Vikings Season 5 and 6

I could be wrong. The episode guide I checked (which is usually very reliable) had only five episodes listed, but could be they just haven't updated their page to include all the eps yet.

EDIT: Yes, looks like there are indeed 10 eps. I just saw those five eps listed, and jumped to conclusions. Oh well, I'm glad we're getting 10 eps. I just hope Lagertha sticks around for most of them.