diff --git a/.github/workflows/stale.yml b/.github/workflows/stale.yml
new file mode 100644
index 0000000..2e5f7e7
--- /dev/null
+++ b/.github/workflows/stale.yml
@@ -0,0 +1,11 @@
+name: stale
+on:
+  schedule: [cron: "0 1 * * 1"]
+jobs:
+  main:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/stale@v4
+        with:
+          stale-issue-message: このIssueは最終更新日から365日以上経過しています。
+          days-before-stale: 365