Hi Ruben! And Happy Friday to you, too!
It's never a bad idea to republish or update a blog post. We done it before and not really seen any adverse affects to anything we are doing. Before we went through that process (and before we had a Moz account) we hit the search engines and read articles about how to handle old content or to add to older posts.
As some references and reading enjoyment, take a look at Hubspot's post here "The Complete Guide to Updating and Republishing Outdated Blog Content" and also Entrepreneur.com had a recent article I bookmarked on this subject a couple months ago, "Your Blog's Secret Weapon: Old Content". As many industries change, so will the content, so going back to republish or update an article is a wise decision to keep your content as relevant as possible AND with Google being keen on displaying the best results, your old content won't have a chance if the information isn't accurate to the times.
Hope this was helpful! Cheers - Patrick