diff --git a/cantor.spec b/cantor.spec
index c684010..54d1a77 100644
--- a/cantor.spec
+++ b/cantor.spec
@@ -1,5 +1,5 @@
 Name:          cantor
-Version:       20.08.3
+Version:       20.12.0
 Release:       1mamba
 Summary:       KDE Frontend to Mathematical Software
 Group:         Graphical Desktop/Applications/Educational
@@ -43,7 +43,7 @@ BuildRequires: libkwindowsystem-devel
 BuildRequires: libkxmlgui-devel
 BuildRequires: libpoppler-devel
 BuildRequires: libpoppler-qt5-devel
-BuildRequires: libpython33
+BuildRequires: libpython3
 BuildRequires: libqalculate-devel
 BuildRequires: libqt5-devel
 BuildRequires: libsolid-devel
@@ -82,7 +82,7 @@ Requires:      %{name} = %{?epoch:%epoch:}%{version}-%{release}
 %description devel
 Cantor is a front-end to powerful mathematics and statistics packages.
 Cantor integrates them into the KDE Platform and provides a nice, worksheet-based, graphical user interface.
-This package contains static libraries and header files need for development.
+This package contains static libraries and header files needed for development.
 
 %debug_package
 
@@ -98,7 +98,7 @@ This package contains static libraries and header files need for development.
 [ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
 %makeinstall -C build
 
-%find_lang %{name}5_qt --with-qt --all-name || touch %{name}5_qt.lang
+%find_lang %{name}5_qt --with-qt --with-html --all-name || touch %{name}5_qt.lang
 
 %clean
 [ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
@@ -125,7 +125,6 @@ exit 0
 
 %files -f %{name}5_qt.lang
 %defattr(-,root,root)
-%{_sysconfdir}/xdg/cantor*.knsrc
 %{_bindir}/cantor
 %{_bindir}/cantor_*
 %{_kde5_datadir}/cantor
@@ -138,27 +137,10 @@ exit 0
 %{_libdir}/qt5/plugins/cantor/*
 %{_libdir}/qt5/plugins/libcantorpart.so
 %{_datadir}/applications/org.kde.cantor.desktop
-#%dir %{_datadir}/kservices5/cantor/
-#%{_datadir}/kservices5/cantor/*.desktop
-#%dir %{_datadir}/kservicetypes5
-#%{_datadir}/kservicetypes5/cantor_*.desktop
+%{_datadir}/knsrcfiles/cantor*
 %dir %{_datadir}/kxmlgui5/cantor
 %{_datadir}/kxmlgui5/cantor/cantor_*.rc
 %{_kde5_sharedir}/metainfo/org.kde.cantor.appdata.xml
-%doc %lang(en) %{_kde5_htmldir}/en/cantor
-%doc %lang(ca) %{_kde5_htmldir}/ca/cantor
-%doc %lang(de) %{_kde5_htmldir}/de/cantor
-%doc %lang(es) %{_kde5_htmldir}/es/cantor
-%doc %lang(et) %{_kde5_htmldir}/et/cantor
-%doc %lang(fr) %{_kde5_htmldir}/fr/cantor
-%doc %lang(gl) %{_kde5_htmldir}/gl/cantor
-%doc %lang(it) %{_kde5_htmldir}/it/cantor
-%doc %lang(nl) %{_kde5_htmldir}/nl/cantor
-%doc %lang(pt) %{_kde5_htmldir}/pt/cantor
-%doc %lang(pt_BR) %{_kde5_htmldir}/pt_BR/cantor
-%doc %lang(ru) %{_kde5_htmldir}/ru/cantor
-%doc %lang(sv) %{_kde5_htmldir}/sv/cantor
-%doc %lang(uk) %{_kde5_htmldir}/uk/cantor
 %doc COPYING COPYING.DOC
 
 %files devel
@@ -170,6 +152,9 @@ exit 0
 %{_libdir}/cmake/Cantor/Cantor*.cmake
 
 %changelog
+* Fri Dec 18 2020 Automatic Build System <autodist@mambasoft.it> 20.12.0-1mamba
+- automatic version update by autodist
+
 * Thu Nov 05 2020 Automatic Build System <autodist@mambasoft.it> 20.08.3-1mamba
 - automatic version update by autodist