diff --git a/cantor.spec b/cantor.spec
index 05181e6..eb5cf6b 100644
--- a/cantor.spec
+++ b/cantor.spec
@@ -1,5 +1,5 @@
 Name:          cantor
-Version:       21.12.2
+Version:       21.12.3
 Release:       1mamba
 Summary:       KDE Frontend to Mathematical Software
 Group:         Graphical Desktop/Applications/Educational
@@ -158,6 +158,9 @@ exit 0
 %{_libdir}/cmake/Cantor/Cantor*.cmake
 
 %changelog
+* Thu Mar 03 2022 Automatic Build System <autodist@mambasoft.it> 21.12.3-1mamba
+- automatic version update by autodist
+
 * Fri Feb 04 2022 Automatic Build System <autodist@mambasoft.it> 21.12.2-1mamba
 - automatic version update by autodist