diff --git a/src/content/tags/advent-calendar.json b/src/content/tags/advent-calendar.json
index 3aa1293..8c84ed4 100644
--- a/src/content/tags/advent-calendar.json
+++ b/src/content/tags/advent-calendar.json
@@ -2,6 +2,10 @@
   "name": "Advent Calendar",
   "description": "12月に部員が投稿するアドベントカレンダーの記事です。",
   "links": [
+    {
+      "url": "https://adventar.org/calendars/12077",
+      "text": "OUCC Advent Calendar 2025 - Adventar"
+    },
     {
       "url": "https://adventar.org/calendars/10655",
       "text": "OUCC Advent Calendar 2024 - Adventar"