Sourced from aws-lambda-powertools's releases.

v3.16.0

Summary

We are thrilled to announce that Powertools for AWS Lambda (Python) now offers AWS Lambda layers in the AWS China region cn-north-1.

New AWS China Lambda Layer ARNs

You can now use Powertools for AWS Lambda (Python) Lambda layers in the AWS China regions, enhancing customer experience by making our pre-packaged Lambda layers available in this AWS partition.

To take advantage of the new layers, you need to update your functions or deployment setup to include one of the new Lambda layer ARN from the table below:

AWS China (cn-north-1)

Architecture	Layer ARN
x86_64	arn:aws-cn:lambda:cn-north-1:498634801083:layer:AWSLambdaPowertoolsPythonV3-{python_version}-x86_64:{version}
ARM	arn:aws-cn:lambda:cn-north-1:498634801083:layer:AWSLambdaPowertoolsPythonV3-{python_version}-arm64:{version}

Changes

🌟New features and non-breaking changes

• feat(ci): Partition workflow scripts updated to work (#6900) by @​sthulb
• feat(ci): Deploy to AWS China partitions (#6867) by @​sthulb

📜 Documentation updates

• docs(event-handler): remove Amplify transformers section (#6937) by @​dreamorosi
• docs(kafka): refactor kafka documentation (#6854) by @​leandrodamascena

🐛 Bug and hot fixes

• fix(logger): caplog working with parent Logger (#6847) by @​amin-farjadi
• fix(event_source): fix decode headers with signed bytes (#6878) by @​leandrodamascena
• fix(logger): fix exception on flush without buffer (#6794) by @​tonnico

🔧 Maintenance

• chore(deps-dev): bump boto3-stubs from 1.39.2 to 1.39.3 (#6940) by @dependabot[bot]
• chore(deps-dev): bump coverage from 7.9.1 to 7.9.2 (#6941) by @dependabot[bot]
• chore(deps-dev): bump aws-cdk from 2.1020.1 to 2.1020.2 (#6942) by @dependabot[bot]
• chore(deps-dev): bump ruff from 0.12.1 to 0.12.2 (#6938) by @dependabot[bot]
• chore(deps-dev): bump types-protobuf from 6.30.2.20250516 to 6.30.2.20250703 (#6939) by @dependabot[bot]
• chore(deps): bump aws-encryption-sdk from 4.0.1 to 4.0.2 (#6932) by @dependabot[bot]
• chore(deps): bump mkdocs-material from 9.6.14 to 9.6.15 (#6931) by @dependabot[bot]
• chore(deps-dev): bump aws-cdk-aws-lambda-python-alpha from 2.203.0a0 to 2.203.1a0 (#6929) by @dependabot[bot]
• chore(deps-dev): bump aws-cdk-lib from 2.203.0 to 2.203.1 (#6928) by @dependabot[bot]
• chore(deps-dev): bump boto3-stubs from 1.39.1 to 1.39.2 (#6930) by @dependabot[bot]
• chore(deps-dev): bump aws-cdk from 2.1020.0 to 2.1020.1 (#6927) by @dependabot[bot]
• chore(ci): incorporate SSM update workflow into release pipeline (#6914) by @​leandrodamascena

... (truncated)

Sourced from aws-lambda-powertools's changelog.

[v3.16.0] - 2025-07-02

Bug Fixes

• event_source: fix decode headers with signed bytes (#6878)
• logger: caplog working with parent Logger (#6847)
• logger: fix exception on flush without buffer (#6794)

Documentation

• kafka: refactor kafka documentation (#6854)

Features

• ci: Partition workflow scripts updated to work (#6900)
• ci: Deploy to AWS China partitions (#6867)

