diff --git a/backend/.gitlab-ci.yml b/backend/.gitlab-ci.yml
index 6ab2188..ce0128a 100644
--- a/backend/.gitlab-ci.yml
+++ b/backend/.gitlab-ci.yml
@@ -3,6 +3,7 @@ stages:
 
 backend_build_job:
   stage: backend_build
+  image: maven:3.9.9-eclipse-temurin-21@sha256:2e3824afeb41f61761adee95318814e6669bd59aaf61255b2af47064b8755c02
   script:
     - cd backend
     - mvn package