AWS Updates SAM CLI with Expanded CloudFormation Support for Serverless Development

Amazon Web Services has introduced updates to the AWS Serverless Application Model (SAM) CLI, expanding support for AWS CloudFormation in serverless development environments. The enhancements are designed to improve how developers build, test and deploy serverless applications using infrastructure-as-code workflows. The updated capabilities provide tighter integration with CloudFormation, allowing teams to manage resources and application stacks more consistently across development and production environments.

SAM CLI processes Language Extensions in memory for local operations while preserving your original template for CloudFormation deployment. This update shortens your iteration cycles and reduces time spent debugging failed deployments in the cloud.

AWS said the changes aim to streamline deployment processes and reduce operational complexity for developers working with serverless architectures. The SAM CLI is widely used to package and deploy applications running on AWS services such as Lambda and API Gateway. To get started, download or update SAM CLI to the latest version. Add the AWS::LanguageExtensions transform to your SAM template and use Fn::ForEach to generate multiple resources from a single definition.

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Posted by AWS Editors on 05/18/2026