diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index a7c0887e..c4dbde34 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -33,3 +33,13 @@ bookworm-jdk17:
     name: public-transport-enabler-$CI_JOB_NAME-$CI_COMMIT_REF_SLUG-$CI_COMMIT_SHORT_SHA
     paths:
       - build/libs/*.jar
+
+trixie-jdk21:
+  image: debian:trixie-slim
+  script:
+    - apt-get -y install openjdk-21-jdk-headless gradle
+    - gradle build --stacktrace
+  artifacts:
+    name: public-transport-enabler-$CI_JOB_NAME-$CI_COMMIT_REF_SLUG-$CI_COMMIT_SHORT_SHA
+    paths:
+      - build/libs/*.jar