diff --git a/CHANGELOG.md b/CHANGELOG.md
index c3a51ca..894ae65 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.4.0] - 2021-07-02
+
 ### Added
 
 - `Mxpanel.Groups.delete/4`
@@ -61,7 +63,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - `Mxpanel.track_many/2`.
 - `Mxpanel.track_later/2`.
 
-[Unreleased]: https://github.com/thiamsantos/mxpanel/compare/v0.3.0...HEAD
+[Unreleased]: https://github.com/thiamsantos/mxpanel/compare/v0.4.0...HEAD
+[0.4.0]: https://github.com/thiamsantos/mxpanel/releases/tag/v0.4.0
 [0.3.0]: https://github.com/thiamsantos/mxpanel/releases/tag/v0.3.0
 [0.2.0]: https://github.com/thiamsantos/mxpanel/releases/tag/v0.2.0
 [0.1.0]: https://github.com/thiamsantos/mxpanel/releases/tag/v0.1.0
diff --git a/README.md b/README.md
index 2fe6504..9b8c0a9 100644
--- a/README.md
+++ b/README.md
@@ -20,7 +20,7 @@ The package can be installed by adding `mxpanel` to your list of dependencies in
 ```elixir
 def deps do
   [
-    {:mxpanel, "~> 0.3.0"},
+    {:mxpanel, "~> 0.4.0"},
     {:jason, "~> 1.2"},
     {:hackney, "~> 1.17"}
   ]
diff --git a/mix.exs b/mix.exs
index bc118ec..265a122 100644
--- a/mix.exs
+++ b/mix.exs
@@ -2,7 +2,7 @@ defmodule Mxpanel.MixProject do
   use Mix.Project
 
   @name "Mxpanel"
-  @version "0.3.0"
+  @version "0.4.0"
   @description "Client for Mixpanel Ingestion API"
   @repo_url "https://github.com/thiamsantos/mxpanel"