AWS 14 days
AWS Lambda .NET 9 (container only) (dotnet9) end of life (runtime deprecation)
By November 10, 2026: migrate functions to dotnet10. After that, .NET 9 (container only) (dotnet9) on AWS Lambda is still yours to run; it just isn't anyone's job to patch. Source: docs.aws.amazon.com, checked 2026-10-17.
- What's retiring
- .NET 9 (container only) (dotnet9) runtime deprecation (AWS Lambda)
- When
- November 10, 2026
- Days left
- 14 days left, as of 2026-10-27.
- What happens
- No more security patches or support. AWS lists block function create and block function update for dotnet9 as 'Not scheduled'.
- What to do
- Migrate functions to dotnet10.
- Kind of change
- Runtime end of life
- Official source
- docs.aws.amazon.com ↗ (last checked 2026-10-17)
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Providers move dates. Check the official source before you plan a migration around this one.