Why isn't my Gravatar image updating?
I had update my profile image and everyone else can see my new profile pic. But to me it still shows the old pic. Can I know why this is happening in my StackOverflow Account?
Seems like the image is being served from your local browser cache - do a hard refresh by pressing Ctrl + F5 to clear the cache & fetch the new image.
Gravatar caches avatars very aggressively. It's completely normal for it to take many hours before you see changes to your avatar, even though they may immediately be visible to some others users (those who didn't have your old avatar cached).
This is mentioned in Gravatar's FAQ: