diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 0000000..bd93da3
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,26 @@
+# 依存パッケージの定期更新 PR（Dependabot version updates）
+# 脆弱性検出（Dependabot alerts / security updates）はリポジトリ設定で有効化済み（本ファイルとは独立に動く）
+version: 2
+updates:
+  - package-ecosystem: "uv"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 5
+    commit-message:
+      prefix: "[update]"
+    groups:
+      minor-and-patch:
+        update-types:
+          - "minor"
+          - "patch"
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    commit-message:
+      prefix: "[update]"
+    groups:
+      actions:
+        patterns:
+          - "*"