diff --git a/gap-numericalsgps.spec b/gap-numericalsgps.spec
index 225993a..552aa8c 100644
--- a/gap-numericalsgps.spec
+++ b/gap-numericalsgps.spec
@@ -24,7 +24,7 @@ License:        GPL-2.0+
 Group:          Productivity/Scientific/Math
 URL:            http://www.fc.up.pt/cmup/mdelgado/numericalsgps/
 
-Source:         http://www.gap-system.org/pub/gap/gap4/tar.bz2/packages/numericalsgps-%version.tar.bz2
+Source:         https://www.gap-system.org/pub/gap/gap4/tar.bz2/packages/numericalsgps-%version.tar.bz2
 BuildArch:      noarch
 BuildRoot:      %{_tmppath}/%{name}-%{version}-build
 BuildRequires:  gap-rpm-devel