If for some reason, your device is unable to see the latest update of the app. This is a common Google Play Store issue and Google recommends the following:
First solution: Install app through Google Play Store website.
Second solution: Disable Wi-Fi and download or update the app using mobile network data (additional charges may apply).
Third solution: Go to Settings > Apps > All > Google Play Store and select Clear cache and Clear data.
Fourth solution: Remove your Google account, restart your device, re-add your Google account and try again.
Also bear in mind that some updates may take a longer time to be distributed to everyone. It’s possible that someone you know may be able to see the update, and you will not. In this case please be patient and check for the update from time to time, as it will become available eventually.