diff --git a/README.md b/README.md
index c8d491d..ebb9b83 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,2 @@
 # ocaml-dtools
 
-OCaml daemon tools library.
-
diff --git a/ocaml-dtools.spec b/ocaml-dtools.spec
index c5d6a89..df0dfa0 100644
--- a/ocaml-dtools.spec
+++ b/ocaml-dtools.spec
@@ -1,20 +1,30 @@
 Name:          ocaml-dtools
-Version:       0.3.1
+Version:       0.4.2
 Release:       1mamba
 Summary:       OCaml modules for writing daemons
 Group:         Development/Libraries
 Vendor:        openmamba
 Distribution:  openmamba
-Packager:      Davide Madrisan <davide.madrisan@gmail.com>
+Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
 URL:           https://github.com/savonet/ocaml-dtools
-Source:        http://downloads.sourceforge.net/project/savonet/ocaml-dtools/%{version}/ocaml-dtools-%{version}.tar.gz
+Source:        https://github.com/savonet/ocaml-dtools.git/%{version}/ocaml-dtools-%{version}.tar.bz2
 License:       GPL
 ## AUTOBUILDREQ-BEGIN
-## AUTOBUILDREQ-END
+BuildRequires: glibc-devel
+BuildRequires: ocaml
+## AUTOBUILDREQ-END
+BuildRequires: dune
 BuildRequires: ocaml
-BuildRoot:     %{_tmppath}/%{name}-%{version}-root
 
-# FIXME: checking for ocaml syslog module... Not found.
+%package devel
+Group:         Development/Libraries/OCaml
+Summary:       Development files for %{name}
+Requires:      %{name} = %{?epoch:%epoch:}%{version}-%{release}
+
+%description devel
+This package contains libraries and signature files for developing applications that use %{name}.
+
+%debug_package
 
 %description
 OCaml daemon tools library.
@@ -23,29 +33,36 @@ OCaml daemon tools library.
 %setup -q
 
 %build
-./configure --prefix=%{_prefix}
-%make all
+dune build
 
 %install
 [ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
-export OCAMLFIND_DESTDIR=$RPM_BUILD_ROOT$(ocamlfind printconf destdir)
-install -d $OCAMLFIND_DESTDIR
-make install
+DESTDIR="%{buildroot}" dune install --prefix "/usr" --libdir "%{_lib}/ocaml"
+
+rm -rf %{buildroot}/usr/doc
 
 %clean
 [ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
 
 %files
 %defattr(-,root,root)
-%{_libdir}/ocaml/dtools/META
+%dir %{_libdir}/ocaml/dtools
+%{_libdir}/ocaml/dtools/*
+%exclude %{_libdir}/ocaml/dtools/dtools.a
+%exclude %{_libdir}/ocaml/dtools/dtools.cmx
+%exclude %{_libdir}/ocaml/dtools/dtools.cmxa
+%doc COPYING
+
+%files devel
+%defattr(-,root,root)
 %{_libdir}/ocaml/dtools/dtools.a
-%{_libdir}/ocaml/dtools/dtools.cma
-%{_libdir}/ocaml/dtools/dtools.cmi
 %{_libdir}/ocaml/dtools/dtools.cmx
 %{_libdir}/ocaml/dtools/dtools.cmxa
-%{_libdir}/ocaml/dtools/dtools.mli
-%doc COPYING CHANGES README
+%doc CHANGES README.md
 
 %changelog
+* Fri Feb 19 2021 Silvan Calarco <silvan.calarco@mambasoft.it> 0.4.2-1mamba
+- update to 0.4.2
+
 * Sat Jun 22 2013 Davide Madrisan <davide.madrisan@gmail.com> 0.3.1-1mamba
 - package created by autospec