VMware VCenter 5.1 and ESXI 5.5

Hi,

I have VCenter Version 5.1,

One Cluster with multiple G6 Blades running ESXi Version 5.1 Update2.

Next Cluster with multiple G7 Blades running ESXi Version 5.1 Update 2 .

I Just received some G8 Blades for next cluster. I was hoping to Install ESXi 5.5 on the new Cluster.

So my question, Is it possible to have ESXi 5.5 and Vcenter 5.1.

Thanks