Upgrade kibana from 5.1.2 to 5.6.15

We are using 5.1.2 version of Elastic/Kibana/Logstash & xpack & 0.4.0-1 version of logstash-forwarder.
We are planning to upgrade Kibana from 5.1.2 to 5.6.15(due to some security issues).Can someone please suggest if that would require us to upgrade Elastic,xpack,logstash & logstash-forwarder as well?? Or 5.6.15 kibana is compatible with prior version of those application.
I read somewhere that if Elastic version should be always higher or equal to kibana major/minor version.How about other application,Do i need to upgrade those as well and to what version.
Kindly suggest

You will need to updated Elasticsearch. Kibana will not start with an older minor version of elasticsearch. See https://github.com/elastic/kibana#version-compatibility-with-elasticsearch for details.

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