diff --git a/source/index.html.slim b/source/index.html.slim
index a971210..4d10cc4 100644
--- a/source/index.html.slim
+++ b/source/index.html.slim
@@ -43,7 +43,7 @@ section.warn-notice
     = link_to "https://www.twitch.tv/sabaco_waseda"
       | https://www.twitch.tv/sabaco_waseda
   p.text-center
-    = link_to "https://twipla.jp/events/598316"
+    = link_to "https://twipla.jp/events/613689"
       | TwiPla予約ページ
 
 a(name="time_table")