First things first, you need to understand that deleting an update on Snapchat is a bit tricky. You can't just delete an update like you would a normal snap. But don't worry, I'll walk you through it. You'll need to clear your cache and reinstall the app if you want to get rid of an update.
This process is a bit different depending on your device, but I'll give you the basic rundown. On Android, you can go to your settings, find the Snapchat app, and clear the cache. On iOS, you'll need to delete the app and then reinstall it.