diff --git a/.docker/ruby/Dockerfile b/.docker/ruby/Dockerfile
index af3a8643..f9480dc2 100644
--- a/.docker/ruby/Dockerfile
+++ b/.docker/ruby/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:2.7
+FROM ruby:3.1
 
 USER root
 
diff --git a/.github/workflows/retrospring.yml b/.github/workflows/retrospring.yml
index da84ad76..1ddc0f16 100644
--- a/.github/workflows/retrospring.yml
+++ b/.github/workflows/retrospring.yml
@@ -47,6 +47,7 @@ jobs:
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
+          ruby-version: '3.1'
           bundler-cache: true
       - name: Set up Node 12
         uses: actions/setup-node@v3