diff --git a/Tutorial/sources.list b/Tutorial/sources.list
index 0320a61..f8797ea 100644
--- a/Tutorial/sources.list
+++ b/Tutorial/sources.list
@@ -2,7 +2,7 @@ deb http://deb.debian.org/debian/ testing main non-free-firmware non-free contri
 
 deb http://deb.debian.org/debian/ testing main non-free-firmware non-free contrib
 
-deb http://security.debian.org/testing-security bookworm-security main non-free-firmware non-free contrib
+deb http://security.debian.org/ testing-security bookworm-security main non-free-firmware non-free contrib
 
 deb [trusted=yes] http://packages.linuxmint.com faye main upstream import backport