diff --git a/liquidsoap-2.2.0-ocaml-flac-0.4.0.patch b/liquidsoap-2.2.0-ocaml-flac-0.4.0.patch
deleted file mode 100644
index 66fc324..0000000
--- a/liquidsoap-2.2.0-ocaml-flac-0.4.0.patch
+++ /dev/null
@@ -1,48 +0,0 @@
-From 8bb250fe2d2575e2eb8926b491849f47dd68e174 Mon Sep 17 00:00:00 2001
-From: Romain Beauxis <toots@rastageeks.org>
-Date: Tue, 4 Jul 2023 12:04:11 -0500
-Subject: [PATCH] Adapt to new flac decoder API.
-
----
- src/core/decoder/ogg_flac_duration.ml | 4 ++--
- tests/streams/dune                    | 5 +++++
- 2 files changed, 7 insertions(+), 2 deletions(-)
-
-diff --git a/src/core/decoder/ogg_flac_duration.ml b/src/core/decoder/ogg_flac_duration.ml
-index 196456c676..36293a70c4 100644
---- a/src/core/decoder/ogg_flac_duration.ml
-+++ b/src/core/decoder/ogg_flac_duration.ml
-@@ -44,8 +44,8 @@ let duration ~metadata:_ file =
-           let page = Ogg.Sync.read sync in
-           if Ogg.Page.serialno page = serial then Ogg.Stream.put_page os page
-         in
--        let callbacks = Flac_ogg.Decoder.get_callbacks (fun _ -> ()) in
--        let dec = Flac_ogg.Decoder.create packet os in
-+        let callbacks = Flac_ogg.Decoder.get_callbacks os (fun _ -> ()) in
-+        let dec = Flac.Decoder.create callbacks in
-         let rec info () =
-           try Flac.Decoder.init dec callbacks
-           with Ogg.Not_enough_data ->
-diff --git a/tests/streams/dune b/tests/streams/dune
-index 250c9158dc..95b518a68a 100644
---- a/tests/streams/dune
-+++ b/tests/streams/dune
-@@ -173,6 +173,10 @@
- (rule
-  (alias citest)
-  (target playlist)
-+ (deps
-+  ./file1.mp3
-+  ./file2.mp3
-+  ./file3.mp3)
-  (action
-   (with-stdout-to
-    %{target}
-@@ -181,6 +185,7 @@
- (rule
-  (alias citest)
-  (target huge_playlist)
-+ (deps ./file1.mp3)
-  (action
-   (with-stdout-to
-    %{target}
diff --git a/liquidsoap.spec b/liquidsoap.spec
index b4312e9..190ced6 100644
--- a/liquidsoap.spec
+++ b/liquidsoap.spec
@@ -1,7 +1,7 @@
 %define majver %(echo %version | cut -d. -f1-2)
 Name:          liquidsoap
 Version:       2.2.3
-Release:       1mamba
+Release:       2mamba
 Summary:       Audio toolkit for streaming, aiming at complex Internet radio systems
 Group:         Applications/Multimedia
 Vendor:        openmamba
@@ -11,7 +11,6 @@ URL:           https://savonet.sourceforge.net/
 Source0:       https://github.com/savonet/liquidsoap.git/v%{version}/liquidsoap-%{version}.tar.bz2
 Source1:       liquidsoap.service
 Source2:       liquidsoap.tmpfilesd
-Patch0:        liquidsoap-2.2.0-ocaml-flac-0.4.0.patch
 License:       GPL, LGPL
 ## AUTOBUILDREQ-BEGIN
 BuildRequires: dune
@@ -67,6 +66,8 @@ BuildRequires: ocaml-seq-devel
 BuildRequires: ghc-pandoc
 %endif
 BuildRequires: camlidl
+BuildRequires: ocaml-menhir-devel >= 20231231
+BuildRequires: dune >= 3.12.2 
 BuildRequires: ocaml >= 4.00.1
 BuildRequires: ocaml-bjack-devel
 BuildRequires: ocaml-curl-devel
@@ -209,7 +210,6 @@ This package contains documentation in HTML format.
 %setup -q
 #-D -T
 #:<< _EOF
-#%patch 0 -p1 -R -b .ocaml-flac-0.4.0
 
 # Build error with old pandoc
 rm -rf doc
@@ -290,6 +290,9 @@ fi
 %doc COPYING
 
 %changelog
+* Wed Jan 10 2024 Silvan Calarco <silvan.calarco@mambasoft.it> 2.2.3-2mamba
+- rebuilt with dune 3.12.2 and ocaml-menhir-devel 20231231
+
 * Tue Dec 19 2023 Automatic Build System <autodist@mambasoft.it> 2.2.3-1mamba
 - automatic version update by autodist