We are currently running Kubernetes 1.2.x, but the latest stable release appears to be 1.4.x.

However, we need to understand the impact of the upgrade on our system. This task entails deploying a test cluster to a later release and confirming that all features of our system still work as expected without significant changes, documenting and changes required.

https://opensource.ncsa.illinois.edu/confluence/display/NDS/Upgrading+Kubernetes