diff --git a/gap-gbnp.spec b/gap-gbnp.spec
index 4427882..3c41592 100644
--- a/gap-gbnp.spec
+++ b/gap-gbnp.spec
@@ -24,7 +24,7 @@ License:        LGPL-2.1+
 Group:          Productivity/Scientific/Math
 URL:            http://mathdox.org/products/gbnp/
 
-Source:         ftp://ftp.gap-system.org/pub/gap/gap4/tar.bz2/packages/GBNP-%version.tar.bz2
+Source:         https://www.gap-system.org/pub/gap/gap4/tar.bz2/packages/GBNP-%version.tar.bz2
 BuildArch:      noarch
 BuildRoot:      %{_tmppath}/%{name}-%{version}-build
 BuildRequires:  fdupes