diff --git a/ocaml-duppy.spec b/ocaml-duppy.spec
index 43240e1..0e84303 100644
--- a/ocaml-duppy.spec
+++ b/ocaml-duppy.spec
@@ -1,25 +1,27 @@
 %define ocamlpck  duppy
 
 Name:          ocaml-duppy
-Version:       0.5.1
-Release:       3mamba
+Version:       0.9.0
+Release:       1mamba
 Summary:       Ocaml-duppy is an advanced scheduler for Ocaml programmers
 Group:         Development/Libraries
 Vendor:        openmamba
 Distribution:  openmamba
-Packager:      Davide Madrisan <davide.madrisan@gmail.com>
-URL:           http://www.dolebrai.net/duppy.html
-Source:        http://downloads.sourceforge.net/project/savonet/ocaml-duppy/%{version}/ocaml-duppy-%{version}.tar.gz
+Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
+URL:           https://www.dolebrai.net/duppy.html
+Source:        https://github.com/savonet/ocaml-duppy.git/v%{version}/ocaml-duppy-%{version}.tar.bz2
 License:       LGPL
 ## AUTOBUILDREQ-BEGIN
 BuildRequires: glibc-devel
+BuildRequires: ocaml
+BuildRequires: ocaml-pcre-devel
 ## AUTOBUILDREQ-END
+BuildRequires: dune
 BuildRequires: gcc
 BuildRequires: ocaml
 BuildRequires: ocaml-findlib
 BuildRequires: ocaml-pcre-devel
 Requires:      ocaml-pcre
-BuildRoot:     %{_tmppath}/%{name}-%{version}-root
 
 %description
 Ocaml-duppy is an advanced scheduler for Ocaml programmers.
@@ -32,26 +34,19 @@ Requires:      %{name} = %{?epoch:%epoch:}%{version}-%{release}
 %description devel
 This package contains libraries and signature files for developing applications that use %{name}.
 
+%debug_package
+
 %prep
 %setup -q
 
 %build
-./configure \
-   --prefix=%{_prefix} \
-   -disable-ldconf
-
-%make all
+dune build
 
 %install
 [ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
-export DESTDIR=%{buildroot}
-export OCAMLFIND_DESTDIR=%{buildroot}$(ocamlfind printconf destdir)
-export DLLDIR=$OCAMLFIND_DESTDIR/stublibs
+DESTDIR="%{buildroot}" dune install --prefix "/usr" --libdir "%{_lib}/ocaml"
 
-install -d $OCAMLFIND_DESTDIR/%{ocamlpck}
-install -d $OCAMLFIND_DESTDIR/stublibs
-
-make install
+rm -rf %{buildroot}/usr/doc
 
 %clean
 [ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
@@ -59,11 +54,12 @@ make install
 %files
 %defattr(-,root,root)
 %dir %{_libdir}/ocaml/%{ocamlpck}
-%{_libdir}/ocaml/%{ocamlpck}/META
-%{_libdir}/ocaml/%{ocamlpck}/*.cma
-%{_libdir}/ocaml/%{ocamlpck}/*.cmi
-%{_libdir}/ocaml/%{ocamlpck}/*.cmo
-%{_libdir}/ocaml/stublibs/*.so*
+%{_libdir}/ocaml/%{ocamlpck}/*
+%exclude %{_libdir}/ocaml/%{ocamlpck}/*.a
+%exclude %{_libdir}/ocaml/%{ocamlpck}/*.cmxa
+%exclude %{_libdir}/ocaml/%{ocamlpck}/*.cmx
+%exclude %{_libdir}/ocaml/%{ocamlpck}/*.mli
+%{_libdir}/ocaml/stublibs/dllduppy_stubs.so
 %doc COPYING
 
 %files devel
@@ -72,10 +68,13 @@ make install
 %{_libdir}/ocaml/%{ocamlpck}/*.cmxa
 %{_libdir}/ocaml/%{ocamlpck}/*.cmx
 %{_libdir}/ocaml/%{ocamlpck}/*.mli
-%doc CHANGES README
+%doc CHANGES README.md
 %doc examples/
 
 %changelog
+* Fri Feb 19 2021 Silvan Calarco <silvan.calarco@mambasoft.it> 0.9.0-1mamba
+- update to 0.9.0
+
 * Sun Jun 23 2013 Davide Madrisan <davide.madrisan@gmail.com> 0.5.1-3mamba
 - install dll libs in stublibs because this directory is known by ocaml ans so we do not need to modify ld.conf