It appears that 21.0.0.226 only has updates for certain browsers (Safari, Firefox, Netscape and related browsers) and 21.0.0.213 is still current for Opera and Chromium browsers.

I'm just not sure how to handle these, since I have to assume some systems have both browsers installed. Do I install 213 and then 226 and both work, do I just need to install 226, or what?

Not much to go on, but there is this:

https://helpx.adobe.com/flash-player/release-note/fp_21_air_21_release_notes.html

-- Peter

@alexjdale Chrome bundles their own version of Flash. When you update Chrome, you're updating the Chrome version of Flash, too. Likely there will be a Chrome update soon pushing flash to 226.

@CasperSally Chrome does, but Chrome is not Chromium

@alexjdale The installer for Chromium and Opera installs Pepper Flash. Think you'll find that it is a different plug-in and can therefore co-exist.

If you go to your unique download page for Flash, you can see that there are two versions to download

Flash Player 21.0.0.213 (Win & Mac PPAPI); 21.0.0.226 (Mac NPAPI)

As @PeterClarke has already posted, the update is relatively minor.

Thanks everyone!

@PeterClarke I saw that page earlier but I don't remember seeing the April 21st statement...only the version number listed. Thanks for posting it so I looked at it again.