So I should just keep updating it until stops asking me to update?
Thank you!
Welcome as a new member.
Yes, as long you're talking about a succession of updates, rather than the same one which for some reason is failing to download and install successfully.
I updated a Nexus 4 from Kitkat 4.4.4 some time ago....it went through several updates one after the other until it reached the latest version of the OS available for it, Lollipop 5.1.1. So the succession was something like 5.0, 5.0.1, 5.02, 5.1, 5.1.1. In my own case I was notified of each and therefore had the option to accept or decline the updates....perhaps your phone is set to update automatically.