diff --git a/gap-semigroups.spec b/gap-semigroups.spec
index ecb2a8d..3a77d4e 100644
--- a/gap-semigroups.spec
+++ b/gap-semigroups.spec
@@ -24,7 +24,7 @@ License:        GPL-2.0+
 Group:          Productivity/Scientific/Math
 Url:            http://www-groups.mcs.st-and.ac.uk/~jamesm/semigroups
 
-Source:         ftp://ftp.gap-system.org/pub/gap/gap4/tar.bz2/packages/semigroups-%version.tar.bz2
+Source:         https://www.gap-system.org/pub/gap/gap4/tar.bz2/packages/semigroups-%version.tar.bz2
 BuildArch:      noarch
 BuildRequires:  gap-devel >= 4.8.3
 BuildRequires:  gap-rpm-devel