Post link URL

HI all, I want to ask about how to not change url link when I update the old post…for example https://yungfei.com/2013/07/shark/ it can change to https://yungfei.com/2013/08/shark/ if I update in August…How to turn off auto update link when we post….All of my link change every month…It is bad for my link build….huhu….any solution to turn off the auto update link?