AWS Lambda now supports creating serverless applications using Ruby 4.0. Developers can use Ruby 4.0 as both a managed runtime and a container base image, and AWS will automatically apply updates to the managed runtime and base image as they become available. Ruby 4.0 is the latest long-term support (LTS) release of Ruby and is expected to be supported for security and bug fixes until March 2029. In addition to providing access to the latest Ruby language features, the Lambda Runtime for Ruby 4.0 also adds support for Lambda advanced logging controls , providing customers with JSON structured logs, configurable logging levels, and the ability to configure the target Amazon CloudWatch log group. The Ruby 4.0 runtime is available in all AWS Regions, including China Regions and the AWS GovCloud (US) Regions. You can use the full range of AWS deployment tools, including the Lambda console, AWS CLI, AWS Serverless Application Model (AWS SAM), CDK, and AWS CloudFormation to deploy and manage serverless applications written in Ruby 4.0. For more information on using Ruby 4.0 in Lambda, see our documentation . For more information about AWS Lambda, visit our product page .