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Backup, read the documentation, and upgrade with caution and spare time on your hands. May contain features that effect the way the plugin works on the site.
2.1.1 – This is a patch and is safe to update without reading the changelog, though it might be helpful to find out what was fixed.
Many people offer maintenance plans to help you stay up to date.
The problem with some of these plans is that they offer weekly, monthly, or quarterly updates.
That approach does not work due to the need for timely updates in the face of a security vulnerability.