diff --git a/ocaml-lwt.spec b/ocaml-lwt.spec
index 6fd74c7..3f508b9 100644
--- a/ocaml-lwt.spec
+++ b/ocaml-lwt.spec
@@ -2,7 +2,7 @@
 
 Name:          ocaml-lwt
 Version:       5.5.0
-Release:       5mamba
+Release:       6mamba
 Summary:       OCaml promises and concurrent I/O
 Group:         System/Libraries/OCaml
 Vendor:        openmamba
@@ -30,14 +30,15 @@ BuildRequires: ocaml-seq-devel
 BuildRequires: ocaml-sexplib0-devel
 ## AUTOBUILDREQ-END
 BuildRequires: ocaml-sexplib0-devel >= 0:0.15.1-1mamba
-BuildRequires: ocaml
-BuildRequires: ocaml-camlp4-devel
-BuildRequires: ocaml-findlib
 BuildRequires: ocaml-ctypes-devel >= 0.20.0-2mamba
 BuildRequires: ocaml-luv-devel >= 0.5.11-3mamba
 BuildRequires: ocaml-mmap-devel >= 1.2.0
 BuildRequires: ocaml-react-devel >= 1.2.2
+BuildRequires: ocaml-ppxlib-devel >= 0.29.1
 BuildRequires: dune
+BuildRequires: ocaml
+BuildRequires: ocaml-camlp4-devel
+BuildRequires: ocaml-findlib
 
 %description
 OCaml promises and concurrent I/O.
@@ -93,6 +94,9 @@ rm -rf %{buildroot}/usr/doc
 %doc CHANGES README.md
 
 %changelog
+* Sun Mar 19 2023 Silvan Calarco <silvan.calarco@mambasoft.it> 5.5.0-6mamba
+- rebuilt with ocaml-ppxlib 0.29.1
+
 * Sat Jun 25 2022 Silvan Calarco <silvan.calarco@mambasoft.it> 5.5.0-5mamba
 - rebuilt by autoport with build requirements: ocaml-sexplib0-devel>=0:0.15.1-1mamba--buildreqocaml-sexplib0-devel>=0:0.15.1-1mamba