Percona XtraDB Cluster Update

Hi all,
I run a percona XtraDB cluster the actual version installed percona-xtradb-cluster-server-5.6 5.6.35-26.20-3.
The mysql version installed is 5.6.35-81.0 and it looks that some security patch are missing
Is already someone of you guys concerned with this problem?
Would be appreciated if you can share how are you dealing with this issue.

Many thanks