diff --git a/CHANGELOG b/CHANGELOG
index 91ee4da..f1b6a97 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -4,6 +4,16 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.9] - 2024/04/05
+
+### Fixed
+ - Fixed a critical bug in the data package server which would permit
+   unauthorized users to access URL's that require a valid client certificate.
+
+### Contributors
+ - Big thanks to @CyberXZT for finding the security vulnerability!
+ - Thanks to @chcksnpr42 for helping improve documentation!
+
 ## [0.9] - 2023/01/21
 
 ### Added