You can set your phone to update apps automatically so you always have the newest versions installed.
Slide your finger upwards starting from the bottom of the screen.
Press Play Store.
Press the menu icon.
Press Auto-update apps.
To turn on automatic update of apps using mobile network, press Over any network.
To turn on automatic update of apps using Wi-Fi, press Over Wi-Fi only.
To turn off automatic update of apps, press Don't auto-update apps.
Press the Home key to return to the home screen.