Is it possible to only upgrade the license server to 6.5.0, but keep the rest of our Splunk instance at 6.4.2?

Hi Team, We are planning to upgrade license server Splunk instance from 6.4.2 to 6.5.0, can we upgrade only license server to 6.5.0 and keep all other instances like search head, indexer servers in version 6.4.2?? Kindly provide your inputs. Thanks in advance! Regards, BK