diff --git a/cantor.spec b/cantor.spec
index 47c6105..c18a0cc 100644
--- a/cantor.spec
+++ b/cantor.spec
@@ -1,5 +1,5 @@
 Name:          cantor
-Version:       20.12.2
+Version:       20.12.3
 Release:       1mamba
 Summary:       KDE Frontend to Mathematical Software
 Group:         Graphical Desktop/Applications/Educational
@@ -59,7 +59,6 @@ BuildRequires: libluajit-devel
 BuildRequires: cmake
 BuildRequires: gcc >= 8.1.0
 #Requires:      kde-workspace
-BuildRoot:     %{_tmppath}/%{name}-%{version}-root
 
 #-- The following OPTIONAL packages have not been found:
 #
@@ -152,6 +151,9 @@ exit 0
 %{_libdir}/cmake/Cantor/Cantor*.cmake
 
 %changelog
+* Fri Mar 05 2021 Automatic Build System <autodist@mambasoft.it> 20.12.3-1mamba
+- automatic version update by autodist
+
 * Thu Feb 04 2021 Automatic Build System <autodist@mambasoft.it> 20.12.2-1mamba
 - automatic version update by autodist