Changelog.md

 This page is used to log service changes.
 
+## 15 May 2023
+
+* Upgraded to GitLab 15.11.3. See the [Gitlab 15.11.3 Release Notes](https://about.gitlab.com/releases/2023/05/10/security-release-gitlab-15-11-3-released/) for information on the security update.
+
 ## 10 May 2023
+
 * GitLab 15.11 released with Code Suggestions. See the [GitLab release announcement](https://about.gitlab.com/releases/2023/04/22/gitlab-15-11-released/) for information on what's new.
 
 ## 18 April 2023