- deb http://cdn.debian.net/debian/ testing main contrib non-free
-# deb-src http://cdn.debian.net/debian/ testing main contrib non-free
+ deb http://http.debian.net/debian/ testing main contrib non-free
+ deb-src http://http.debian.net/debian/ testing main contrib non-free
+
+# security updates:
+ deb http://security.debian.org/ testing/updates main contrib
+ deb-src http://security.debian.org/ testing/updates main contrib