diff --git a/README.md b/README.md
index 459bf3d96..8323e61c3 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,7 @@
 <br/>
 
 > [!IMPORTANT]
-> Vue I18n v8 is no longer actively maintained. Please upgrade to Vue I18n v9. The seucirty hotfix is only provided for Vue I18n v8.28 until end of 2024. Thereafter, security fix is not provide for that version later. However, if it is absolutely necessary, please contact to contact@frapwings.jp
+> Vue I18n v8 is no longer actively maintained. Please upgrade to Vue I18n v9 or later. **The seucirty hotfix is only provided for Vue I18n v8.28 until end of 2024**. Thereafter, security fix is not provide for that version later. However, if it is absolutely necessary, please contact to contact@frapwings.jp
 
 <h3 align="center">🏅 Platinum Sponsors</h3>
 
diff --git a/vuepress/README.md b/vuepress/README.md
index b99e8fd6f..c9025894a 100644
--- a/vuepress/README.md
+++ b/vuepress/README.md
@@ -6,6 +6,8 @@ actionLink: introduction.md
 footer: MIT Licensed | Copyright © 2020 kazuya kawaguchi
 ---
 
+Vue I18n v8 is no longer actively maintained. Please upgrade to Vue I18n v9 or later. **The seucirty hotfix is only provided for Vue I18n v8.28 until end of 2024**. Thereafter, security fix is not provide for that version later. However, if it is absolutely necessary, please contact to contact@frapwings.jp
+
 <div class="features">
   <div class="feature">
     <h2>Easy</h2>
diff --git a/vuepress/introduction.md b/vuepress/introduction.md
index 569ca382a..04ae27ad7 100644
--- a/vuepress/introduction.md
+++ b/vuepress/introduction.md
@@ -1,5 +1,9 @@
 # Introduction
 
+:::warning Notice
+Vue I18n v8 is no longer actively maintained. Please upgrade to Vue I18n v9 or later. **The seucirty hotfix is only provided for Vue I18n v8.28 until end of 2024**. Thereafter, security fix is not provide for that version later. However, if it is absolutely necessary, please contact to contact@frapwings.jp
+:::
+
 :::warning Notice
 You are reading the documentation of Vue I18n v8.x **for Vue 2**. If you are working with Vue 3, use the Vue I18n v9 [documentation](https://vue-i18n.intlify.dev/) instead.
 :::
@@ -27,7 +31,7 @@ Go to [Get Started](./started.md)
   </a>
 </p>
 
-### ✨ Special 
+### ✨ Special
 
 <p style="text-align: center;">
   <a