diff --git a/supermin.spec b/supermin.spec
index 0e77878..fd7e48c 100644
--- a/supermin.spec
+++ b/supermin.spec
@@ -1,19 +1,19 @@
 Name:          supermin
 Version:       5.1.20
-Release:       1mamba
+Release:       2mamba
 Summary:       Tool for creating supermin appliances (formerly called febootstrap)
 Group:         System/Tools
 Vendor:        openmamba
 Distribution:  openmamba
 Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
-URL:           http://people.redhat.com/~rjones/supermin/
+URL:           https://people.redhat.com/~rjones/supermin/
 Source:        http://libguestfs.org/download/supermin/supermin-%{version}.tar.gz
 License:       GPL
 ## AUTOBUILDREQ-BEGIN
 BuildRequires: glibc-devel
 BuildRequires: libe2fs-devel
 ## AUTOBUILDREQ-END
-BuildRoot:     %{_tmppath}/%{name}-%{version}-root
+BuildRequires: librpm-devel >= 4.16.1.2-1mamba
 
 %description
 Tool for creating supermin appliances (formerly called febootstrap).
@@ -41,6 +41,9 @@ Tool for creating supermin appliances (formerly called febootstrap).
 %doc COPYING
 
 %changelog
+* Sun Mar 07 2021 Silvan Calarco <silvan.calarco@mambasoft.it> 5.1.20-2mamba
+- rebuilt by autoport with build requirements: librpm-devel>=4.16.1.2-1mamba
+
 * Tue Oct 15 2019 Automatic Build System <autodist@mambasoft.it> 5.1.20-1mamba
 - automatic version update by autodist