diff --git a/libvirt-glib.spec b/libvirt-glib.spec
index 91aa9e1..8620fd2 100644
--- a/libvirt-glib.spec
+++ b/libvirt-glib.spec
@@ -1,57 +1,23 @@
 Name:          libvirt-glib
-Version:       3.0.0
+Version:       4.0.0
 Release:       1mamba
 Summary:       A C toolkit to interact with the virtualization capabilities of recent versions of Linux
 Group:         System/Libraries
 Vendor:        openmamba
 Distribution:  openmamba
 Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
-URL:           http://libvirt.org/sources/glib/
-Source:        http://libvirt.org/sources/glib/libvirt-glib-%{version}.tar.gz
+URL:           https://libvirt.org/sources/glib/
+Source:        http://libvirt.org/sources/glib/libvirt-glib-%{version}.tar.xz
 License:       LGPL
 ## AUTOBUILDREQ-BEGIN
 BuildRequires: glibc-devel
-BuildRequires: libaudit-devel
-BuildRequires: libavahi-devel
-BuildRequires: libcap-ng-devel
-BuildRequires: libcares-devel
-BuildRequires: libcurl-devel
-BuildRequires: libdbus-devel
-BuildRequires: libdevmapper-devel
-BuildRequires: libe2fs-devel
-BuildRequires: libffi-devel
-BuildRequires: libgcrypt-devel
 BuildRequires: libglib-devel
-BuildRequires: libgmp-devel
-BuildRequires: libgnutls-devel
-BuildRequires: libgpg-error-devel
-BuildRequires: libidn-devel
-BuildRequires: libkeyutils-devel
-BuildRequires: libkrb5-devel
-BuildRequires: liblzma-devel
-BuildRequires: libnettle-devel
-BuildRequires: libnl-devel
-BuildRequires: libopenldap-devel
-BuildRequires: libopenssl-devel
-BuildRequires: libp11-kit-devel
-BuildRequires: libpython-devel
-BuildRequires: librtmp-devel
-BuildRequires: libsasl-devel
-BuildRequires: libselinux-devel
-BuildRequires: libssh2-devel
-BuildRequires: libssp-devel
-BuildRequires: libsystemd-devel
-BuildRequires: libtasn1-devel
-BuildRequires: libtirpc-devel
 BuildRequires: libvirt-devel
 BuildRequires: libxml2-devel
-BuildRequires: libyajl-devel
-BuildRequires: libz-devel
 ## AUTOBUILDREQ-END
 BuildRequires: libxen-devel >= 4.8.0-1mamba
 Provides:      python-libvirt-glib
-Obsoletes:     python-libvirt-glib
-BuildRoot:     %{_tmppath}/%{name}-%{version}-root
+Obsoletes:     python-libvirt-glib <= 3.0.0
 
 %description
 libvirt is a C toolkit to interact with the virtualization capabilities of recent versions of Linux (and other OSes).
@@ -60,8 +26,7 @@ libvirt is a C toolkit to interact with the virtualization capabilities of recen
 Group:         Development/Libraries
 Summary:       Development files for %{name}
 Requires:      %{name} = %{?epoch:%epoch:}%{version}-%{release}
-## note: you can add this requirement if .pc files are provided by this package
-#Requires:      pkg-config
+Requires:      pkg-config
 
 %description devel
 This package contains libraries and header files for developing applications that use %{name}.
@@ -89,14 +54,13 @@ This package includes the %{name} API documentation.
 %setup -q
 
 %build
-%configure
-#--enable-gtk-doc
+%meson
 
-%make -j1
+%meson_build
 
 %install
 [ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
-%makeinstall
+%meson_install
 
 %find_lang %{name} || touch %{name}.lang
 
@@ -127,11 +91,8 @@ This package includes the %{name} API documentation.
 %{_includedir}/libvirt-glib-1.0/libvirt-glib/*.h
 %dir %{_includedir}/libvirt-gobject-1.0/libvirt-gobject
 %{_includedir}/libvirt-gobject-1.0/libvirt-gobject/*.h
-%{_libdir}/libvirt-gconfig-1.0.la
 %{_libdir}/libvirt-gconfig-1.0.so
-%{_libdir}/libvirt-glib-1.0.la
 %{_libdir}/libvirt-glib-1.0.so
-%{_libdir}/libvirt-gobject-1.0.la
 %{_libdir}/libvirt-gobject-1.0.so
 %{_libdir}/pkgconfig/libvirt-gconfig-1.0.pc
 %{_libdir}/pkgconfig/libvirt-glib-1.0.pc
@@ -139,11 +100,9 @@ This package includes the %{name} API documentation.
 %{_datadir}/gir-1.0/LibvirtGConfig-1.0.gir
 %{_datadir}/gir-1.0/LibvirtGLib-1.0.gir
 %{_datadir}/gir-1.0/LibvirtGObject-1.0.gir
-%{_datadir}/vala/vapi/libvirt-gconfig-1.0.vapi
-%{_datadir}/vala/vapi/libvirt-glib-1.0.vapi
-%{_datadir}/vala/vapi/libvirt-gobject-1.0.deps
-%{_datadir}/vala/vapi/libvirt-gobject-1.0.vapi
-%doc ChangeLog NEWS README
+%{_datadir}/vala/vapi/libvirt-*.vapi
+%{_datadir}/vala/vapi/libvirt-*.deps
+%doc NEWS README
 
 #%files -n python-libvirt-glib
 #%defattr(-,root,root)
@@ -161,6 +120,9 @@ This package includes the %{name} API documentation.
 %{_datadir}/gtk-doc/html/Libvirt-gobject/*
 
 %changelog
+* Wed Apr 28 2021 Silvan Calarco <silvan.calarco@mambasoft.it> 4.0.0-1mamba
+- update to 4.0.0
+
 * Thu May 21 2020 Automatic Build System <autodist@mambasoft.it> 3.0.0-1mamba
 - automatic version update by autodist