diff --git a/libgtkmm.spec b/libgtkmm.spec
index 3c49dae..72d3db7 100644
--- a/libgtkmm.spec
+++ b/libgtkmm.spec
@@ -1,34 +1,32 @@
 %define        majversion  %(echo %version | cut -d. -f 1-2)
+%define        apiver  %(echo %version | cut -d. -f 1-2)
 
 Name:          libgtkmm
-Version:       3.24.2
+Version:       4.0.1
 Release:       1mamba
 Summary:       gtkmm is the official C++ interface for the popular GUI library GTK+
 Group:         System/Libraries
 Vendor:        openmamba
 Distribution:  openmamba
 Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
-URL:           http://gtkmm.sourceforge.net
-Source:        http://ftp.gnome.org/pub/GNOME/sources/gtkmm/%{majversion}/gtkmm-%{version}.tar.xz
+URL:           https://gtkmm.sourceforge.net
+Source:        https://download.gnome.org/sources/gtkmm/%{majversion}/gtkmm-%{version}.tar.xz
 License:       LGPL
-## AUTOBUILDREQ-BEGINBuildRequires: glibc-devel
-BuildRequires: libatk-devel
-BuildRequires: libatkmm-devel
+## AUTOBUILDREQ-BEGIN
+BuildRequires: glibc-devel
 BuildRequires: libcairo-devel
 BuildRequires: libcairomm-devel
 BuildRequires: libgcc
 BuildRequires: libgdk-pixbuf-devel
 BuildRequires: libglib-devel
 BuildRequires: libglibmm-devel
+BuildRequires: libgraphene-devel
 BuildRequires: libgtk-devel
-BuildRequires: libharfbuzz-devel
-BuildRequires: libpango-devel
 BuildRequires: libpangomm-devel
 BuildRequires: libsigc++-devel
 BuildRequires: libstdc++6-devel
 ## AUTOBUILDREQ-END
 BuildRequires: pkgconfig >= 0.15.0
-BuildRoot:     %{_tmppath}/%{name}-%{version}-buildroot
 
 %description
 Gtkmm (previously known as Gtk--) is the official C++ interface for the popular GUI library GTK+. It closely follows GTK+ development.
@@ -42,19 +40,21 @@ Requires:      %{name} = %{?epoch:%epoch:}%{version}-%{release}
 %description devel
 gtkmm (previously known as Gtk--) is the official C++ interface for the popular GUI library GTK+. It closely follows GTK+ development.
 Highlights include typesafe callbacks, widgets extensible via inheritance and a comprehensive set of widget classes that can be freely combined to quickly create complex user interfaces.
+This package contains static libraries and header files needed for development.
 
-This package contains static libraries and header files need for development.
+%debug_package
 
 %prep
 %setup -q -n gtkmm-%{version}
 
-%configure
-%make
+%build
+%meson
 
+%meson_build
 
 %install
 [ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
-%makeinstall
+%meson_install
 
 %clean
 [ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
@@ -64,25 +64,28 @@ This package contains static libraries and header files need for development.
 
 %files
 %defattr(-,root,root)
-%{_libdir}/libgdkmm-*.so.*
-%{_libdir}/libgtkmm-*.so.*
+%{_libdir}/libgtkmm-%{apiver}.so.*
+%doc COPYING
 
 %files devel
 %defattr(-,root,root)
-%{_includedir}/*
-%{_libdir}/*.la
-%{_libdir}/*.so
-%{_libdir}/pkgconfig/gdkmm-*.pc
-%{_libdir}/pkgconfig/gtkmm-*.pc
-%dir %{_libdir}/gtkmm-?.?/include
-%{_libdir}/gtkmm-?.?/include/*.h
-%{_libdir}/gdkmm-?.?/include/gdkmmconfig.h
-%{_libdir}/gtkmm-?.?/proc/m4/*.m4
-%{_datadir}/devhelp/books/gtkmm-*
-%{_docdir}/gtkmm-?.?/images
-%{_docdir}/gtkmm-?.?/reference
+%dir %{_includedir}/gtkmm-%{apiver}
+%{_includedir}/gtkmm-%{apiver}/gdkmm.h
+%{_includedir}/gtkmm-%{apiver}/gtkmm.h
+%dir %{_includedir}/gtkmm-%{apiver}/gdkmm
+%{_includedir}/gtkmm-%{apiver}/gdkmm/*
+%dir %{_includedir}/gtkmm-%{apiver}/gtkmm
+%{_includedir}/gtkmm-%{apiver}/gtkmm/*
+%dir %{_libdir}/gtkmm-%{apiver}/include
+%{_libdir}/gtkmm-%{apiver}/include/*.h
+%{_libdir}/libgtkmm-%{apiver}.so
+%{_libdir}/pkgconfig/gtkmm-%{apiver}.pc
+%{_libdir}/gtkmm-%{apiver}/proc/m4/*.m4
 
 %changelog
+* Sun Apr 18 2021 Automatic Build System <autodist@mambasoft.it> 4.0.1-1mamba
+- automatic version update by autodist
+
 * Fri Nov 01 2019 Silvan Calarco <silvan.calarco@mambasoft.it> 3.24.2-1mamba
 - update to 3.24.2