-Source0: http://ftp.gnome.org/pub/GNOME/sources/glibmm/2.30/%{name}-%{version}.tar.xz
-# Source0-md5: 54c803cf95a8d395a55397c723cdb315
-URL: http://www.gtkmm.org/
+Source0: https://download.gnome.org/sources/glibmm/2.64/%{name}-%{version}.tar.xz
+# Source0-md5: a5d54b861f68c5fb34249d906116449b
+URL: https://www.gtkmm.org/