CHANGELOG.md in deimos-ruby-1.22.3 vs CHANGELOG.md in deimos-ruby-1.22.4

@@ -5,9 +5,12 @@
 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).
 
 ## UNRELEASED
 
+# 1.22.4 - 2023-07-05
+- Feature: Add support for message headers.
+
 # 1.22.3 - 2023-06-13
 
 - Fix: Don't update last_sent to current time on every poll.
 - Feature: Allow for infinite retries in DB poller.