Introducing public preview runtimes on AWS Lambda, starting with Node.js 26 and Python 3.15
AWS Lambda ยท 2026-08-15
Actions
Technical Details
| Affected Versions | Node.js 26, Python 3.15 |
|---|---|
| Regions | all |
| Breaking Change | Yes |
| Cost Impact | Neutral |
| IaC Impact | High |
What This Means
For DevOps Teams
Update your Lambda functions to use the Node.js 26 and Python 3.15 preview runtimes to test new language features and provide feedback, noting that these runtimes may have breaking changes and are not recommended for production workloads.
For Platform Teams
Adopt the Node.js 26 and Python 3.15 preview runtimes to integrate and test new language capabilities, helping to ensure that future Lambda runtimes are optimized and stable for production use.
For Executives
Evaluate the public preview runtimes for Node.js 26 and Python 3.15 to gain early access to upcoming language features and contribute to improving the stability and performance of future AWS Lambda runtimes before their general availability.
Source
Related AWS Lambda Updates
- AWS Lambda announces scalable network bandwidth up to 3,000 Mbps for functions outside a VPC (2026-08-05)
- Announcing response streaming for .NET on AWS Lambda (2026-08-05)
- AWS Lambda Provisioned Mode for Amazon SQS event source mappings now supports up to 10,000 event pollers (2026-08-03)
- AWS Durable Execution SDK for .NET now Generally Available (2026-08-03)
- AWS Lambda now supports Java 8, 11, and 17 on Amazon Linux 2023 (2026-07-31)