diff --git a/ocaml-base64.spec b/ocaml-base64.spec
index 034109e..4f01eba 100644
--- a/ocaml-base64.spec
+++ b/ocaml-base64.spec
@@ -4,7 +4,7 @@
 
 Name:           ocaml-base64
 Version:        3.4.0
-Release:        3%{?dist}
+Release:        4%{?dist}
 Summary:        Base64 library for OCaml
 
 License:        ISC
@@ -81,6 +81,9 @@ find %{buildroot}%{_libdir}/ocaml -name \*.cmxs -exec chmod a+x {} \+
 
 
 %changelog
+* Mon Mar  1 16:57:53 GMT 2021 Richard W.M. Jones <rjones@redhat.com> - 3.4.0-4
+- OCaml 4.12.0 build
+
 * Tue Jan 26 2021 Fedora Release Engineering <releng@fedoraproject.org> - 3.4.0-3
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_34_Mass_Rebuild