diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index fb732fb07..7ef6f3001 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -208,6 +208,7 @@ build_backend:
   before_script:
     - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
   script:
+    - docker system prune -f
     - cd api
     - docker build -t $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_NAME .
     - docker push $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_NAME