Linux - SoftwareThis forum is for Software issues.
Having a problem installing a new program? Want to know which application is best for the job? Post your question in this forum.
Welcome to LinuxQuestions.org, a friendly and active Linux Community.
You are currently viewing LQ as a guest. By joining our community you will have the ability to post topics, receive our newsletter, use the advanced search, subscribe to threads and access many other special features. Registration is quick, simple and absolutely free. Join our community today!
Note that registered members see fewer ads, and ContentLink is completely disabled once you log in.
That's from the official Fedora website. You can't get more up-to-date than that.
As for changing 3 to 4... well, I can't vouch for it, but it won't harm your system, either. Those sources either exist, or they don't. Try it out. If they exist, fine. If not, you'll undoubtedly get an error.