diff --git a/README.md b/README.md
index c5055e47..87656427 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,12 @@
+> [!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 Vue I18n v8 is no longer actively maintained.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
+
@@ -59,7 +65,7 @@