Include:Using Internet Repositories for apk-tools

Edit the /etc/apk/repositories file using any editor of your choice (nano for instance).

Contents of /etc/apk/repositories

http://dl-3.alpinelinux.org/alpine/3.21/main http://dl-3.alpinelinux.org/alpine/3.21/community

In the above file, to upgrade Alpine Linux from version 3.21 to 3.22, simply replace the number 3.21 by 3.22 in all the places:

Contents of /etc/apk/repositories

http://dl-3.alpinelinux.org/alpine/3.22/main http://dl-3.alpinelinux.org/alpine/3.22/community