We are making an update to App Service to support .NET Framework 4.8. You will soon be able to take advantage of the .NET Framework updated toolset, bug fixes and key improvements in accessibility and runtime. For the full list of updates and changes see the anouncement and release notes. The update is coming to App Service starting deployment in July 14, 2020 and completing by September 15, 2020. In preparation for your application update to .NET Framework 4.8 we recommend that you test your applications locally in advance.

To track progress during the deployment, we will be posting periodic updates here.

Test your application locally by reviewing the Migration guide, and completing the following steps:

1. Download & install .NET Framework 4.8 for your appropriate scenario here.
2. See the Runtime changes and Retargeting guide to check for application compatibility issues that may affect your application.
3. Run the application in your local browser and verify the application features.

If you have issues with your application, feedback can be given on GitHub.

To see if your apps have been updated after we begin the platform update, check which .NET Framework version is in use by using the Console feature under Development Tools in the App Service blade of your Azure Portal.

1. Run the following command: cd "\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework" .

2. Run the dir command to list out the installed versions of .NET Framework.
   

3. If .NET Framework 4.8 is installed, it will be located at D:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.8