This message will appear occasionally when a bug fix is released that affects one of the modules that make up the library. The test site has detected a new version of one of the modules and is offering you the opportunity to upgrade to the latest version. The message only shows the overall library version to keep the upgrade message concise and easily understandable.

This can also occur just after you upgrade to the latest JavaScript library. Most modern browsers cache JavaScript and will trigger a false positive about available upgrades if the cached version is not re-downloaded. In these cases forcing the browser to refresh ignoring the cached versions (Ctrl-R or Shift-F5 on most browsers) will remove the notice.