diff --git a/ocaml-calendar.spec b/ocaml-calendar.spec
index 3b678ec..c71934b 100644
--- a/ocaml-calendar.spec
+++ b/ocaml-calendar.spec
@@ -16,7 +16,7 @@ ExcludeArch: %{ix86}
 
 Name:           ocaml-calendar
 Version:        3.0.0
-Release:        3%{?dist}
+Release:        4%{?dist}
 Summary:        Objective Caml library for managing dates and times
 License:        LGPL-2.1-or-later WITH OCaml-LGPL-linking-exception
 
@@ -75,6 +75,9 @@ developing applications that use %{name}.
 
 
 %changelog
+* Thu Oct 05 2023 Richard W.M. Jones <rjones@redhat.com> - 3.0.0-4
+- OCaml 5.1 rebuild for Fedora 40
+
 * Thu Jul 20 2023 Fedora Release Engineering <releng@fedoraproject.org> - 3.0.0-3
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild