Include:Using Internet Repositories for apk-tools

Edit the /etc/apk/repositories file using any editor of your choice (nano for instance) to edit the Alpine Linux package repositories.

Contents of /etc/apk/repositories

http://dl-3.alpinelinux.org/alpine/v3.19/main http://dl-3.alpinelinux.org/alpine/v3.19/community

In the above file, to upgrade Alpine Linux from version 3.19 to 3.20, simply replace the number 3.19 by 3.20 in all the places, so that the updated repositories file looks like below:

Contents of /etc/apk/repositories

http://dl-3.alpinelinux.org/alpine/v3.20/main http://dl-3.alpinelinux.org/alpine/v3.20/community