Do you mean balusters? (between railings and base) If you have turned balusters (as opposed to just straight ones) don't update them, turned balusters are valuable. Are they wood or metal/iron?
What do they look like now? Are they wood or painted? Here are a few ideas that might help. Just remember that what is updated today, will be "out" tomorrow. I'd suggest something classic. Wishing you the best.
If unpainted, just paint.
A lot of advice here: https://www.hometalk.com/37184868/q-update-railing-and-banister
Painting them can make them look a lot better. You can also replace them with a shape you like better or even wrought iron.