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

Release v1.53.0

What's Changed

• fix: Restore pricing and AWS API scripts, fix Elasticsearch instance type enum by @kddejong in #4569
• Update CloudFormation schemas to 2026-07-06 by @github-actions[bot] in #4562
• fix: Move schema cache to platform-appropriate user directory by @kddejong in #4571
• feat: Add version.json schema precedence and bundled fallback by @kddejong in #4573
• Fix shared pricing defaults by @0xTaoZ in #4572
• Update CloudFormation schemas to 2026-07-09 by @github-actions[bot] in #4570

New Contributors

• @0xTaoZ made their first contribution in #4572

Full Changelog: v1.52.1...v1.53.0

Release v1.52.1

What's Changed

• fix: Auto-download schemas when not present for pre-commit users by @kddejong in #4558
• Update CloudFormation schemas to 2026-06-26 by @github-actions[bot] in #4554
• Update CloudFormation schemas to 2026-06-29 by @github-actions[bot] in #4559

New Contributors

• @johnanand707 made their first contribution in #4527

Full Changelog: v1.52.0...v1.52.1

Release v1.52.0

What's Changed

• Source schemas from enhanced-schemas repo instead of local patching by @kddejong in #4539
• fix: LanguageExtensions transform preserves Fn::Sub with underscore variables by @kddejong in #4548
• fix: Resolve false positives for dead config properties by @kddejong in #4550
• chore(deps): bump actions/checkout from 6 to 7 by @dependabot[bot] in #4552
• Update CloudFormation schemas to 2026-06-22 by @github-actions[bot] in #4549
• fix: Add static test schemas so unit tests pass without cfn-lint -u by @kddejong in #4553

Full Changelog: v1.51.5...v1.52.0

Release v1.51.5

What's Changed

• fix: Correct schema false positives for ElastiCache and IAM by @kddejong in #4540
• chore(deps): bump codecov/codecov-action from 6 to 7 by @dependabot[bot] in #4541
• fix: Allow decimal values in Logs MetricFilter MetricValue pattern by @kddejong in #4542
• Update CloudFormation schemas to 2026-06-12 by @github-actions[bot] in #4538
• fix: Make EC2::TrafficMirrorFilterRule TrafficDirection case-insensitive by @kddejong in #4543
• Update CloudFormation schemas to 2026-06-15 by @github-actions[bot] in #4544

Full Changelog: v1.51.4...v1.51.5

Release v1.51.4

What's Changed

• fix: E3042 false positive when Essential is omitted from ECS containers by @kddejong in #4536
• Update CloudFormation schemas to 2026-06-03 by @github-actions[bot] in #4534

Full Changelog: v1.51.3...v1.51.4

Release v1.51.3

What's Changed

• fix: Allow ProvisionedThroughput with 0 values when BillingMode is PAY_PER_REQUEST by @kddejong in #4524
• Revert: S3 bucket names with uppercase should remain an error by @kddejong in #4528
• fix: Allow ARN format for Lambda FunctionName property by @kddejong in #4529
• feat: Add OpenSearch instance type validation from pricing API by @kddejong in #4525
• fix: Sync update_schemas_manually.py with committed manual.json files by @kddejong in #4530
• Update CloudFormation schemas to 2026-06-02 by @github-actions[bot] in #4523
• fix: Update Lambda runtime lifecycle dates from AWS docs by @kddejong in #4532

Full Changelog: v1.51.2...v1.51.3