Updating Prefect variables within a flow can depend on what you mean by "variables." In the context of Prefect, if you're referring to parameters or any other values that control the execution of tasks and flows, you can manage these values through task inputs and outputs or by using a form of state management.
However, the documents returned don't seem to provide clear instructions on how you can update or modify variables during the execution of a flow. Prefect variables aren't a specific concept within Prefect's core API, so there might be a need to clarify how you're managing these variables within your workflow.
To find the precise information you may need, consider either referring to a more specific use case (like how to work with parameters or tasks' return values to pass data around in a flow) or check for information directly related to state management within Prefect.
For more detailed guidance, I recommend checking the official Prefect documentation at
Prefect Docs or joining Prefect's community on Slack for support from other users and contributors, as the direct search didn't yield a specific answer.
Another option is to use the Prefect Context or Parameters for passing inputs into a flow at runtime; these can be updated each time the flow is run. To understand better how to work with these, you might need help from more specific examples or reach out to the Prefect community for guidance.