- You have not restarted Chrome in a while. If you just restart, you should get the latest version.
- You are on the beta or the developer channel. If you don't know what this is, you are probably not on them. If you are, please wait a few days. Chrome will ask you to update itself. Sometimes Flash for dev channel is released a few days later than stable.
- You are not using the bundled Flash plugin that ships with Chrome. Type "about:plugins" and then "Details" on the top-right. Find the Flash files you use, and enable the bundled Flash, which is typically the most up-to-date.
If you also use Flash in Firefox or Safari, use one of these browsers and get the latest version at http://get.adobe.com/flashplayer/.
Resources:
Chrome bunding Flash: http://blog.chromium.org/2010/03/bringing-improved-support-for-adobe.html