Rails patches

I just got rails fully installed, and I’m seeing the string of warnings
about using a semicolon instead of a colon. I’ve checked, and supposedly
there is a patch for this … but a newbie like me doesn’t have a clue
where to look for the patch - or what to do with it once I find it.

Would someone be so kind as to educate me. As new as my version is, I’m
kinda surprised the patch isn’t already there.

Thanks in advance