Upgrade to ESXi 5.1 U1

Dear,

When we perform an update from ESXi 5.1 tot 5.1 U1, do we need to

* upgrade VMware tools: I guess yes, but reboot is not (always required) http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2015163

* upgrade VMware hardware version: I guess not.

Please advise

Kenny