diff --git a/protobuf.spec b/protobuf.spec
index 4239836..c6c4db5 100644
--- a/protobuf.spec
+++ b/protobuf.spec
@@ -1,5 +1,5 @@
 Name:          protobuf
-Version:       21.11
+Version:       21.12
 Release:       1mamba
 Summary:       A way of encoding structured data in an efficient yet extensible format
 Group:         Development/Tools
@@ -111,6 +111,9 @@ sed -i "\,\.egg-info/,d;s,.*/man/.*,&.gz," %{name}.filelist
 %{python3_sitearch}/protobuf-*-py*.egg-info/*
 
 %changelog
+* Sat Dec 17 2022 Automatic Build System <autodist@mambasoft.it> 21.12-1mamba
+- automatic version update by autodist
+
 * Fri Dec 09 2022 Automatic Build System <autodist@mambasoft.it> 21.11-1mamba
 - automatic version update by autodist