diff --git a/libosip2.spec b/libosip2.spec
index 0da835e..6793198 100644
--- a/libosip2.spec
+++ b/libosip2.spec
@@ -1,5 +1,5 @@
 Name:          libosip2
-Version:       5.2.0
+Version:       5.2.1
 Release:       1mamba
 Summary:       An implementation of SIP
 Group:         System/Libraries
@@ -11,8 +11,8 @@ Source:        http://ftp.gnu.org/gnu/osip/libosip2-%{version}.tar.gz
 License:       LGPL
 ## AUTOBUILDREQ-BEGIN
 BuildRequires: glibc-devel
+BuildRequires: libnsl-devel
 ## AUTOBUILDREQ-END
-BuildRoot:     %{_tmppath}/%{name}-%{version}-root
 
 %description
 oSIP is an implementation of SIP.
@@ -70,6 +70,9 @@ This package contains static libraries and header files need for development.
 %doc BUGS ChangeLog NEWS README TODO
 
 %changelog
+* Wed May 26 2021 Automatic Build System <autodist@mambasoft.it> 5.2.1-1mamba
+- automatic version update by autodist
+
 * Sat Feb 20 2021 Automatic Build System <autodist@mambasoft.it> 5.2.0-1mamba
 - automatic version update by autodist