diff --git a/.gitignore b/.gitignore
index a0f74f1..f8f3e4d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 /labltk-4.02-beta1.tar.gz
 /labltk-8.06.0.tar.gz
 /labltk-8.06.2.tar.gz
+/labltk-8.06.3.tar.gz
diff --git a/ocaml-labltk.spec b/ocaml-labltk.spec
index 77e0cf7..b084563 100644
--- a/ocaml-labltk.spec
+++ b/ocaml-labltk.spec
@@ -5,15 +5,15 @@
 %endif
 
 Name:          ocaml-labltk
-Version:       8.06.2
-Release:       7%{?dist}
+Version:       8.06.3
+Release:       1%{?dist}
 
 Summary:       Tcl/Tk interface for OCaml
 
 License:       LGPLv2+ with exceptions
 
 URL:           https://forge.ocamlcore.org/projects/labltk/
-Source0:       https://forge.ocamlcore.org/frs/download.php/1628/labltk-8.06.2.tar.gz
+Source0:       https://forge.ocamlcore.org/frs/download.php/1701/labltk-8.06.3.tar.gz
 
 # This adds debugging (-g) everywhere.
 Patch1:        labltk-8.06.0-enable-debugging.patch
@@ -106,7 +106,8 @@ install -m 0644 camltk/*.o $RPM_BUILD_ROOT%{_libdir}/ocaml/labltk
 
 
 %changelog
-* Mon Aug 07 2017 Richard W.M. Jones <rjones@redhat.com> - 8.06.2-7
+* Mon Aug 07 2017 Richard W.M. Jones <rjones@redhat.com> - 8.06.3-1
+- New upstream version 8.06.3 (including fixes for OCaml 4.05).
 - OCaml 4.05.0 rebuild.
 
 * Thu Aug 03 2017 Fedora Release Engineering <releng@fedoraproject.org> - 8.06.2-6
diff --git a/sources b/sources
index a05156f..3a25d31 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-15020ef74baa688536ce1d38525462f8  labltk-8.06.2.tar.gz
+SHA512 (labltk-8.06.3.tar.gz) = c2002d519c1fcfdd2b13ae6d5836880273dac2660f07f6ee0e7bb932e3fec6f5cc959202efdf712758a17d24dbe50c3f6697c7b125e3123fa8153130d7ece979