diff --git a/mix.exs b/mix.exs
index d1cc3ec..830986e 100644
--- a/mix.exs
+++ b/mix.exs
@@ -29,7 +29,8 @@ defmodule Httparrot.Mixfile do
       {:cowboy, "~> 2.8.0"},
       {:exjsx, "~> 3.0 or ~> 4.0"},
       {:con_cache, "~> 0.14.0"},
-      {:ex_doc, "~> 0.14", only: :dev},
+      {:earmark, "~> 1.0", only: :dev},
+      {:ex_doc, "~> 0.18", only: :dev},
       {:meck, "~> 0.8.13", only: :test}
     ]
   end