diff --git a/ocaml-faad.spec b/ocaml-faad.spec
index 272998c..a8540cd 100644
--- a/ocaml-faad.spec
+++ b/ocaml-faad.spec
@@ -1,27 +1,25 @@
 %define ocamlpck  faad
 
 Name:          ocaml-faad
-Version:       0.4.0
+Version:       0.5.0
 Release:       1mamba
 Summary:       OCaml bindings for the libfaad AAC decoder library
 Group:         Development/Bindings
 Vendor:        openmamba
 Distribution:  openmamba
-Packager:      Davide Madrisan <davide.madrisan@gmail.com>
-URL:           https://savonet.sourceforge.net/
-Source:        https://github.com/savonet/ocaml-faad.git/%{version}/ocaml-faad-%{version}.tar.bz2
-#Source:        http://sourceforge.net/projects/savonet/files/ocaml-faad/%{version}/ocaml-faad-%{version}.tar.gz
+Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
+URL:           https://github.com/savonet/ocaml-faad
+Source:        https://github.com/savonet/ocaml-faad.git/v%{version}/ocaml-faad-%{version}.tar.bz2
 License:       GPL
 ## AUTOBUILDREQ-BEGIN
 BuildRequires: glibc-devel
-BuildRequires: ldconfig
 BuildRequires: libfaad2-devel
-BuildRequires: ocaml-runtime
+BuildRequires: ocaml
 ## AUTOBUILDREQ-END
+BuildRequires: dune
 BuildRequires: ocaml
 BuildRequires: ocaml-findlib
 BuildRequires: camlidl
-BuildRoot:     %{_tmppath}/%{name}-%{version}-root
 
 %description
 This package contains an O'Caml interface for the AAC audio decoder, otherwise known as libfaad.
@@ -38,26 +36,15 @@ This package contains libraries and signature files for developing applications
 
 %prep
 %setup -q
-./bootstrap
 
 %build
-./configure \
-   --prefix=%{_prefix} \
-   --disable-ldconf
-
-make
-make doc
+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}"
@@ -65,9 +52,11 @@ 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}/*
+%exclude %{_libdir}/ocaml/%{ocamlpck}/*.a
+%exclude %{_libdir}/ocaml/%{ocamlpck}/*.cmxa
+%exclude %{_libdir}/ocaml/%{ocamlpck}/*.cmx
+%exclude %{_libdir}/ocaml/%{ocamlpck}/*.mli
 %{_libdir}/ocaml/stublibs/*.so*
 %doc COPYING
 
@@ -77,10 +66,12 @@ make install
 %{_libdir}/ocaml/%{ocamlpck}/*.cmxa
 %{_libdir}/ocaml/%{ocamlpck}/*.cmx
 %{_libdir}/ocaml/%{ocamlpck}/*.mli
-%doc CHANGES README
-%doc doc/html/
+%doc CHANGES README.md
 
 %changelog
+* Sat Jan 29 2022 Silvan Calarco <silvan.calarco@mambasoft.it> 0.5.0-1mamba
+- update to 0.5.0
+
 * Fri Feb 19 2021 Silvan Calarco <silvan.calarco@mambasoft.it> 0.4.0-1mamba
 - update to 0.5.0