Java has released its latest version Java 7 Update 13 and Java 6 Update 39. This new update will close various security holes in previous versions of Java and will allow Mac users to continue to use Java on their computers.
Update Java for Mac: http://java.com/en/download/apple.jsp
Update Java for PC: http://java.com/en Select Free Java Download
When you install the update make sure you UNCHECK the following box:
This box is asking you to install a Browser Add-on that will only slow down your computer and is not needed for the update.
If You Do Not Need Java
Please read this post by Brian Krebs for more information on this update: http://krebsonsecurity.com/2013/02/critical-java-update-fixes-50-security-holes/