Maintenance

• version bump
• ci: new pre-release 3.15.2a6 (#6923)
• ci: incorporate SSM update workflow into release pipeline (#6914)
• ci: new pre-release 3.15.2a3 (#6876)
• ci: new pre-release 3.15.2a2 (#6865)
• ci: new pre-release 3.15.2a5 (#6910)
• ci: new pre-release 3.15.2a4 (#6881)
• ci: pinning versions in actions + refactor tests (#6904)
• ci: stop publishing to gh-pages branch (#6903)
• ci: stop publishing to gh-pages branch (#6902)
• ci: stop publishing to gh-pages branch (#6901)
• ci: stop publishing to gh-pages branch (#6899)
• ci: remove v2 deployment files (#6895)
• ci: bump urllib3 version (#6893)
• ci: new pre-release 3.15.2a0 (#6852)
• ci: refactor thread safe tests (#6889)
• ci: new pre-release 3.15.2a1 (#6860)
• ci: fix command to replace layer number (#6868)
• deps: bump docker/setup-buildx-action from 3.10.0 to 3.11.1 (#6823)
• deps: bump pydantic from 2.11.5 to 2.11.7 (#6844)
• deps: bump mkdocs-material from 9.6.14 to 9.6.15 in /docs (#6920)
• deps: bump redis from 5.3.0 to 6.2.0 (#6827)
• deps: bump pydantic-settings from 2.9.1 to 2.10.1 (#6872)
• deps: bump datadog-lambda from 6.110.0 to 6.111.0 (#6857)
• deps: bump valkey-glide from 1.3.5 to 2.0.1 (#6871)
• deps: bump squidfunk/mkdocs-material from eb04b60 to 0bfdba4 in /docs (#6915)
• deps: bump mkdocs-material from 9.5.50 to 9.6.14 in /docs (#6908)
• deps-dev: bump sentry-sdk from 2.29.1 to 2.31.0 (#6870)
• deps-dev: bump aws-cdk from 2.1019.1 to 2.1019.2 (#6875)
• deps-dev: bump pytest from 8.4.0 to 8.4.1 (#6874)
• deps-dev: bump cfn-lint from 1.35.4 to 1.36.1 (#6855)
• deps-dev: bump boto3-stubs from 1.38.42 to 1.38.43 (#6864)

... (truncated)

Sourced from aws-lambda-powertools's upgrade guide.

---

title: Upgrade guide description: Guide to update between major Powertools for AWS Lambda (Python) versions

End of support v2

!!! warning "On March 25st, 2025, Powertools for AWS Lambda (Python) v2 reached end of support and will no longer receive updates or releases. If you are still using v2, we strongly recommend you to read our upgrade guide and update to the latest version."

Given our commitment to all of our customers using Powertools for AWS Lambda (Python), we will keep Pypi{target="_blank"} v2 releases and documentation 2.x versions to prevent any disruption.

Migrate to v3 from v2

!!! info "We strongly encourage you to migrate to v3. However, if you still need to upgrade from v1 to v2, you can find the upgrade guide."

We've made minimal breaking changes to make your transition to v3 as smooth as possible.

Quick summary

Area	Change	Code change required
Pydantic	We have removed support for Pydantic v1	No
Parser	We have replaced DynamoDBStreamModel AttributeValue with native Python types	Yes
Parser	We no longer export Pydantic objects from parser.pydantic.	Yes
Lambda layer	Lambda layers are now compiled according to the specific Python version and architecture	No
Event Handler	We have deprecated the get_header_value function.	Yes
Batch Processor	@batch_processor and @async_batch_processor decorators are now deprecated	Yes
Event Source Data Classes	We have updated default values for optional fields.	Yes
Parameters	The default cache TTL is now set to 5 minutes	No
Parameters	The config parameter is deprecated in favor of boto_config	Yes
JMESPath Functions	The extract_data_from_envelope function is deprecated in favor of query	Yes
Types file	We have removed the type imports from the shared/types.py file	Yes

First Steps

Before you start, we suggest making a copy of your current working project or create a new branch with git.

1. Upgrade Python to at least v3.9.
2. Ensure you have the latest version via Lambda Layer or PyPi{target="_blank"}.
3. Review the following sections to confirm if you need to make changes to your code.

Drop support for Pydantic v1

!!! note "No code changes required"

As of June 30, 2024, Pydantic v1 has reached its end-of-life, and we have discontinued support for this version. We now exclusively support Pydantic v2.

Use Pydantic v2 Migration Guide{target="_blank"} to migrate your custom Pydantic models to v2.

... (truncated)

• ce5fad6 chore: version bump
• df52248 chore(ci): changelog rebuild (#6924)
• b66edac chore(ci): new pre-release 3.15.2a6 (#6923)
• 5e3e85b chore(ci): incorporate SSM update workflow into release pipeline (#6914)
• 852650f chore(deps-dev): bump cfn-lint from 1.36.1 to 1.37.0 (#6918)
• 60d794f chore(deps-dev): bump aws-cdk from 2.1019.2 to 2.1020.0 (#6917)
• b6a924a chore(deps-dev): bump boto3-stubs from 1.39.0 to 1.39.1 (#6916)
• 46a2bd7 chore(deps-dev): bump aws-cdk-aws-lambda-python-alpha from 2.202.0a0 to 2.203...
• 75bdc4f chore(deps-dev): bump pytest-xdist from 3.7.0 to 3.8.0 (#6921)
• c393f54 chore(deps): bump mkdocs-material from 9.6.14 to 9.6.15 in /docs (#6920)
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