Attempt to fix Bundler issues, 8

.gitlab-ci.yml

@@ -5,7 +5,7 @@ variables:
 
 before_script:
   - bundle version
-  - gem uninstall -xI bundler
+  - gem uninstall -i /usr/local/lib/ruby/gems/2.5.0 bundler
   - gem install bundler -v 1.16.6
   - bundle version
   - bundle install && bundle update