diff --git a/cantor.spec b/cantor.spec
index c8bf71a..c2b0b9a 100644
--- a/cantor.spec
+++ b/cantor.spec
@@ -1,5 +1,5 @@
 Name:          cantor
-Version:       19.08.3
+Version:       19.12.0
 Release:       1mamba
 Summary:       KDE Frontend to Mathematical Software
 Group:         Graphical Desktop/Applications/Educational
@@ -7,7 +7,7 @@ Vendor:        openmamba
 Distribution:  openmamba
 Packager:      Davide Madrisan <davide.madrisan@gmail.com>
 URL:           http://www.kde.org
-Source:        http://download.kde.org/stable/applications/%{version}/src/cantor-%{version}.tar.xz
+Source:        http://download.kde.org/stable/release-service/%{version}/src/cantor-%{version}.tar.xz
 License:       GPL
 ## AUTOBUILDREQ-BEGIN
 BuildRequires: R
@@ -115,7 +115,9 @@ exit 0
 %{_bindir}/cantor_scripteditor
 %{_bindir}/cantor_python2server
 %{_bindir}/cantor_python3server
+%ifarch %{ix86}
 %{_kde5_bindir}/cantor_rserver
+%endif
 #%config %{_kde5_configdir}/cantor*.knsrc
 %{_kde5_datadir}/cantor
 %{_kde5_icondir}/hicolor/*/apps/*.png
@@ -159,6 +161,9 @@ exit 0
 %{_libdir}/cmake/Cantor/Cantor*.cmake
 
 %changelog
+* Tue Dec 31 2019 Automatic Build System <autodist@mambasoft.it> 19.12.0-1mamba
+- automatic version update by autodist
+
 * Thu Nov 07 2019 Automatic Build System <autodist@mambasoft.it> 19.08.3-1mamba
 - automatic version update by autodist