diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 00000000..52c1ab6e
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,18 @@
+# https://docs.github.com/en/code-security/dependabot/working-with-dependabot/dependabot-options-reference
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"
+      time: "00:00"
+    labels:
+      - "ci"
+      - "skip-changelog"
+    pull-request-branch-name:
+      separator: "-"
+    open-pull-requests-limit: 10
+    reviewers:
+      - "akihironitta"
+    assignees:
+      - "akihironitta"
diff --git a/.github/workflows/dependabot-auto-merge.yml b/.github/workflows/dependabot-auto-merge.yml
new file mode 100644
index 00000000..51bf9bd3
--- /dev/null
+++ b/.github/workflows/dependabot-auto-merge.yml
@@ -0,0 +1,21 @@
+name: Dependabot auto-merge
+
+on:  # yamllint disable-line rule:truthy
+  pull_request:
+    branches:
+      - master
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  dependabot:
+    runs-on: ubuntu-latest
+    if: ${{ github.actor == 'dependabot[bot]' }}
+    steps:
+      - name: Enable auto-merge for Dependabot PRs
+        run: gh pr merge --auto --merge "$PR_URL"
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}