Migration guide: 14.x to 15.0

Release notes.

MediatR now targets .NET 10, .NET 11, .NET Standard 2.0 and .NET Framework 4.6.2

The net8.0 and net9.0 builds have been removed, because both versions of .NET reach end of support in November 2026. MediatR.Contracts still targets netstandard2.0 only.

Apps on .NET 8 or .NET 9 can still install this package, and they get the netstandard2.0 build, which has the same public API. We recommend moving to .NET 10 or later.

Supported versions

Security fixes are provided for the current and previous major versions. With this release, those are 15.x and 14.x, and 13.x is no longer supported.