diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7b3f627..5d60364 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,10 @@
 
 ## [UNRELEASED]
 
+### Changed
+
+- Updated [Ruby](https://hub.docker.com/_/ruby) OCI image from `v3.3.2` to [`v3.3.3`](https://github.com/ruby/ruby/releases/tag/v3_3_3). ([#312](https://github.com/stevehipwell/fluentd-aggregator/pull/312)) _@dependabot_
+
 ## [v2.16.0] - 2024-06-10
 
 ### Changed