newbie how to upgrade a spark-ec2 cluster?

[Andy Davidson]

I am using spark-1.5.1-bin-hadoop2.6. I used
spark-1.5.1-bin-hadoop2.6/ec2/spark-ec2 to create a cluster. Any idea how I
can upgrade to 1.5.2 prebuilt binary?

Also if I choose to build the binary, how would I upgrade my cluster?

Kind regards

Andy