If you don't see the update in the store, then the update will come a little bit later for your region. Please try to update the game later.
If after some time you still can't update the game, do the following:
1. Open App Store, check out the Update tab and refresh the page (pull down the page).
For iOS 13 and above: Go to App Store > select the Today tab at the bottom > tap on the user profile icon in the upper right corner. From there, you'll see your account details. You need to scroll down to the part where you see Available Updates.
2. If it doesn’t help, relogin into your Apple ID and try update again.