Sourced from aws-cdk-lib's releases.

v2.251.0

⚠ BREAKING CHANGES

• ** L1 resources are automatically generated from public CloudFormation Resource Schemas. They are built to closely reflect the real state of CloudFormation. Sometimes these updates can contain changes that are incompatible with previous types, but more accurately reflect reality. In this release we have changed:

aws-elasticloadbalancing: AWS::ElasticLoadBalancing::LoadBalancer: SourceSecurityGroup attribute removed. aws-elasticloadbalancing: AWS::ElasticLoadBalancing::LoadBalancer: PolicyItem type removed. aws-elasticloadbalancing: AWS::ElasticLoadBalancing::LoadBalancer: SourceSecurityGroup type removed.

Features

• update L1 CloudFormation resource definitions (#37684) (9e6c2ef)
• lambda: add ruby 4.0 runtime (#37650) (04d4337)
• update L1 CloudFormation resource definitions (#37644) (e64f943)
• core: Validations class is the new way to add validation plugins to CDK Apps (#37611) (95696b4), closes #37613
• core: graduate policyValidationBeta1 interfaces to policyValidation (#37613) (8c613cf)
• ecs: support for service connect access log configuration (#36067) (5ad1c06)
• route53: accelerated recovery for public hosted zone (#36358) (f1b7b03)
• synthetics: support canary group (#35689) (20ccd31), closes #34043

Bug Fixes

• core: Stage.policyValidationBeta1 is mutable (#37612) (3c1faf1)
• core: construct creation stack traces are implicit (#37643) (5635c20)
• core: synth output is not valid YAML when using policy validation (#37597) (927dd60), closes #25331
• core: token stack traces expensively clutter --debug mode (#37642) (498c546)
• core: tree metadata does not contain logical ID (#37630) (284ab23)
• ec2: fixing vpc endpoint for eu-isoe-west-1 region (#37596) (555c930), closes #31690
• events-targets: make LogGroupTargetInput extend RuleTargetInput for JSII compatibility (#37451) (46dbc7a), closes #36733
• lambda: add Token.isUnresolved checks to provisioned poller config validation (#37197) (667ed30)
• stepfunctions-tasks: warn when CallAwsServiceCrossRegion endpoint is resolved from state input (#37646) (9fdf590)

---

Alpha modules (2.251.0-alpha.0)

Features

• bedrock-agentcore-alpha: add L2 constructs for policy and policy engine (#37238) (1e89e7e)
• bedrock-agentcore-alpha: add observability configuration for Runtime (#36689) (34b43aa), closes #36596
• bedrock-agentcore-alpha: support No Authorization for AgentCore Gateway (#36610) (f20bd8e)
• dsql-alpha: initial L2 construct (#34599) (be1a458), closes #34593

Sourced from aws-cdk-lib's changelog.

Changelog

All notable changes to this project will be documented in this file. See standard-version for commit guidelines.

2.251.0-alpha.0 (2026-04-24)

Features

• bedrock-agentcore-alpha: add L2 constructs for policy and policy engine (#37238) (1e89e7e)
• bedrock-agentcore-alpha: add observability configuration for Runtime (#36689) (34b43aa), closes #36596
• bedrock-agentcore-alpha: support No Authorization for AgentCore Gateway (#36610) (f20bd8e)
• dsql-alpha: initial L2 construct (#34599) (be1a458), closes #34593

2.250.0-alpha.0 (2026-04-14)

2.249.0-alpha.0 (2026-04-10)

2.248.0-alpha.0 (2026-04-02)

2.247.0-alpha.0 (2026-04-02)

Features

• mediapackagev2-alpha: new L2 construct (#37279) (7debfb9)

2.246.0-alpha.0 (2026-03-31)

2.245.0-alpha.0 (2026-03-27)

Features

• s3tables-alpha: add support for partition spec, sort order, and table properties (#36811) (2696cd1)
• s3tables-alpha: add metrics configuration support for TableBucket (#37275) (e8786f5)
• s3tables-alpha: implement ITaggableV2 on TableBucket and Table L2 constructs (#37277) (69c8944), closes #33054

2.244.0-alpha.0 (2026-03-19)

Bug Fixes

• kinesisanalytics-flink-alpha: mark deprecated flink runtimes as deprecated (#37155) (0a89447)

2.243.0-alpha.0 (2026-03-11)

2.242.0-alpha.0 (2026-03-10)

... (truncated)

• c983471 chore(release): 2.251.0 (#37685)
• 07e9688 chore: update integration test snapshots for lambda-nodejs and lambda-python
• 4d4aff0 chore(release): remove revert entry from 2.251.0 changelog
• 928c10c chore: update lambda runtime integration tests
• b213cf6 chore(release): 2.251.0
• 9e6c2ef feat: update L1 CloudFormation resource definitions (#37684)
• cc273ef chore(deps): bump the npm_and_yarn group across 2 directories with 1 update (...
• 3f03193 chore: raise peerDependency of cloud-assembly-schema to fix dotnet build (#37...
• 9fdf590 fix(stepfunctions-tasks): warn when CallAwsServiceCrossRegion endpoint is res...
• 04d4337 feat(lambda): add ruby 4.0 runtime (#37650)
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