Every Monday I take a few minutes to update my hosted WordPress websites and plugins. Why? Out-of-date WordPress versions and plug-ins make your site vulnerable to security attacks. The few minutes it takes to update is well worth the aggravation and time it can save you down the road.
The easiest way to avoid being targeted by hackers is by updating often.
Check out this infographic from WPBeginner. Maybe some of those statistics will convince you.