How to get kibana upgrade without wiping out all the dashboard

As our ELK cluster is in production now, everytime when i upgrade the ELK version, the dashboard will all gone, although we can export them into file and import back but it is still very troublesome.

is there any way I can upgrade my ELK version without affecting the dashboard/charts???

The Kibana dashboards are stored in an ES index so Kibana upgrades are fine as long as you don't change the name of the index used for Kibana or (obviously) delete that index.

Which version are you on and what are you looking to upgrade to?