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feat: bump to 4.2.2 #234

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anzheyazzz merged 1 commit into from
Oct 15, 2026
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feat: bump to 4.2.2 #234

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4 changes: 4 additions & 0 deletions RELEASE.CHANGELOG.md
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### October 15, 2026
`4.2.2`
- Pin the worker process start method to `fork` in multi-concurrent (Lambda Managed Instances) mode instead of inheriting the interpreter default, which changed from `fork` to `forkserver` in Python 3.14. Workers are now direct children of the runtime process on every supported Python version ([#233](https://github.com/aws/aws-lambda-python-runtime-interface-client/pull/233)). No behavior change on Python 3.13 and earlier; no impact on the standard on-demand path.

### October 13, 2026
`4.2.1`
- Revert pre-fork hooks for multi-concurrent (Lambda Managed Instances) mode introduced in `4.1.0` ([#226](https://github.com/aws/aws-lambda-python-runtime-interface-client/pull/226)), as the change was breaking. The `awslambdaric.lambda_concurrency_hooks` module, the `@register_pre_fork` decorator and the `Runtime.PreForkError` error type are removed, restoring the `4.0.4` multi-concurrent startup behavior. No impact on the standard on-demand path.
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2 changes: 1 addition & 1 deletion awslambdaric/__init__.py
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Copyright 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
"""

__version__ = "4.2.1"
__version__ = "4.2.2"
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