diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index fdb62e88..1024e697 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -181,12 +181,28 @@ jobs:
       - id: diff
         run: tools/ci/manifest.sh
         if: github.repository_owner == 'taiki-e' && (github.event_name == 'schedule' || github.event_name == 'push' && github.ref == 'refs/heads/main')
-      - uses: peter-evans/create-pull-request@v5
+      - name: Create PR
+        id: create-pull-request
+        uses: peter-evans/create-pull-request@v5
         with:
           title: Update manifest
           body: |
-            Auto-generated by [create-pull-request](https://github.com/peter-evans/create-pull-request)
+            Auto-generated by [create-pull-request](https://github.com/peter-evans/create-pull-request).
+
+            This will be auto-merged when CI has passed because this is an auto-generated PR in a defined format and is usually considered no additional review is required.
           branch: update-manifest
           token: ${{ secrets.CREATE_PR_TOKEN }}
         if: github.repository_owner == 'taiki-e' && (github.event_name == 'schedule' || github.event_name == 'push' && github.ref == 'refs/heads/main') && steps.diff.outputs.success == 'false'
+      - name: Enable auto-merge for auto-generated PR
+        run: gh pr merge --rebase --auto "${PR_NUMBER:?}"
+        env:
+          GITHUB_TOKEN: ${{ secrets.CREATE_PR_TOKEN }}
+          PR_NUMBER: ${{ steps.create-pull-request.outputs.pull-request-number }}
+        if: github.repository_owner == 'taiki-e' && (github.event_name == 'schedule' || github.event_name == 'push' && github.ref == 'refs/heads/main') && steps.diff.outputs.success == 'false' && steps.create-pull-request.outputs.pull-request-operation == 'created'
+      - name: Auto approve for auto-generated PR
+        run: gh pr review --approve "${PR_NUMBER:?}"
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          PR_NUMBER: ${{ steps.create-pull-request.outputs.pull-request-number }}
+        if: github.repository_owner == 'taiki-e' && (github.event_name == 'schedule' || github.event_name == 'push' && github.ref == 'refs/heads/main') && steps.diff.outputs.success == 'false' && steps.create-pull-request.outputs.pull-request-operation == 'created'
       - run: git add -N . && git diff --exit-code