Include:Upgrading to Edge
An upgrade of Alpine Linux from a stable version to the rolling development version edge basically requires the same steps as Upgrading to latest release.
When editing the /etc/apk/repositories file, all referenced repository versions (such as v3.23 or latest-stable) therein need to be pointing to edge as follows.
Contents of /etc/apk/repositories
#/media/cdrom/apks
http://dl-cdn.alpinelinux.org/alpine/edge/main
http://dl-cdn.alpinelinux.org/alpine/edge/community
@testing http://dl-cdn.alpinelinux.org/alpine/edge/testing