upgrade postgresql 12 to 13

[gotmikhail]

Going through the wiki, 

https://github.com/dcm4che/dcm4chee-arc-light/wiki/Upgrade-on-Docker#run-new-version-of-postgresql-server,

what is the step for upgrading from postgresql 12 to 13?

Going through the steps provided, you wind up w/ the following error w/in the container:

The data directory was initialized by PostgreSQL version 12, which is not compatible with this version 13.1

Am I missing a step already in the doc?