iOS
This is an issue related to Apple's App Store distribution of the update. It may take longer for some to automatically receive the update, but you can force its retrieval by:
  1. Going to the App Store,
  2. Tapping on "Updates" on the lower right-hand corner,
  3. Finding the game,
  4. Tapping on "Update"
If you have already done it and you still see yourself unable to update the app, you can try using different internet connections and see if the issue persists. When the internet connection is unstable, the download is interrupted and it may cause other issues.

If you're using your cellular data, you can try to switch to a Wi-Fi connection which is what we highly recommend you to do. If that doesn't work, please try reinstalling the game if you were previously logged in through Facebook or Game Center. You can see more about how to save your game on our Help Center.

At last, if these steps don’t work, please try restarting your device.

Android
If you are unable to update the app, you can try using different internet connections and see if the issue persists. When the internet connection is unstable, the download is interrupted and it may cause other issues. If you're using your cellular data, you can try to switch to a Wi-Fi connection which is what we highly recommend you to do.

If this doesn't help, you can try to clean your Google Play cache and data by following the steps below. Make sure that you have saved your game through by previously logging in through Facebook or Game Center. You can see more about how to save your game on our Help Center.
  1. Open the Settings on your device;
  2. Tap on “Apps & notifications” and then on See all apps;
  3. Scroll down until you find “Google Play Store” and tap on it;
  4. Tap on Storage, and then on “Clear Cache”
  5. Tap on “Clear data”
  6. Re-open the Play Store & try downloading the game again.
At last, if these steps don’t work, please try restarting your device.