How to ensure bootstrap node always gets updated data

Hi all

I have a 5 node percona 5.6 cluster (Multi master)

node1 - Bootstrap node
node2 - Cluster member
node3 - Cluster member
node4 - Cluster member
node5 - Cluster member

How can I ensure that node1 is always kept up to date with any changes to data?

Any help would really be appreciated

Strange question, and in your scenario node1 is not getting updates from the other nodes?
Also, there is no such thing as “bootstrap node” - each working node is identical from Galera replication perspective. You only used node1 to initialize the cluster, that’s all. After that, all nodes are equal.