You can now shift incoming traffic between two AWS Lambda function versions based on pre-assigned weights. This allows you to gradually shift traffic between two versions, helping you reduce the risk and limit the blast radius of new Lambda deployments. You can now also use AWS CodeDeploy to automatically manage the rollout of new function versions. CodeDeploy is a service that automates software deployments to a variety of compute services like Lambda and Amazon EC2. CodeDeploy makes it easy to gradually and safely deploy updates to Lambda, and it is supported by the AWS Serverless Application Model.