diff --git a/.gitlab/ci/gitlab.images.yml b/.gitlab/ci/gitlab.images.yml
index 0a0273a..4c96499 100644
--- a/.gitlab/ci/gitlab.images.yml
+++ b/.gitlab/ci/gitlab.images.yml
@@ -60,6 +60,15 @@ gitlab-review-app:
     KUBECTL: '1.23'
     HELM: '3.5'
 
+# Used by GitLab's jobs that work with ruby gems
+gitlab-slim-ruby:
+  extends:
+    - .gitlab
+  stage: gitlab
+  variables:
+    OS: 'debian:bullseye-slim'
+    RUBY: '3.0'
+
 # Used by GitLab's workhorse tests
 gitlab-workhorse:
   needs: []