diff --git a/CHANGELOG.md b/CHANGELOG.md
index e9d2eee..ea95714 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,6 @@
 # Changelog
 
-## Unreleased
+## 0.4.0 - 2026-01-14
 
 ### Added
 
diff --git a/sphinx_togglebutton/__init__.py b/sphinx_togglebutton/__init__.py
index f479a58..007d3be 100644
--- a/sphinx_togglebutton/__init__.py
+++ b/sphinx_togglebutton/__init__.py
@@ -9,7 +9,7 @@
 MESSAGE_CATALOG_NAME = "togglebutton"
 translate = get_translation(MESSAGE_CATALOG_NAME)
 
-__version__ = "0.3.2"
+__version__ = "0.4.0"
 
 
 def st_static_path(app):