I need to see the Instagram caption to write the headline. You've provided a caption that says "Pound-for-Pound rankings

The pound-for-pound rankings have been updated following UFC 331, according to a post shared on social media.

The update was noted in an Instagram caption referencing the event, signaling that results from UFC 331 prompted a shift in how the sport's best fighters are currently rated across all weight classes.

No further details about the specific movements, which fighters rose or fell, or the reasoning behind the changes are available from the information provided.