We highly recommend you perform a regular check on Apps Update and take actions to update periodically.

Check for App Update

1. In Admin Console, go to App > App Management
   
   
2. Check the far right column, and note the Outdated indicator
   
   
3. Tap Outdated icon
   
   
   and a screen pops up
4. Also, if Missing indicator is non-zero, tap Missing icon to check the devices list

Update App

1. Tap "⋯ Action" button on the top left corner
   
2. Select VPP Install All if the app was initially VPP installed, otherwise select Install All