diff --git a/sites/jihsgojpidwr/jp/go/jihs/id-info/surveillance-idwr.html b/sites/jihsgojpidwr/jp/go/jihs/id-info/surveillance-idwr.html
index 1ac5bf0af..004fee516 100644
--- a/sites/jihsgojpidwr/jp/go/jihs/id-info/surveillance-idwr.html
+++ b/sites/jihsgojpidwr/jp/go/jihs/id-info/surveillance-idwr.html
@@ -254,8 +254,8 @@
 													</a>
 												</li>
 												<li>
-													<a href="https://id-info.jihs.go.jp/surveillance/idwr/provisional/2026/40/index.html" rel="noopener noreferrer">
-														IDWR速報データ 2026年第40週
+													<a href="https://id-info.jihs.go.jp/surveillance/idwr/provisional/2026/41/index.html" rel="noopener noreferrer">
+														IDWR速報データ 2026年第41週
 													</a>
 												</li>
 											</ul>