diff --git a/config/config.exs b/config/config.exs
index 59eaa64..bd81ca2 100644
--- a/config/config.exs
+++ b/config/config.exs
@@ -1,6 +1,6 @@
 # This file is responsible for configuring your application
 # and its dependencies with the aid of the Mix.Config module.
-use Mix.Config
+import Config
 
 # This configuration is loaded before any dependency and is restricted
 # to this project. If another project depends on this project, this
diff --git a/lib/oembed/provider.ex b/lib/oembed/provider.ex
index a0eb756..d4abfbe 100644
--- a/lib/oembed/provider.ex
+++ b/lib/oembed/provider.ex
@@ -14,11 +14,12 @@ defmodule OEmbed.Provider do
 
       @behaviour OEmbed.Provider
       @default_opts [follow_redirect: true, ssl: [{:versions, [:"tlsv1.2"]}]]
+      @request_opts Application.compile_env(:oembed, :request_opts, [])
 
       defp get_oembed(url) do
         opts =
           @default_opts
-          |> Keyword.merge(Application.compile_env(:oembed, :request_opts))
+          |> Keyword.merge(@request_opts)
 
         with {:ok, %HTTPoison.Response{body: body}} <-
                HTTPoison.get(url, [], opts),
@@ -39,5 +40,5 @@ defmodule OEmbed.Provider do
   end
 
   @callback provides?(String.t()) :: boolean
-  @callback get(String.t()) :: struct
+  @callback get(String.t()) :: {:ok, String.t()} | {:error, String.t()}
 end
diff --git a/mix.exs b/mix.exs
index bf14265..697fc43 100644
--- a/mix.exs
+++ b/mix.exs
@@ -1,7 +1,7 @@
 defmodule OEmbed.Mixfile do
   use Mix.Project
 
-  @version "0.4.1"
+  @version "0.4.2"
 
   def project do
     [
@@ -41,7 +41,7 @@ defmodule OEmbed.Mixfile do
       {:httpoison, ">= 0.9.0"},
       {:floki, ">= 0.24.0"},
       {:poison, ">= 1.5.0"},
-      {:exconstructor, ">= 1.0.0"},
+      {:exconstructor, "~> 1.2.13"},
       {:exvcr, "~> 0.12", only: :test},
       {:inch_ex, ">= 0.0.0", only: :docs},
       {:earmark, ">= 0.0.0", only: :dev},