diff --git a/_service b/_service
index d81af4a..3c8a805 100644
--- a/_service
+++ b/_service
@@ -1,7 +1,7 @@
 <services>
   <service name="tar_scm" mode="disabled">
     <param name="filename">ocaml-csexp</param>
-    <param name="revision">7eeb86206819d2b1782d6cde1be9d6cf8b5fc851</param>
+    <param name="revision">e6c4768e10c61bcb04d09748744dad55602149c6</param>
     <param name="scm">git</param>
     <param name="submodules">disable</param>
     <param name="url">https://github.com/ocaml-dune/csexp.git</param>
diff --git a/ocaml-csexp-1.5.1.tar.xz b/ocaml-csexp-1.5.1.tar.xz
deleted file mode 100644
index 257a04d..0000000
--- a/ocaml-csexp-1.5.1.tar.xz
+++ /dev/null
@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:d79a4af9a0e70dd5b6630453d6615267e6e0ebde3eba471ac0385630b1e90f82
-size 10204
diff --git a/ocaml-csexp-1.5.2.tar.xz b/ocaml-csexp-1.5.2.tar.xz
new file mode 100644
index 0000000..83f9681
--- /dev/null
+++ b/ocaml-csexp-1.5.2.tar.xz
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:36840ad29839074cc21a7f42a1a939f286e1b09ab71d2c0881990e0b309ec242
+size 11152
diff --git a/ocaml-csexp.changes b/ocaml-csexp.changes
index f71161c..235df80 100644
--- a/ocaml-csexp.changes
+++ b/ocaml-csexp.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Fri May  5 05:05:05 UTC 2023 - ohering@suse.de
+
+- Update to version 1.5.2
+  fix: serialized length
+
 -------------------------------------------------------------------
 Sat Apr  9 12:34:56 UTC 2022 - ohering@suse.de
 
diff --git a/ocaml-csexp.spec b/ocaml-csexp.spec
index ab95bed..8b83fd5 100644
--- a/ocaml-csexp.spec
+++ b/ocaml-csexp.spec
@@ -1,7 +1,7 @@
 #
 # spec file for package ocaml-csexp
 #
-# Copyright (c) 2022 SUSE LLC
+# Copyright (c) 2023 SUSE LLC
 #
 # All modifications and additions to the file contributed by third parties
 # remain the property of their copyright owners, unless otherwise agreed
@@ -29,7 +29,7 @@ ExclusiveArch:  do-not-build
 
 %define     pkg ocaml-csexp
 Name:           %pkg%nsuffix
-Version:        1.5.1
+Version:        1.5.2
 Release:        0
 %{?ocaml_preserve_bytecode}
 Summary:        Parsing and printing of S-expressions in Canonical form
@@ -39,8 +39,8 @@ BuildRoot:      %_tmppath/%name-%version-build
 URL:            https://opam.ocaml.org/packages/csexp
 Source0:        %pkg-%version.tar.xz
 BuildRequires:  ocaml
-BuildRequires:  ocaml-dune
-BuildRequires:  ocaml-rpm-macros >= 20220409
+BuildRequires:  ocaml-dune >= 3.4
+BuildRequires:  ocaml-rpm-macros >= 20230101
 
 %if "%build_flavor" == "testsuite"
 BuildRequires:  ocamlfind(csexp)