diff --git a/SECURITY.md b/SECURITY.md
index 9a08c4e25..3e13377db 100644
--- a/SECURITY.md
+++ b/SECURITY.md
@@ -15,6 +15,7 @@ A "vulnerability in Mastodon" is a vulnerability in the code distributed through
 
 | Version | Supported        |
 | ------- | ---------------- |
+| 4.2.x   | Yes              |
 | 4.1.x   | Yes              |
 | 4.0.x   | Until 2023-10-31 |
 | 3.5.x   | Until 2023-12-31 |