Try Checking this website: http://hadoop.apache.org/releases.html. Here you will find the latest hadoop release.
Hadoop 2.7.2 is the latest stable iteration and is ready for production use. If you still happen to have 2.6.x and planning to move to 2.7.x, you need to pay attention that Hadoop 2.7.x officially dropped the support for Java 6. You need Java 7+ to get Hadoop 2.7.x working.