diff --git a/ocaml-unix-errno.spec b/ocaml-unix-errno.spec
index cb18fb7..aa285e8 100644
--- a/ocaml-unix-errno.spec
+++ b/ocaml-unix-errno.spec
@@ -1,7 +1,7 @@
 %define ocamlpck  unix-errno
 Name:          ocaml-unix-errno
 Version:       0.6.1
-Release:       2mamba
+Release:       3mamba
 Summary:       Unix errno types, maps, and support for OCaml
 Group:         System/Libraries/OCaml
 Vendor:        openmamba
@@ -18,7 +18,7 @@ BuildRequires: ocaml-ctypes-devel
 BuildRequires: ocaml-integers
 BuildRequires: ocaml-result
 ## AUTOBUILDREQ-END
-BuildRequires: ocaml-ctypes-devel >= 0.20.0-2mamba
+BuildRequires: ocaml-ctypes-devel >= 0.20.1
 BuildRequires: dune
 
 %description
@@ -72,6 +72,9 @@ rm -rf %{buildroot}/usr/doc
 
 
 %changelog
+* Sat May 14 2022 Silvan Calarco <silvan.calarco@mambasoft.it> 0.6.1-3mamba
+- rebuilt with ocaml-ctypes 0.20.1
+
 * Wed Feb 09 2022 Silvan Calarco <silvan.calarco@mambasoft.it> 0.6.1-2mamba
 - rebuilt with ocaml-ctypes-devel 0.20.0-2mamba