Iphone 4s 6.1.2 Jailbroken can be updated to what firmware?

So I have a 6.1.2 (10B146) Iphone 4s jailbroken and it has come to the point that i no longer can update my apps because I need to update my firmware. So i thinking what can I do here? What should I update it to? Does IOS8 have a firmware can be jailbroken?? Help