**To update a Maintenance Window task**

This example updates the service role for a Maintenance Window task.

Command::

  aws ssm update-maintenance-window-task --window-id "mw-0c5ed765acEXAMPLE" --window-task-id "23d3809e-9fbe-4ddf-b41a-b49d7EXAMPLE" --service-role-arn "arn:aws:iam::111222333444:role/aws-service-role/ssm.amazonaws.com/AWSServiceRoleForAmazonSSM"

Output::

  {
    "ServiceRoleArn": "arn:aws:iam::111222333444:role/aws-service-role/ssm.amazonaws.com/AWSServiceRoleForAmazonSSM",
    "MaxErrors": "1",
    "TaskArn": "AWS-UpdateEC2Config",
    "MaxConcurrency": "1",
    "WindowTaskId": "23d3809e-9fbe-4ddf-b41a-b49d7EXAMPLE",
    "TaskParameters": {},
    "Priority": 1,
    "TaskInvocationParameters": {
        "RunCommand": {
            "TimeoutSeconds": 600,
            "Parameters": {
                "allowDowngrade": [
                    "false"
                ]
            }
        }
    },
    "WindowId": "mw-0c5ed765acEXAMPLE",
    "Description": "UpdateEC2Config",
    "Targets": [
        {
            "Values": [
                "57e8344e-fe64-4023-8191-6bf05EXAMPLE"
            ],
            "Key": "WindowTargetIds"
        }
    ],
    "Name": "UpdateEC2Config"
  }