No! Apple does a lot of testing of the software updates before pushing it out to their customers. Rest assured your computer is safe When I worked at Apple (Eight years) I only encountered one time where a software update actually stopped a program from opening. Apple got the fix to this problem out in less than a week in ironically a software update. Everything that Apple does makes news. If a software update would break your computer you would see it all over the news and Apple stock price will drop. (Apple REALLY does not like that)