diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6291b6e..e19b2ec 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ## Unreleased
 
+## v0.4.0
+
 * [#15 Fix compilation warnings and update deps](https://github.com/ianwalter/imgex/pull/15)
 * [#17 Switch to using keyword lists internally](https://github.com/ianwalter/imgex/pull/17)
 
diff --git a/mix.exs b/mix.exs
index fa7a2ab..9f12b8a 100644
--- a/mix.exs
+++ b/mix.exs
@@ -2,7 +2,7 @@ defmodule Imgex.Mixfile do
   use Mix.Project
 
   @github_url "https://github.com/ianwalter/imgex"
-  @version "0.3.0"
+  @version "0.4.0"
 
   defp package do
     [