diff --git a/ocaml-labltk.spec b/ocaml-labltk.spec
index b754ca4..6cd3535 100644
--- a/ocaml-labltk.spec
+++ b/ocaml-labltk.spec
@@ -6,7 +6,7 @@
 
 Name:          ocaml-labltk
 Version:       8.06.10
-Release:       3%{?dist}
+Release:       4%{?dist}
 
 Summary:       Tcl/Tk interface for OCaml
 
@@ -117,6 +117,9 @@ install -m 0644 camltk/*.o $RPM_BUILD_ROOT%{_libdir}/ocaml/labltk
 
 
 %changelog
+* Mon Oct 04 2021 Richard W.M. Jones <rjones@redhat.com> - 8.06.10-4
+- OCaml 4.13.1 build
+
 * Thu Jul 22 2021 Fedora Release Engineering <releng@fedoraproject.org> - 8.06.10-3
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_35_Mass_Rebuild