Merge pull request #236 from anzheyazzz/remove-py315-preview

Remove python3.15 preview warning and bump version to 4.2.3

Author: anzheyazzz

RELEASE.CHANGELOG.md

@@ -1,3 +1,7 @@
+### October 27, 2026
+`4.2.3`
+- Remove `AWS_Lambda_python3.15` from the preview runtime list so the preview warning is no longer emitted on Python 3.15 ([#236](https://github.com/aws/aws-lambda-python-runtime-interface-client/pull/236)).
+
 ### 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.

awslambdaric/__init__.py

@@ -2,4 +2,4 @@
 Copyright 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 """
 
-__version__ = "4.2.2"
+__version__ = "4.2.3"

awslambdaric/bootstrap.py

@@ -478,7 +478,7 @@ def _setup_logging(log_format, log_level, log_sink):
     logger.addHandler(logger_handler)
 
 
-PREVIEW_RUNTIME_ENVS = {"AWS_Lambda_python3.15"}
+PREVIEW_RUNTIME_ENVS = set()
 
 
 def _log_preview_runtime_warning():