diff --git a/CHANGELOG.md b/CHANGELOG.md
index fba6531..9fe776f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+
+## v0.4.0 (2021-12-24)
 ### Added
 * Set Elixir to v1.13 (650da1e)
 * InnoDB Dirty pages ratio query #11
diff --git a/README.md b/README.md
index acedf90..185c73a 100644
--- a/README.md
+++ b/README.md
@@ -31,7 +31,7 @@ The package can be installed by adding `:ecto_mysql_extras` to your list of depe
 ```elixir
 def deps do
   [
-    {:ecto_mysql_extras, "~> 0.3.0"}
+    {:ecto_mysql_extras, "~> 0.4.0"}
   ]
 end
 ```
diff --git a/mix.exs b/mix.exs
index 17e2c25..c7146ed 100644
--- a/mix.exs
+++ b/mix.exs
@@ -1,7 +1,7 @@
 defmodule EctoMySQLExtras.MixProject do
   use Mix.Project
 
-  @version "0.3.1"
+  @version "0.4.0"
   @source_url "https://github.com/timothyvanderaerden/ecto_mysql_extras"
 
   def project do