Read Consistency in Step Functions

State machine updates in AWS Step Functions are eventually consistent. All StartExecution calls within a few seconds will use the updated definition and roleArn (the Amazon Resource Name for the IAM role). Executions started immediately after calling UpdateStateMachine might use the previous state machine definition and roleArn.

For more information, see the following:

UpdateStateMachine in the AWS Step Functions API Reference
Step 3: Update a state machine in Getting started with AWS Step Functions

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Invoke Step Functions

Templates in Step Functions