diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 000000000..ab096fd55
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,16 @@
+name: CI
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: setup ruby
+      uses: eregon/use-ruby-action@master
+      with:
+        ruby-version: 2.7
+    - name: run tests
+      env:
+        TZ: Asia/Tokyo
+      run: ./tutorial/retrospectives/test.sh