diff --git a/url_updates.txt b/url_updates.txt
index acf180c..d56a168 100644
--- a/url_updates.txt
+++ b/url_updates.txt
@@ -9,4 +9,5 @@ repo.45drives.com
 d3fo0g5hm7lbuv.cloudfront.net
 packagecloud.io
 archive.raspberrypi.org
-archive.ubuntu.com
\ No newline at end of file
+archive.ubuntu.com
+security.debian.org
\ No newline at end of file