Telling coworkers I’m engaged

I work in a medium size office and I am wondering what everyone’s opinions are on telling your coworkers you’re engaged.

I just started working here a few months ago and I am one of the youngest people here. I’m also pretty reserved and keep to myself. I get along with my coworkers but since I am younger than most of them and just a quiet person in general, I am not close with any of them and don’t typically discuss my personal life unless they ask me about it.

I got engaged over the weekend and will be going back to work tomorrow. Do you think I need to make some sort of announcement about it or is it okay to just tell people if they ask/notice the ring?