diff --git a/ocaml-lwt.spec b/ocaml-lwt.spec
index 190916e..7f27077 100644
--- a/ocaml-lwt.spec
+++ b/ocaml-lwt.spec
@@ -2,18 +2,19 @@
 
 Name:          ocaml-lwt
 Version:       5.5.0
-Release:       1mamba
+Release:       2mamba
 Summary:       OCaml promises and concurrent I/O
 Group:         System/Libraries/OCaml
 Vendor:        openmamba
 Distribution:  openmamba
 Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
-URL:           https://ocsigen.org/lwt
+URL:           https://ocsigen.org/lwt/
 Source:        https://github.com/ocsigen/lwt.git/%{version}/lwt-%{version}.tar.bz2
 License:       MIT
 ## AUTOBUILDREQ-BEGIN
 BuildRequires: glibc-devel
 BuildRequires: ocaml
+BuildRequires: ocaml-bigarray-compat-devel
 BuildRequires: ocaml-compiler-libs
 BuildRequires: ocaml-compiler-libs-repackaged
 BuildRequires: ocaml-ctypes-devel
@@ -31,6 +32,8 @@ BuildRequires: ocaml-sexplib0-devel
 BuildRequires: ocaml
 BuildRequires: ocaml-camlp4-devel
 BuildRequires: ocaml-findlib
+BuildRequires: ocaml-ctypes-devel >= 0.20.0-2mamba
+BuildRequires: ocaml-luv-devel >= 0.5.11-2mamba
 BuildRequires: dune
 
 %description
@@ -87,5 +90,8 @@ rm -rf %{buildroot}/usr/doc
 %doc CHANGES README.md
 
 %changelog
+* Wed Feb 09 2022 Silvan Calarco <silvan.calarco@mambasoft.it> 5.5.0-2mamba
+- rebuilt with ocaml-ctypes 0.20.0-2mamba
+
 * Sun Jan 30 2022 Silvan Calarco <silvan.calarco@mambasoft.it> 5.5.0-1mamba
 - package created using the webbuild interface