Lambda functions should use supported runtimes

How to fix it

• Can break clients: Code written for the old runtime can fail on the new one, so test the function on the new runtime before production traffic reaches it.

In the console

Lambda → Functions → the function → Code → Runtime settings

Runtime

A runtime from the Supported runtimes table of the Lambda runtimes page, for the function's language

Aliases

Publish a new version and point each alias at it; published versions keep the old runtime

With the AWS CLI

aws lambda update-function-configuration --function-name <function-name> --runtime <supported-runtime> --region <region>

With Terraform

resource "aws_lambda_function" "this" {
  function_name = var.function_name
  role          = var.execution_role_arn
  filename      = var.deployment_package
  runtime       = var.supported_runtime
}