KB5081278

.NET 9.0 Update - March 10, 2026

.NET 9.0 has been refreshed with the latest update as of March 10, 2026. This update contains security fixes. See the release notes for details about updated packages.

.NET 9.0 servicing updates are upgrades. The latest servicing update for 9.0 will remove the previous 9.0 update upon successful installation. For example, when the .NET 9.0.14 is installed .NET 9.0.13 version will be removed from the computer if it's present.

How to obtain and install the update

This update is available on Microsoft Update for Windows client operating systems and available on WSUS and MU Catalog for Windows Server operating systems.

Prerequisites

This update will be offered if you have .NET 9.0 installed on a supported version of Windows.

Restart Requirement

You may need to restart the computer after you apply this update if any affected files are being used. We recommend that you exit all .NET based applications before you apply this update.

Supported Windows Versions

This page on .NET 9.0 Supported Windows Versions provides the most up-to-date details on the supported operating system versions.

.NET Support Lifecycle

This page on .NET Core and .NET 9 Support Policy provides the most up-to-date details on .NET Core Support Lifecycle Policy.

How to obtain help and support for this update

Microsoft Support

For assisted support with .NET Core technologies, [contact a Microsoft Support...