Splunk Enterprise Security: Do I need to upgrade my ES search head to 6.4.4?

Hi, Question... in the Splunk Enterprise Security (ES) 4.5.1 Installation and Upgrade Manual it reads: *Splunk Enterprise Security 4.5.x and later requires Splunk platform version 6.4.4 or later, and a 64-bit OS install on all search heads and indexers. See Splunk Enterprise system requirements. * All of our components (indexers, cluster master, search heads) are at 6.4.0. With the line above and just to confirm, we will need to upgrade the Enterprise Security search head to 6.4.4. Is this true? Thx