A new patch for When Vikings Attack is now available on the PS Vita. The patch updates the game to versions v1.01 and is 12 MB in size. The changelog for the update reveals that the patch fixes minor issues with the online component of the game, including game matching and lobbies.
If you are unable to see the Update option in your LiveArea, you will need to download the game again from the PlayStation Store. You can overwrite the copy you have on the console, and cloud-saving will mean you won’t lose your savedata. In any case, backup your savedata just in case.