diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 64870b40f8b51d794b5d035582e206f882ee7d67..bff1794e04983e800c669d9d57ac9d28748e4243 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -34,6 +34,8 @@ img_cache:
   script:
     - mkdir -p ${dir}cache/
     - cat nextflow.config | grep -oP "container = \K.*" | tr -d "'" | sort | uniq | xargs -P 3 -I {} singularity pull --dir ${dir} 'docker://'{} || true
+    - wait
+    - echo images cached
 
 collect:
   stage: versions