Release v1.56.3

What's Changed

• fix W1028: scope to enclosing Fn::If pins by @kddejong in #4690
• fix E1017: report out-of-bounds Fn::Select on a literal list by @kddejong in #4695
• fix E1010: report clean error for Fn::GetAtt string form without an attribute by @kddejong in #4696
• Update CloudFormation schemas to 2026-09-10 by @github-actions[bot] in #4691
• fix W1101: resolved Fn::FindInMap should not share identity (W1101 false positive) by @kddejong in #4698

Full Changelog: v1.56.2...v1.56.3

Release v1.56.2

What's Changed

• fix: Allow intrinsics in SAM Globals properties by @kddejong in #4683
• add E3717: Lambda Timeout limit based on CapacityProviderConfig by @kddejong in #4685
• fix E2529: Raise CloudWatch Logs subscription filter limit to 5 by @kddejong in #4688
• Avoid maxProperties warnings for single-property schemas by @0xTaoZ in #4686
• Allow Fn::GetAZs in Fn::Join values by @0xTaoZ in #4677

Full Changelog: v1.56.1...v1.56.2

Release v1.56.1

What's Changed

• fix(ecs): Support 32 vCPU Fargate task definitions by @kddejong in #4668
• Guard against YAML alias amplification (billion laughs) by @kddejong in #4670
• fix: Type-check resource Refs in UpdatePolicy/CreationPolicy by @kddejong in #4676
• Update CloudFormation schemas to 2026-09-08 by @github-actions[bot] in #4667

Full Changelog: v1.56.0...v1.56.1

Release v1.56.0

What's Changed

• test(functions): assert FindInMap rejects non-DefaultValue 4th item without transform by @kddejong in #4639
• fix: Prevent path traversal in nested stack TemplateURL resolution by @kddejong in #4640
• fix: Require object for CreationPolicy and UpdatePolicy by @kddejong in #4641
• Fix E1010 resolve GetAtt to SAM generated resources by @kddejong in #4646
• chore(deps): bump pyinstaller from 6.21.0 to 6.22.1 in /requirements by @dependabot[bot] in #4647
• docs: add inspect.software health badge by @Nayjest in #4648
• Add AutoScalingInstanceRefresh to the UpdatePolicy schema by @ktrysmt in #4656
• chore(deps): bump pyinstaller from 6.22.1 to 6.22.2 in /requirements by @dependabot[bot] in #4650
• Update CloudFormation schemas to 2026-08-28 by @github-actions[bot] in #4637
• Fix E3016: Reject AutoScalingInstanceRefresh with AutoScalingRollingUpdate by @kddejong in #4661
• fix: Defer schema metadata updates until install succeeds by @Fail-Safe in #4662
• chore: Remove unused caching path from get_url_retrieve by @kddejong in #4663
• Allow GetAtt outputs on SAM applications by @0xTaoZ in #4665
• Update CloudFormation schemas to 2026-08-31 by @github-actions[bot] in #4664

New Contributors

• @Nayjest made their first contribution in #4648
• @ktrysmt made their first contribution in #4656
• @Fail-Safe made their first contribution in #4662

Full Changelog: v1.55.1...v1.56.0

Release v1.55.1

What's Changed

• chore(deps): bump setuptools from 83.0.0 to 84.0.0 in /requirements by @dependabot[bot] in #4630
• E3005: skip DependsOn validation for SAM/MODULE sub-resources by @kddejong in #4632
• fix(functions): allow FindInMap DefaultValue without transform by @0xTaoZ in #4628
• fix(schema): retry transient network errors when downloading schemas by @kddejong in #4633
• Update CloudFormation schemas to 2026-08-13 by @github-actions[bot] in #4626

Full Changelog: v1.55.0...v1.55.1

Release v1.55.0

What's Changed

• Update E3043 for Serverless::Application by @kddejong in #4617
• Update W2533 Handler/Runtime on Zip Serverless::Function by @kddejong in #4618
• Update W2530 SnapStart support for Serverless::Function by @kddejong in #4616
• Update E3724 to validate IgnoreGlobals keys by @kddejong in #4615
• Update E2529 count SAM CloudWatchLogs events by @kddejong in #4614
• Validate Fn::Select negative indexes by @0xTaoZ in #4622
• New rule W3001 to warn for ignored SAM resource attributes by @0xTaoZ in #4620
• test(W3001): cover guard branches and remove dead code by @kddejong in #4624
• Update CloudFormation schemas to 2026-08-11 by @github-actions[bot] in #4602

Full Changelog: v1.54.0...v1.55.0

Release v1.54.0

What's Changed

• fix(ec2): Allow FromPort/ToPort for ICMPv6 in W3687 by @kddejong in #4600
• Remove SAM translator dependency, validate SAM templates via schemas by @kddejong in #4491
• Update CloudFormation schemas to 2026-08-04 by @github-actions[bot] in #4601

Full Changelog: v1.53.3...v1.54.0

Release v1.53.3

What's Changed

• Cache RefResolver subschemas lookup per instance by @sir-sigurd in #4590
• chore(deps): bump pyinstaller from 6.20.0 to 6.21.0 in /requirements by @dependabot[bot] in #4595
• chore(deps): bump setuptools from 82.0.1 to 83.0.0 in /requirements by @dependabot[bot] in #4593
• fix(E3701): Prevent false positive for Fn::If in OutputArtifacts Name by @kddejong in #4596
• fix(schema): Add file locking to prevent concurrent cache corruption by @kddejong in #4598
• Update CloudFormation schemas to 2026-07-28 by @github-actions[bot] in #4589

Full Changelog: v1.53.2...v1.53.3

Release v1.53.2

What's Changed

• Compute Context.module_names lazily to avoid rescan on every evolve() by @sir-sigurd in #4586
• Update CloudFormation schemas to 2026-07-23 by @github-actions[bot] in #4583

New Contributors

• @sir-sigurd made their first contribution in #4586

Full Changelog: v1.53.1...v1.53.2

Release v1.53.1

What's Changed

• Update snapshot script results file naming so that templates with sam… by @satyakigh in #4575
• fix: Don't error on FindInMap keys resolved from parameter defaults by @kddejong in #4580
• chore(deps): bump actions/setup-python from 6 to 7 by @dependabot[bot] in #4581
• Update CloudFormation schemas to 2026-07-20 by @github-actions[bot] in #4576

Full Changelog: v1.53.0...v1.53.1