diff --git a/nbdkit.spec b/nbdkit.spec
index 07365da..0c7eb10 100644
--- a/nbdkit.spec
+++ b/nbdkit.spec
@@ -112,9 +112,7 @@ BuildRequires:  python3-boto3
 %endif
 %if !0%{?rhel}
 %if 0%{?have_ocaml}
-# Requires OCaml 4.02.2 which contains fix for
-# http://caml.inria.fr/mantis/view.php?id=6693
-BuildRequires:  ocaml >= 4.02.2
+BuildRequires:  ocaml >= 4.03
 BuildRequires:  ocaml-ocamldoc
 %endif
 BuildRequires:  ruby-devel
@@ -1187,6 +1185,7 @@ export LIBGUESTFS_TRACE=1
 %changelog
 * Tue Nov 09 2021 Richard W.M. Jones <rjones@redhat.com> - 1.29.5-1
 - New upstream development version 1.29.5
+- New minimum OCaml is 4.03
 
 * Thu Nov 04 2021 Richard W.M. Jones <rjones@redhat.com> - 1.29.4-1
 - New upstream development version 1.29.4