diff --git a/gap-cubefree.spec b/gap-cubefree.spec
index b6281a9..897196b 100644
--- a/gap-cubefree.spec
+++ b/gap-cubefree.spec
@@ -24,7 +24,7 @@ License:        GPL-2.0+
 Group:          Productivity/Scientific/Math
 Url:            http://users.monash.edu.au/~heikod/cubefree.html
 
-Source:         ftp://ftp.gap-system.org/pub/gap/gap4/tar.bz2/packages/cubefree%version.tar.bz2
+Source:         https://www.gap-system.org/pub/gap/gap4/tar.bz2/packages/cubefree%version.tar.bz2
 BuildArch:      noarch
 BuildRoot:      %{_tmppath}/%{name}-%{version}-build
 BuildRequires:  gap-rpm-devel