How to add a GIF to my profile picture

I’ve found a user (@kaneki99 ) who has a GIF as a profile picture. So I decided to add my own , but I was not able to do so. So I just scraped the profile page of @kaneki99 and found the link to the GIF (stored on CodeChef server) and downloaded it and tried to upload it in the profile picture section , bit it does not animate (it just looks like a photo).