diff --git a/package.json b/package.json
index 2c584f6..d43730c 100644
--- a/package.json
+++ b/package.json
@@ -16,7 +16,7 @@
   "author": "Takagi Tasuku",
   "license": "BSD4",
   "dependencies": {
-    "@astrojs/sitemap": "^3.0.5",
+    "@astrojs/sitemap": "^3.1.1",
     "@types/node": "^20.11.19",
     "astro": "^4.4.0",
     "cheerio": "1.0.0-rc.12",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index c5209b5..da77c4a 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -6,8 +6,8 @@ settings:
 
 dependencies:
   '@astrojs/sitemap':
-    specifier: ^3.0.5
-    version: 3.0.5
+    specifier: ^3.1.1
+    version: 3.1.1
   '@types/node':
     specifier: ^20.11.19
     version: 20.11.19
@@ -129,8 +129,8 @@ packages:
       prismjs: 1.29.0
     dev: false
 
-  /@astrojs/sitemap@3.0.5:
-    resolution: {integrity: sha512-60eLzNjMza3ABypiQPUC6ElOSZNZeY5CwSwgJ03hfeonl+Db9x12CCzBFdTw7A5Mq+O54xEZVUrR0tB+yWgX8w==}
+  /@astrojs/sitemap@3.1.1:
+    resolution: {integrity: sha512-qPgdBIcDUaea98mTtLfi5z9oXZpzSjEn/kes70/Ex8FOZZ+DIHVKRYOLOtvy8p+FTXr/9oc7BjmIbTYmYLLJVg==}
     dependencies:
       sitemap: 7.1.1
       zod: 3.22.4