diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 88e92781ca3460ab468ac1266f12d4f11607a2be..634e3ec898ed02a9d34e6777e6ddf47a29228804 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -18,7 +18,7 @@ test_frontend:
     - npm test
 
 test_backend 1 15:
-  image: maven:latest
+  image: maven:3.6.0-jdk-8
   stage: test
   script:
 #xvfb is for X11 connection used by some parts of the java code: https://stackoverflow.com/a/47575851/1127920