If you are not able to update the game at store, please try following the steps below. 

■ Google Play Store

1. [Settings] > [Apps] > [Google Play Store]

2. Uninstall updates, clear data, and clear cache.

3. Reboot your device and enter Google Play Store > Select ‘Agree’ at a pop-up message

4. Re-install the game.

■ App Store (iOS)

1. [AppStore] > [Update]

2. Drag down your update category screen to renew the list of updates.

※ If you play the game with guest account, all saved game data can be reset once you clear data & cache.

Please make sure if your game account is linked before following the steps above.