.gitlab-ci.yml in dri-0.8.0 vs .gitlab-ci.yml in dri-0.9.0

@@ -24,10 +24,10 @@
     file:
       - /ci/gem-release.yml
       - /ci/ref-update.gitlab-ci.yml
 
 variables:
-  RUBY_VERSION: "2.7"
+  RUBY_VERSION: "3.0"
 
 stages:
   - build
   - test
   - deploy