SFN / Client / update_state_machine



Updates an existing state machine by modifying its definition, roleArn, or loggingConfiguration. Running executions will continue to use the previous definition and roleArn. You must include at least one of definition or roleArn or you will receive a MissingRequiredParameter error.

A qualified state machine ARN refers to a Distributed Map state defined within a state machine. For example, the qualified state machine ARN arn:partition:states:region:account-id:stateMachine:stateMachineName/mapStateLabel refers to a Distributed Map state with a label mapStateLabel in the state machine named stateMachineName.

A qualified state machine ARN can either refer to a Distributed Map state defined within a state machine, a version ARN, or an alias ARN.

The following are some examples of qualified and unqualified state machine ARNs:

  • The following qualified state machine ARN refers to a Distributed Map state with a label mapStateLabel in a state machine named myStateMachine. arn:partition:states:region:account-id:stateMachine:myStateMachine/mapStateLabel


If you provide a qualified state machine ARN that refers to a Distributed Map state, the request fails with ValidationException.

  • The following qualified state machine ARN refers to an alias named PROD. arn:<partition>:states:<region>:<account-id>:stateMachine:<myStateMachine:PROD>


If you provide a qualified state machine ARN that refers to a version ARN or an alias ARN, the request starts execution for that version or alias.

  • The following unqualified state machine ARN refers to a state machine named myStateMachine. arn:<partition>:states:<region>:<account-id>:stateMachine:<myStateMachine>

After you update your state machine, you can set the publish parameter to true in the same action to publish a new version. This way, you can opt-in to strict versioning of your state machine.


Step Functions assigns monotonically increasing integers for state machine versions, starting at version number 1.


All StartExecution calls within a few seconds use the updated definition and roleArn. Executions started immediately after you call UpdateStateMachine may use the previous state machine definition and roleArn.

See also: AWS API Documentation

Request Syntax

response = client.update_state_machine(
        'level': 'ALL'|'ERROR'|'FATAL'|'OFF',
        'includeExecutionData': True|False,
        'destinations': [
                'cloudWatchLogsLogGroup': {
                    'logGroupArn': 'string'
        'enabled': True|False
  • stateMachineArn (string) –


    The Amazon Resource Name (ARN) of the state machine.

  • definition (string) – The Amazon States Language definition of the state machine. See Amazon States Language.

  • roleArn (string) – The Amazon Resource Name (ARN) of the IAM role of the state machine.

  • loggingConfiguration (dict) –

    Use the LoggingConfiguration data type to set CloudWatch Logs options.

    • level (string) –

      Defines which category of execution history events are logged.

    • includeExecutionData (boolean) –

      Determines whether execution data is included in your log. When set to false, data is excluded.

    • destinations (list) –

      An array of objects that describes where your execution history events will be logged. Limited to size 1. Required, if your log level is not set to OFF.

      • (dict) –

        • cloudWatchLogsLogGroup (dict) –

          An object describing a CloudWatch log group. For more information, see AWS::Logs::LogGroup in the CloudFormation User Guide.

          • logGroupArn (string) –

            The ARN of the the CloudWatch log group to which you want your logs emitted to. The ARN must end with :*

  • tracingConfiguration (dict) –

    Selects whether X-Ray tracing is enabled.

    • enabled (boolean) –

      When set to true, X-Ray tracing is enabled.

  • publish (boolean) – Specifies whether the state machine version is published. The default is false. To publish a version after updating the state machine, set publish to true.

  • versionDescription (string) –

    An optional description of the state machine version to publish.

    You can only specify the versionDescription parameter if you’ve set publish to true.

Return type:



Response Syntax

    'updateDate': datetime(2015, 1, 1),
    'revisionId': 'string',
    'stateMachineVersionArn': 'string'

Response Structure

  • (dict) –

    • updateDate (datetime) –

      The date and time the state machine was updated.

    • revisionId (string) –

      The revision identifier for the updated state machine.

    • stateMachineVersionArn (string) –

      The Amazon Resource Name (ARN) of the published state machine version.

      If the publish parameter isn’t set to true, this field returns null.


  • SFN.Client.exceptions.InvalidArn

  • SFN.Client.exceptions.InvalidDefinition

  • SFN.Client.exceptions.InvalidLoggingConfiguration

  • SFN.Client.exceptions.InvalidTracingConfiguration

  • SFN.Client.exceptions.MissingRequiredParameter

  • SFN.Client.exceptions.StateMachineDeleting

  • SFN.Client.exceptions.StateMachineDoesNotExist

  • SFN.Client.exceptions.ServiceQuotaExceededException

  • SFN.Client.exceptions.ConflictException

  • SFN.Client.exceptions.ValidationException