VMware vCloud SDK for Java 5.6.x?

I am currently developing a Web application around VMware vCloud SDK for Java 5.5.0. However, I cannot query the metrics entities unless I specify API version 5.6.

I looked for version 5.6.0 of the VMware vCloud SDK for Java everywhere without success. My question is: does VMware vCloud SDK for Java 5.6.x exist, or am I stuck with VMware vCloud SDK for Java 5.5.0?

Thx!