diff --git a/protobuf.spec b/protobuf.spec
index af3b922..28b013d 100644
--- a/protobuf.spec
+++ b/protobuf.spec
@@ -1,5 +1,5 @@
 Name:          protobuf
-Version:       21.3
+Version:       21.4
 Release:       1mamba
 Summary:       A way of encoding structured data in an efficient yet extensible format
 Group:         Development/Tools
@@ -113,6 +113,9 @@ sed -i "\,\.egg-info/,d;s,.*/man/.*,&.gz," %{name}.filelist
 %{python3_sitearch}/protobuf-*-py*.egg-info/*
 
 %changelog
+* Tue Jul 26 2022 Automatic Build System <autodist@mambasoft.it> 21.4-1mamba
+- automatic version update by autodist
+
 * Thu Jul 21 2022 Automatic Build System <autodist@mambasoft.it> 21.3-1mamba
 - automatic version update by autodist