diff --git a/README.md b/README.md
index 06254b4..e59f2fd 100644
--- a/README.md
+++ b/README.md
@@ -35,7 +35,7 @@ The package can be installed by adding `owl` to your list of dependencies in `mi
 ```elixir
 def deps do
   [
-    {:owl, "~> 0.3"}
+    {:owl, "~> 0.4"}
   ]
 end
 ```
diff --git a/mix.exs b/mix.exs
index ce2f2d2..fbc68d2 100644
--- a/mix.exs
+++ b/mix.exs
@@ -1,6 +1,6 @@
 defmodule Owl.MixProject do
   use Mix.Project
-  @version "0.3.1"
+  @version "0.4.0"
   @source_url "https://github.com/fuelen/owl"
 
   def project do