.NET 9 (STS): sunset date 2026-11-10
The sunset date for .NET 9 (STS) is 2026-11-10, which is 31 days after 2026-10-10, the date this data was compiled.
- Provider
- Microsoft
- Category
- language-runtime
- Sunset date
- 2026-11-10 (31 days remaining as of 2026-10-10)
- What stops working
- .NET 9 reaches end of support and stops receiving security and bug fixes.
- Replacement
- .NET 10 (LTS)
Source
dotnet/core releases-index.json (github.com). Read on 2026-10-10. Confirm the date there before acting.
Related sunsets
- .NET 8 (LTS) (2026-11-10)
- AWS Lambda .NET 8 (2026-11-10)
- Node.js 22 (2027-04-30)