diff --git a/protobuf.spec b/protobuf.spec
index 95468b0..d098181 100644
--- a/protobuf.spec
+++ b/protobuf.spec
@@ -1,15 +1,14 @@
 Name:          protobuf
-Version:       3.12.4
-Release:       2mamba
+Version:       3.15.6
+Release:       1mamba
 Summary:       A way of encoding structured data in an efficient yet extensible format
 Group:         Development/Tools
 Vendor:        openmamba
 Distribution:  openmamba
 Packager:      Ercole 'ercolinux' Carpanetto <ercole69@gmail.com>
-URL:           http://code.google.com/p/protobuf/
+URL:           https://code.google.com/p/protobuf/
 Source:        https://github.com/google/protobuf.git/v%{version}/protobuf-%{version}.tar.bz2
 License:       BSD
-BuildRoot:     %{_tmppath}/%{name}-%{version}-root
 ## AUTOBUILDREQ-BEGIN
 BuildRequires: glibc-devel
 BuildRequires: libgcc
@@ -111,6 +110,24 @@ sed -i "s,.*/man/.*,&.gz," %{name}.filelist
 %defattr(-,root,root)
 
 %changelog
+* Fri Mar 12 2021 Automatic Build System <autodist@mambasoft.it> 3.15.6-1mamba
+- automatic version update by autodist
+
+* Sat Mar 06 2021 Automatic Build System <autodist@mambasoft.it> 3.15.5-1mamba
+- automatic version update by autodist
+
+* Fri Mar 05 2021 Automatic Build System <autodist@mambasoft.it> 3.15.4-1mamba
+- automatic version update by autodist
+
+* Fri Feb 26 2021 Automatic Build System <autodist@mambasoft.it> 3.15.3-1mamba
+- automatic version update by autodist
+
+* Thu Feb 25 2021 Automatic Build System <autodist@mambasoft.it> 3.15.2-1mamba
+- automatic version update by autodist
+
+* Sun Feb 21 2021 Automatic Build System <autodist@mambasoft.it> 3.15.1-1mamba
+- automatic version update by autodist
+
 * Sun Jan 31 2021 Silvan Calarco <silvan.calarco@mambasoft.it> 3.12.4-2mamba
 - added python subpackage