diff --git a/byacc.spec b/byacc.spec
index eb24bf1..03db6ec 100644
--- a/byacc.spec
+++ b/byacc.spec
@@ -1,5 +1,5 @@
 Name:          byacc
-Version:       20200910
+Version:       20210109
 Release:       1mamba
 Summary:       an LALR parser generator.
 Group:         Development/Tools
@@ -53,6 +53,9 @@ make check
 %doc ACKNOWLEDGEMENTS CHANGES NEW_FEATURES NOTES NO_WARRANTY README
 
 %changelog
+* Sun Jan 10 2021 Automatic Build System <autodist@mambasoft.it> 20210109-1mamba
+- automatic version update by autodist
+
 * Sat Sep 12 2020 Automatic Build System <autodist@mambasoft.it> 20200910-1mamba
 - automatic update by autodist