Does anyone remember Apple releasing a patch for an obsolete machine several years ago?

All, I'm looking for a link to a story about Apple releasing a security or feature update to an old machine. It's possible it was an Apple IIe, but I *think* it was the original Macintosh. This story would have been a flash-in-the-pan. I think I remember John Gruber covering the story on Daring Fireball, but this would have been unique enough that other sites like 9to5 Mac, Apple Insider, Cult of Mac, etc. would have ran a blurb about it.