diff --git a/kalzium.spec b/kalzium.spec
index 37f0a05..93c7cce 100644
--- a/kalzium.spec
+++ b/kalzium.spec
@@ -1,5 +1,5 @@
 Name:          kalzium
-Version:       20.12.2
+Version:       20.12.3
 Release:       1mamba
 Summary:       Periodic table of elements
 Group:         Graphical Desktop/Applications/Educational
@@ -43,7 +43,6 @@ Obsoletes:     kalzium4
 Requires:      avogadro
 Requires:      ocaml
 Requires:      python-boost
-BuildRoot:     %{_tmppath}/%{name}-%{version}-root
 
 %description
 Kalzium is an application which will show you some information about the periodic system of the elements.
@@ -130,6 +129,9 @@ exit 0
 %{_kde5_libdir}/libscience.so
 
 %changelog
+* Fri Mar 05 2021 Automatic Build System <autodist@mambasoft.it> 20.12.3-1mamba
+- automatic version update by autodist
+
 * Fri Feb 05 2021 Automatic Build System <autodist@mambasoft.it> 20.12.2-1mamba
 - automatic version update by autodist