diff --git a/ocaml-labltk.spec b/ocaml-labltk.spec
index 450c9d8..dfe82cc 100644
--- a/ocaml-labltk.spec
+++ b/ocaml-labltk.spec
@@ -1,23 +1,22 @@
 Name:          ocaml-labltk
-Version:       8.06.9
+Version:       8.06.12
 Release:       1mamba
 Summary:       An OCaml interface to the Tcl/Tk GUI framework
 Group:         System/Libraries
 Vendor:        openmamba
 Distribution:  openmamba
 Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
-URL:           http://labltk.forge.ocamlcore.org/
+URL:           https://github.com/garrigue/labltk
 Source:        https://github.com/garrigue/labltk.git/%{version}/labltk-%{version}.tar.bz2
 License:       BSD
 ## AUTOBUILDREQ-BEGIN
 BuildRequires: glibc-devel
-BuildRequires: ldconfig
 BuildRequires: libtcl-devel
 BuildRequires: libtk-devel
+BuildRequires: ocaml
 BuildRequires: ocaml-runtime
 ## AUTOBUILDREQ-END
-BuildRequires: ocaml >= 4.11.1
-BuildRoot:     %{_tmppath}/%{name}-%{version}-root
+BuildRequires: ocaml >= 4.14.1
 
 %description
 LablTk is an OCaml interface to the Tcl/Tk GUI framework.
@@ -49,6 +48,7 @@ make \
    BINDIR=%{buildroot}%{_bindir} \
    INSTALLDIR=%{buildroot}%{_libdir}/ocaml/labltk \
    STUBLIBDIR=%{buildroot}%{_libdir}/ocaml/stublibs \
+   RANLIB=ranlib \
    install
 
 rm -f %{buildroot}%{_libdir}/ocaml/labltk/*.ml
@@ -86,6 +86,12 @@ rm -f %{buildroot}%{_libdir}/ocaml/labltk/*.ml
 %doc README.md README.mlTk
 
 %changelog
+* Thu Jul 06 2023 Silvan Calarco <silvan.calarco@mambasoft.it> 8.06.12-1mamba
+- update to 8.06.12
+
+* Sun Jul 02 2023 Sdk Build System <sdk@mambasoft.it> 8.06.9-2mamba
+- rebuilt with ocaml 4.14.1
+
 * Thu Jan 21 2021 Silvan Calarco <silvan.calarco@mambasoft.it> 8.06.9-1mamba
 - update to 8.06.9