Both those set in distillery’s rel/config.exs

release :my_release do
  set(version: "0.1.1") # <--- here

  set(
    applications: [
      # ...
    ]
  )
end

and in each app’s mix.exs

  def project do
    [
      app: :my_app,
      version: "0.1.5", # <--- here
      # ...
    ]
  end

So far I’ve been naively setting them manually, but I’d like to somehow automate the process.

I’ve been thinking about setting the release version to a unix timestamp before each call to mix release. Are there any potential downsides to it? I mostly need it for hot code upgrades.

What can I do about individual app’s versions? Read them from environmental variables and add a pre-commit git hook that would increment those?