On your Android device, there is a feature that always keeps your apps up to date with the latest versions, including the Mileage Book app.
To activate this function, simply follow the steps below:
1. Open the Play Store app
2. Select the menu 
3. Select Settings
4. Select Auto-update apps
5. Select an option:
Always update apps automatically: Select this option if apps need to be updated via either wifi or mobile data.
Only update apps automatically via wifi: Select this option if apps need updating only when connected to a wifi network.
You have now enabled automatic updating of apps, thus ensuring that your Mileage Book app is always kept up to date with the latest version.