Announcing the LocalStack for AWS 2026.05.0 Release

LocalStack for AWS 2026.05.0 introduces significant updates, including support for AWS Batch Multi-Node Parallel (MNP) job execution, enabling complex distributed workloads across multiple nodes. It also offers self-managed EC2 nodes joining emulated EKS clusters on AmazonLinux2023 with early use cases like Karpenter autoscaling, and expands AWS Replicator coverage to include Organizations, S3 buckets, DynamoDB tables, and RDS clusters. The release transitions the base Docker image to Debian sid to address OS-level vulnerabilities, enhances CloudFormation and IAM enforcement, and reorganizes Docker image tags for better stability and development tracking. Additionally, the update enhances ECS provider functionalities, improves IAM enforcement to reduce false AccessDenied errors, and supports new AWS features like Ruby 4.0 Lambda runtime and full CRUD support for certain CloudFormation resources. These enhancements collectively aim to close existing gaps in AWS coverage, improve system reliability, and ensure smoother integration and operation for users leveraging LocalStack for AWS emulation and testing.