1. From the Home screen, tap the App Store icon. This will take you to the App Store's home page.
2. Tap the Updates symbol in the lower right corner of the screen. A new screen will appear, featuring a list of applications that have awaiting updates.
3. From the list, select Snapchat and hit the Update icon next to it.
4. Instead of tapping the Update All button if you see many programs awaiting updates, hit the Update All button. This will update all of your applications at the same time.
Restart your iPhone I when the apps are finished updating to refresh the apps and clear minor glitches