diff --git a/SECURITY.md b/SECURITY.md
index 3e13377db6..954ff73a24 100644
--- a/SECURITY.md
+++ b/SECURITY.md
@@ -17,6 +17,6 @@ A "vulnerability in Mastodon" is a vulnerability in the code distributed through
 | ------- | ---------------- |
 | 4.2.x   | Yes              |
 | 4.1.x   | Yes              |
-| 4.0.x   | Until 2023-10-31 |
+| 4.0.x   | No               |
 | 3.5.x   | Until 2023-12-31 |
 | < 3.5   | No               |