diff --git a/cantor.spec b/cantor.spec
index c18a0cc..0e4860c 100644
--- a/cantor.spec
+++ b/cantor.spec
@@ -1,5 +1,5 @@
 Name:          cantor
-Version:       20.12.3
+Version:       21.04.0
 Release:       1mamba
 Summary:       KDE Frontend to Mathematical Software
 Group:         Graphical Desktop/Applications/Educational
@@ -13,7 +13,6 @@ License:       GPL
 ## AUTOBUILDREQ-BEGIN
 BuildRequires: gcc-fortran
 BuildRequires: glibc-devel
-BuildRequires: ldconfig
 BuildRequires: libR-devel
 BuildRequires: libanalitza-devel
 BuildRequires: libattica5-devel
@@ -43,7 +42,7 @@ BuildRequires: libkwindowsystem-devel
 BuildRequires: libkxmlgui-devel
 BuildRequires: libpoppler-devel
 BuildRequires: libpoppler-qt5-devel
-BuildRequires: libpython3
+BuildRequires: libpython39-devel
 BuildRequires: libqalculate-devel
 BuildRequires: libqt5-devel
 BuildRequires: libsolid-devel
@@ -57,8 +56,6 @@ BuildRequires: libpoppler-qt5-devel >= 20.08.0
 BuildRequires: libqalculate-devel >= 2.6.2-1mamba
 BuildRequires: libluajit-devel
 BuildRequires: cmake
-BuildRequires: gcc >= 8.1.0
-#Requires:      kde-workspace
 
 #-- The following OPTIONAL packages have not been found:
 #
@@ -140,6 +137,7 @@ exit 0
 %dir %{_datadir}/kxmlgui5/cantor
 %{_datadir}/kxmlgui5/cantor/cantor_*.rc
 %{_kde5_sharedir}/metainfo/org.kde.cantor.appdata.xml
+%{_datadir}/mime/packages/cantor.xml
 %doc COPYING COPYING.DOC
 
 %files devel
@@ -151,6 +149,9 @@ exit 0
 %{_libdir}/cmake/Cantor/Cantor*.cmake
 
 %changelog
+* Fri Apr 23 2021 Automatic Build System <autodist@mambasoft.it> 21.04.0-1mamba
+- automatic version update by autodist
+
 * Fri Mar 05 2021 Automatic Build System <autodist@mambasoft.it> 20.12.3-1mamba
 - automatic version update by autodist