diff --git a/ocaml-srt.spec b/ocaml-srt.spec
index e628c0d..8af8846 100644
--- a/ocaml-srt.spec
+++ b/ocaml-srt.spec
@@ -2,7 +2,7 @@
 
 Name:          ocaml-srt
 Version:       0.2.1
-Release:       2mamba
+Release:       3mamba
 Summary:       OCaml bindings for the Secure, Reliable, Transport protocol library 
 Group:         System/Libraries/OCaml
 Vendor:        openmamba
@@ -22,8 +22,8 @@ BuildRequires: ocaml-posix-devel
 ## AUTOBUILDREQ-END
 BuildRequires: dune
 BuildRequires: ocaml-findlib
-BuildRequires: ocaml-ctypes-devel >= 0.20.0-2mamba
-BuildRequires: ocaml-posix-devel >= 2.0.0-2mamba
+BuildRequires: ocaml-ctypes-devel >= 0.20.1
+BuildRequires: ocaml-posix-devel >= 2.0.0-3mamba
 
 %description
 %{summary}.
@@ -73,6 +73,9 @@ rm -rf %{buildroot}/usr/doc
 %doc CHANGES* README.md
 
 %changelog
+* Sat May 14 2022 Silvan Calarco <silvan.calarco@mambasoft.it> 0.2.1-3mamba
+- rebuilt with ocaml-ctypes 0.20.1
+
 * Wed Feb 09 2022 Silvan Calarco <silvan.calarco@mambasoft.it> 0.2.1-2mamba
 - rebuilt with ocaml-posix 2.0.0-2mamba and ocaml-ctypes 0.20.0-2mamba