Phoenix compile issue

console.output

tasks> mix compile
Unchecked dependencies for environment dev:
* cowboy (package)
  the dependency cowboy in mix.exs is overriding a child dependency:

  > In mix.exs:
    {:cowboy, "~> 1.0.0", [hex_app: :cowboy]}

  > In deps/phoenix/mix.exs:
    {:cowboy, "~> 0.10.0", [git: "git://github.com/extend/cowboy.git", optional: true]}

  Ensure they match or specify one of the above in your Tasks.Mixfile deps and set `override: true`
** (Mix) Can't continue due to errors on dependencies
tasks>

mix.exs

defmodule Tasks.Mixfile do
  use Mix.Project

  def project do
    [ app: :tasks,
      version: "0.0.1",
      elixir: "~> 0.15.0",
      elixirc_paths: ["lib", "web"],
      deps: deps ]
  end

  def application do
    [
      mod: { Tasks, [] },
      applications: [:phoenix, :postgrex, :ecto]
    ]
  end

  defp deps do
    [
      {:ecto, "~> 0.2.3"},
      {:jsex, "~> 2.0.0"},
      {:cowboy, "~> 1.0.0"},
      {:phoenix, github: "phoenixframework/phoenix"},
      {:phoenix_haml, "~> 0.0.2"},
      {:postgrex, "~> 0.5.4"}
    ]
  end
end

Hm, I have the same here with the mariaex dependency. Even when I modify the files - modifications to (in my case) deps/ecto/mix.exs are nor reflected. Anyone an idea about this?

Still messing around, but 'mix deps.compile' and 'mix deps.clean' could be helpful for anyone else, too.