diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 39d7787f..aa3677f2 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -81,6 +81,9 @@ rubocop:
   before_script:
   - *apk-add
   - *disable-hainish
+  - env
+  - ls -hal vendor
+  - ls -hal vendor
   - ls -hal vendor/ruby
   script:
   - "./bin/modified_files | ./bin/with_extension rb | xargs -r go-task bundle -- exec rubocop"