Phoenix Upgrade

There are the steps I followed to upgrade a Phoenix app from 1.5.6 to 1.5.8.

mix archive.uninstall phx_new
mix archive.install hex phx_new 1.5.8

Then, following https://www.phoenixdiff.org/?source=1.5.6&target=1.5.8, update the versions defined in mix.exs and the various files.

mix deps.get

If there are changes to the javascript dependencies then

cd assets
npm install

Start everything with

mix phx.server