
What Happens to Your Applications When .NET 8 and .NET 9 Support Ends in November 2026?
On November 10, 2026, Microsoft ends support for both .NET 8 (LTS) and .NET 9 (STS) on the same day, a rare convergence caused by Microsoft extending Standard Term Support from 18 to 24 months. Your applications won’t stop running, but they’ll stop receiving security patches, bug fixes, and technical support. The safest upgrade path is .NET 10, which secures your environment with LTS support through November 2028. Avoid stalling for .NET 11; even though it drops that same month, it will not be production-ready on day one. The November 10, 2026 Deadline: Understanding the .NET Lifecycle Convergence This is





