README.md in circleci-bundle-update-pr-2.1.0 vs README.md in circleci-bundle-update-pr-3.0.0

@@ -44,10 +44,10 @@
 jobs:
   build:
     # snip
   continuous_bundle_update:
     docker:
-      - image: ruby:2.4.2-alpine
+      - image: ruby:3.0.1-alpine
     working_directory: /work
     steps:
       - run:
           name: Install System Dependencies
           command: |