"Microsoft announced an extension to its .NET Standard Term Support releases from 18 months to 24 months, as reported on the company's official development blog. The policy change, effective with .NET 9, will extend support for the latest release until November 10, 2026, matching the end-of-support date for .NET 8, a Long Term Support version. As stated by Microsoft, the company will maintain its established annual release schedule each November."
"The technology company identified dependency management challenges as the primary motivation for this modification. As stated in the announcement, out-of-band releases such as . NET Aspire, Microsoft.Extensions.AI, and C# Dev Kit occasionally require updated package versions from newer annual releases. This situation created complications for enterprises adhering to LTS-only policies, as they could inadvertently incorporate STS components when installing these out-of-band releases, potentially reducing their support timeline."
Microsoft extended Standard Term Support (STS) from 18 to 24 months beginning with .NET 9, moving end-of-support for .NET 9 to November 10, 2026, to match .NET 8 LTS. The established annual November release cadence remains in place, with even-numbered releases continuing as Long Term Support (three years) and odd-numbered releases as STS. Dependency management challenges, especially out-of-band releases that require newer package versions (for example, .NET Aspire, Microsoft.Extensions.AI, and C# Dev Kit), motivated the change. The extension reduces the risk that organizations on LTS-only policies will inadvertently adopt STS components and shorten support timelines.
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