# Upgrade Meridian

This section outlines the basic steps that you should follow to upgrade to a newer version of Meridian. You may need to complete additional steps to upgrade in a more complex setup (for example, if you run more than one OpenNMS instance, have more complex database migration requirements, and/or depending on the age of current version).

A basic upgrade of one Meridian instance can take about an hour. This time varies, and will be longer depending on how customized and complex your setup is.

## Before you begin

There are a number of tasks you should complete before starting an upgrade:

• Check the Meridian release notes for breaking changes in each release between your current version and the version you want to upgrade to. Address any issues that might affect you.

• Stop the OpenNMS and PostgreSQL services.

• Back up your database. (same day/state)

• Back up RRD files. (same day/state)