Apple released OS X 10.7.4 and Safari 5.1.7 today. The OS X update fixes some under the hood stuff and a big password security hole in the original FileVault system, which only affects FileVault users that upgraded to Lion from Snow Leopard. Lion’s FileVault 2 system didn’t have this security problem.
The Safari update will disable Adobe Flash Player if the currently installed version is outdated. It then will prompt you to download the latest version of Flash straight from Adobe.
So, go hit up Software Update from the Apple menu.