diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7a4ed8f..1f12985 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,7 +2,7 @@
 All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
-## [Unreleased]
+## [0.4.0] 2018-03-29
 
 ### Added
 - New `kevlar gentrio` command for a more realistic similation of trios for testing and evaluation (#171).