global.json`](/dotnet/core/tools/global-json) file to target a specific .NET Core SDK version, update the `version` property to the .NET 9.0 SDK version that's installed. For example:

```diff
{
  "sdk": {
-    "version": "8.0.100"
+    "version": "9.0.100"
  }
}
```

## Update the target framework

Update the project file's [Target Framework Moniker (TFM)](/dotnet/standard/frameworks) to `net9.0`:

```diff
<Project Sdk="Microsoft.NET.Sdk.Web">

  <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
  </PropertyGroup>

</Project>
```

## Update package references

In the project file, update each [`Microsoft.AspNetCore.*`](https://www.nuget.org/packages?q=Microsoft.AspNetCore.*), [`Microsoft.EntityFrameworkCore.*`](https://www.nuget.org/packages?q=Microsoft.EntityFrameworkCore.*), [`Microsoft.Extensions.*`](https://www.nuget.org/packages?q=Microsoft.Extensions.*), and [`System.Net.Http.Json`](https://www.nuget.org/packages/System.Net.Http.Json) package reference's `Version` attribute to 9.0.0 or later. For example:

```diff
<ItemGroup>
-   <PackageReference Include="Microsoft.AspNetCore.JsonPatch" Version="8.0.2" />
-   <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="8.0.2" />
-   <PackageReference Include="Microsoft.Extensions.Caching.Abstractions" Version="8.0.0" />
-   <PackageReference Include="System.Net.Http.Json" Version="8.0.0" />
+   <PackageReference Include="Microsoft.AspNetCore.JsonPatch" Version="9.0.0-preview.1.24081.5" />
+   <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="9.0.0-preview.1.24081.2" />
+   <PackageReference Include="Microsoft.Extensions.Caching.Abstractions" Version="9.0.0-preview.1.24080.9" />
+   <PackageReference Include="System.Net.Http.Json" Version="9.0.0-preview.1.24080.9" />
</ItemGroup>
```

## Blazor

[!INCLUDE[](~/migration/80-to-90/includes/blazor.md)]

## Additional resources