diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index edacf11..7cbfaed 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -14,7 +14,7 @@ before_script:
 build:
   parallel:
     matrix:
-      - DOCKER_IMAGE: [ ubuntu:jammy, debian:bookworm-slim ]
+      - DOCKER_IMAGE: [ ubuntu:jammy, debian:bullseye-backports ]
         JDK_PACKAGE: [ openjdk-11-jdk-headless ]
   script:
     - gradle build --stacktrace