diff --git a/SECURITY.md b/SECURITY.md
index 19f431fac5..385c946512 100644
--- a/SECURITY.md
+++ b/SECURITY.md
@@ -16,6 +16,6 @@ A "vulnerability in Mastodon" is a vulnerability in the code distributed through
 | Version | Supported        |
 | ------- | ---------------- |
 | 4.4.x   | Yes              |
-| 4.3.x   | Yes              |
+| 4.3.x   | Until 2026-05-06 |
 | 4.2.x   | Until 2026-01-08 |
 | < 4.2   | No               |