diff --git a/SecurityBulletins.md b/SecurityBulletins.md
index 8c709525..5c32d4d5 100644
--- a/SecurityBulletins.md
+++ b/SecurityBulletins.md
@@ -22,4 +22,5 @@ Qubes Security Bulletins
 
 -   [​Qubes Security Bulletin \#2](https://groups.google.com/d/msg/qubes-devel/JIpZoQUP6dQ/g6TvtpUHzBQJ)
 -   [​Qubes Security Bulletin \#3](https://groups.google.com/group/qubes-devel/msg/2dece13ed1f9ad2d)
+-   [​Qubes Security Bulletin \#4](https://groups.google.com/group/qubes-devel/msg/28ecafd3c73ec1b0)