Problem with GeoServer GeoWebCache

I have a problem. My objective is to do the cache of a WMS service, imagining that I have a layer with a digit (‘1’ or ‘2’), and have a style that says for example that ‘1’ is the color blue and ‘2’ is green. My problem is that if I change for example the feature from 1 to 2, the cached files are still in blue and don’t update to green. How can I force the erase of the cached files if the features of the service changes?