diff --git a/byacc.spec b/byacc.spec
index c7548b5..ec04e6b 100644
--- a/byacc.spec
+++ b/byacc.spec
@@ -1,5 +1,5 @@
 Name:          byacc
-Version:       20210808
+Version:       20211224
 Release:       1mamba
 Summary:       an LALR parser generator.
 Group:         Development/Tools
@@ -52,6 +52,9 @@ make check
 %doc ACKNOWLEDGEMENTS CHANGES NEW_FEATURES NOTES NO_WARRANTY README
 
 %changelog
+* Sat Dec 25 2021 Automatic Build System <autodist@mambasoft.it> 20211224-1mamba
+- automatic version update by autodist
+
 * Mon Aug 09 2021 Automatic Build System <autodist@mambasoft.it> 20210808-1mamba
 - automatic version update by autodist