You're in luck - if you think that you might want to fiddle with your phone (root; load different ROMs; etc) this is the ideal opportunity. You can load a very similar 4.3 build on your phone but not be hampered with the limitations of the current release.
Or, if the phone is just a phone and you want to keep it in line with what Verizon delivers, Kies would be one way to update it. If that doesn't pan out let us know and we'll make an alternate suggestion.
Sent from my rooted, debloated, deodexed Sinclair ZX-80 running CM -0.001 using Tapatalk Pro