diff --git a/ocaml-dune.spec b/ocaml-dune.spec
index eafccda..7ba620a 100644
--- a/ocaml-dune.spec
+++ b/ocaml-dune.spec
@@ -9,7 +9,7 @@
 
 Name:           ocaml-dune
 Version:        3.9.1
-Release:        3%{?dist}
+Release:        4%{?dist}
 Summary:        Composable build system for OCaml and Reason
 
 # Dune itself is MIT.  Some bundled libraries have a different license:
@@ -567,6 +567,9 @@ cd -
 %files -n ocaml-xdg-devel -f .ofiles-xdg-devel
 
 %changelog
+* Thu Jul 20 2023 Fedora Release Engineering <releng@fedoraproject.org> - 3.9.1-4
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild
+
 * Tue Jul 11 2023 Richard W.M. Jones <rjones@redhat.com> - 3.9.1-3
 - OCaml 5.0 rebuild for Fedora 39
 - ExcludeArch i686