diff --git a/supplement/colab.html b/supplement/colab.html
index b4c22a5..b5e746e 100644
--- a/supplement/colab.html
+++ b/supplement/colab.html
@@ -650,7 +650,7 @@
 
         <br>
         <div class="date">
-            2023/09/25
+            2024/09/25
         </div>
         <br>
         <div class="tag-placeholder">
diff --git a/supplement/colab.md b/supplement/colab.md
index 55549c8..dd54142 100644
--- a/supplement/colab.md
+++ b/supplement/colab.md
@@ -1,7 +1,7 @@
 ---
 title: Google Colaboratory の使い方
 author: abap34
-date: 2023/09/25
+date: 2024/09/25
 tags: [Google Colaboratory, Python, 環境構築]
 twitter_id: abap34
 github_id: abap34
diff --git a/supplement/preface.html b/supplement/preface.html
index 00230e9..e6dbabc 100644
--- a/supplement/preface.html
+++ b/supplement/preface.html
@@ -650,7 +650,7 @@
 
         <br>
         <div class="date">
-            2023/09/25
+            2024/09/25
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diff --git a/supplement/preface.md b/supplement/preface.md
index 1048a45..07b55cb 100644
--- a/supplement/preface.md
+++ b/supplement/preface.md
@@ -1,7 +1,7 @@
 ---
 title: 機械学習講習会 まえがき
 author: abap34
-date: 2023/09/25
+date: 2024/09/25
 tags: [機械学習講習会]
 twitter_id: abap34
 github_id: abap34