diff --git a/ocaml-integers.spec b/ocaml-integers.spec
index 7c3b6d9..a77d646 100644
--- a/ocaml-integers.spec
+++ b/ocaml-integers.spec
@@ -1,6 +1,6 @@
 Name:          ocaml-integers
 Version:       0.2.2
-Release:       1mamba
+Release:       2mamba
 Summary:       Various signed and unsigned integer types for OCaml
 Group:         System/Libraries/OCaml
 Vendor:        openmamba
@@ -14,7 +14,9 @@ License:       MIT
 BuildRequires: glibc-devel
 ## AUTOBUILDREQ-END
 BuildRequires: dune
-BuildRequires: ocaml
+BuildRequires: ocaml >= 4.09.0-4mamba
+BuildRequires: ocaml-findlib-devel >= 1.8.1-3mamba
+BuildRequires: ocamlbuild >= 0.14.0-3mamba
 BuildRequires: opam
 BuildRequires: ocaml-topkg
 BuildRoot:     %{_tmppath}/%{name}-%{version}-root
@@ -49,5 +51,8 @@ opam-installer \
 %doc LICENSE.md
 
 %changelog
+* Mon Dec 30 2019 Silvan Calarco <silvan.calarco@mambasoft.it> 0.2.2-2mamba
+- rebuilt with ocaml 4.09.0-4mamba
+
 * Sun May 05 2019 Silvan Calarco <silvan.calarco@mambasoft.it> 0.2.2-1mamba
 - package created using the webbuild interface