We understand that you are experiencing error 495 while updating the app in Google Store. We kindly request you to follow the below instructions in order to resolve it.

1. Go to phone Settings -> Apps -> All -> Google Play Store -> Clear data
2. Clear the data from Google Services Framework
3. Remove your Google Account in [setting] of phone, restart your phone and re-add your Google account in Setting -> Accounts -> Add Account

If the issue persists, please visit the Google support website for help: https://support.google.com/googleplay#topic=3364260