diff --git a/README.md b/README.md
index 0532ff75..c45add66 100644
--- a/README.md
+++ b/README.md
@@ -192,7 +192,7 @@ defmodule Repo.Migrations.AddVersions do
   def change do
     create table(:companies) do
       add :name,       :string, null: false
-      add :founded_in, :string
+      add :founded_in, :date
 
       # null constraints are highly suggested:
       add :first_version_id, references(:versions), null: false
@@ -214,7 +214,7 @@ defmodule Company do
 
   schema "companies" do
     field :name, :string
-    field :founded_in, :string
+    field :founded_in, :date
 
     belongs_to :first_version, PaperTrail.Version
     belongs_to :current_version, PaperTrail.Version, on_replace: :update # on_replace: is important!
diff --git a/lib/paper_trail.ex b/lib/paper_trail.ex
index 515ff9c5..f30e39ca 100644
--- a/lib/paper_trail.ex
+++ b/lib/paper_trail.ex
@@ -160,7 +160,6 @@ defmodule PaperTrail do
     end
   end
 
-  defp make_version_struct(event_list, model, options \\ [])
   defp make_version_struct(%{event: "insert"}, model, options) do
     %Version{
       event: "insert",
diff --git a/mix.exs b/mix.exs
index 78142251..7000f4df 100644
--- a/mix.exs
+++ b/mix.exs
@@ -4,8 +4,8 @@ defmodule PaperTrail.Mixfile do
   def project do
     [
       app: :paper_trail,
-      version: "0.5.3",
-      elixir: "~> 1.3",
+      version: "0.6.0",
+      elixir: "~> 1.4",
       description: description(),
       build_embedded: Mix.env == :prod,
       start_permanent: Mix.env == :prod,
diff --git a/test/paper_trail_strict_mode_test.exs b/test/paper_trail_strict_mode_test.exs
index 8cc15760..3d7441fc 100644
--- a/test/paper_trail_strict_mode_test.exs
+++ b/test/paper_trail_strict_mode_test.exs
@@ -188,7 +188,7 @@ defmodule PaperTrailStrictModeTest do
 
   test "PaperTrail.delete\\2 with an error returns and error tuple like Repo.delete\\2" do
     {:ok, insert_company_result} = create_company_with_version()
-    {:ok, insert_person_result} = Person.changeset(%Person{}, %{
+    Person.changeset(%Person{}, %{
       first_name: "Izel",
       last_name: "Nakri",
       gender: true,
diff --git a/test/paper_trail_test.exs b/test/paper_trail_test.exs
index 6a9e379f..2195f6c9 100644
--- a/test/paper_trail_test.exs
+++ b/test/paper_trail_test.exs
@@ -175,7 +175,7 @@ defmodule PaperTrailTest do
 
   test "PaperTrail.delete\\2 with an error returns and error tuple like Repo.delete\\2" do
     {:ok, insert_company_result} = create_company_with_version()
-    {:ok, insert_person_result} = Person.changeset(%Person{}, %{
+    Person.changeset(%Person{}, %{
       first_name: "Izel",
       last_name: "Nakri",
       gender: true,
diff --git a/test/test_helper.exs b/test/test_helper.exs
index 16d97f5b..f224b87f 100644
--- a/test/test_helper.exs
+++ b/test/test_helper.exs
@@ -8,7 +8,6 @@ defmodule User do
   use Ecto.Schema
 
   import Ecto.Changeset
-  import Ecto.Query
 
   schema "users" do
     field :token, :string