How to clear the cache in SageMath worksheet?

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In the SageMath worksheet, in some of the cells I have:

  load ("myfile.sage")
  [run some functions from myfile.sage]

Sometimes it is loaded correctly, but sometimes, when I make some changes to myfile.sage, save and click "evaluate", I do not see the changes. It looks as if the old version of "myfile.sage" is kept somewhere, and the worksheet does not load the new version.

Is there a cache and how can I disable it?