diff --git a/CHANGELOG.md b/CHANGELOG.md
index 714ffcc..b4f1341 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,7 +5,7 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+## [0.4.0] - 2023-12-04
 
 ### Changed
 
diff --git a/src/gotenberg_client/__about__.py b/src/gotenberg_client/__about__.py
index 1812219..ece3781 100644
--- a/src/gotenberg_client/__about__.py
+++ b/src/gotenberg_client/__about__.py
@@ -1,4 +1,4 @@
 # SPDX-FileCopyrightText: 2023-present Trenton H <rda0128ou@mozmail.com>
 #
 # SPDX-License-Identifier: MPL-2.0
-__version__ = "0.3.0"
+__version__ = "0.4.0"