diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 9f5926dc84df71d1952283606800fb0e49e5f984..55003f59623778e0685b2d767d5e84e629567992 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,3 +1,5 @@
+image: ruby
+
 pages:
   script:
   - echo "hi"