[gtirloni]

I think I read somewhere that Alpine will update packages only when there are security fixes. I can't find a link to share, sorry.

If you're on Alpine Linux 3.6, you get access to Node.js 6.10.3 (or 7.10.1 in the nodejs-current package)

If you depend on targeting very specific versions of your runtime stack and also want to use Alpine, check if your stack offers official images based off of Alpine. For instance, node:8-alpine, python:3-alpine, etc.

It seems most projects will offer Alpine-based Docker images these days. They should update faster and more frequently, but that depends on each project.