diff --git a/.github/workflows/auto-merge-bot-prs.yml b/.github/workflows/auto-merge-bot-prs.yml
new file mode 100644
index 000000000..66e3c3d68
--- /dev/null
+++ b/.github/workflows/auto-merge-bot-prs.yml
@@ -0,0 +1,28 @@
+name: Auto-merge bot PRs
+on:
+  workflow_run:
+    workflows: ["Test this action"]
+    types: [completed]
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  auto-merge:
+    runs-on: ubuntu-latest
+    if: >
+      github.event.workflow_run.conclusion == 'success' &&
+      github.event.workflow_run.event == 'pull_request' &&
+      github.event.workflow_run.actor.login == 'ruby-builder-bot' &&
+      github.event.workflow_run.pull_requests[0].user.login == 'ruby-builder-bot' &&
+      github.event.workflow_run.pull_requests[0].head.repo.full_name == 'ruby-builder-bot/setup-ruby'
+    steps:
+      - name: Merge PR
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          gh pr merge "${{ github.event.workflow_run.pull_requests[0].number }}" \
+            --repo "${{ github.repository }}" \
+            --squash \
+            --delete-branch