diff --git a/helpers/make-ubuntu-release-upgrader b/helpers/make-ubuntu-release-upgrader
index 58f935f..fe6243d 100644
--- a/helpers/make-ubuntu-release-upgrader
+++ b/helpers/make-ubuntu-release-upgrader
@@ -239,7 +239,6 @@ https://mirror.csclub.uwaterloo.ca/trisquel/packages/
 https://ftpmirror1.infania.net/mirror/trisquel/packages/
 https://mirrors.nju.edu.cn/trisquel/
 https://mirror.math.princeton.edu/pub/trisquel-packages/
-https://mirror.operationtulip.com/trisquel/packages/
 https://mirrors.dotsrc.org/trisquel/
 EOF