diff --git a/ocaml-posix.spec b/ocaml-posix.spec
index f5f7a20..77e5796 100644
--- a/ocaml-posix.spec
+++ b/ocaml-posix.spec
@@ -2,7 +2,7 @@
 
 Name:          ocaml-posix
 Version:       2.0.0
-Release:       1mamba
+Release:       2mamba
 Summary:       Bindings to the various POSIX APIs
 Group:         System/Libraries/OCaml
 Vendor:        openmamba
@@ -14,6 +14,7 @@ License:       MIT
 ## AUTOBUILDREQ-BEGIN
 BuildRequires: glibc-devel
 BuildRequires: ocaml
+BuildRequires: ocaml-bigarray-compat-devel
 BuildRequires: ocaml-ctypes-devel
 BuildRequires: ocaml-integers
 BuildRequires: ocaml-result
@@ -23,6 +24,8 @@ BuildRequires: dune
 BuildRequires: ocaml
 BuildRequires: ocaml-findlib
 BuildRequires: ocaml-ounit-devel
+BuildRequires: ocaml-ctypes-devel >= 0.20.0-2mamba
+BuildRequires: ocaml-unix-errno-devel >= 0.6.1-2mamba
 
 %description
 %{summary}.
@@ -72,5 +75,8 @@ rm -rf %{buildroot}/usr/doc
 %doc README.md
 
 %changelog
+* Wed Feb 09 2022 Silvan Calarco <silvan.calarco@mambasoft.it> 2.0.0-2mamba
+- rebuilt with ocaml-ctypes 0.20.0-2mamba
+
 * Sun Feb 06 2022 Silvan Calarco <silvan.calarco@mambasoft.it> 2.0.0-1mamba
 - package created using the webbuild interface