diff --git a/.gitignore b/.gitignore
index f8f3e4d..21f0326 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@
 /labltk-8.06.0.tar.gz
 /labltk-8.06.2.tar.gz
 /labltk-8.06.3.tar.gz
+/labltk-8.06.4.tar.gz
diff --git a/ocaml-labltk.spec b/ocaml-labltk.spec
index b084563..36f0f3f 100644
--- a/ocaml-labltk.spec
+++ b/ocaml-labltk.spec
@@ -5,7 +5,7 @@
 %endif
 
 Name:          ocaml-labltk
-Version:       8.06.3
+Version:       8.06.4
 Release:       1%{?dist}
 
 Summary:       Tcl/Tk interface for OCaml
@@ -13,7 +13,7 @@ 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/1701/labltk-8.06.3.tar.gz
+Source0:       https://forge.ocamlcore.org/frs/download.php/1727/labltk-8.06.4.tar.gz
 
 # This adds debugging (-g) everywhere.
 Patch1:        labltk-8.06.0-enable-debugging.patch
@@ -106,6 +106,9 @@ install -m 0644 camltk/*.o $RPM_BUILD_ROOT%{_libdir}/ocaml/labltk
 
 
 %changelog
+* Tue Nov 07 2017 Richard W.M. Jones <rjones@redhat.com> - 8.06.4-1
+- New upstream version 8.06.4.
+
 * 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.
diff --git a/sources b/sources
index 3a25d31..15f40c2 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (labltk-8.06.3.tar.gz) = c2002d519c1fcfdd2b13ae6d5836880273dac2660f07f6ee0e7bb932e3fec6f5cc959202efdf712758a17d24dbe50c3f6697c7b125e3123fa8153130d7ece979
+SHA512 (labltk-8.06.4.tar.gz) = 5221d2378f73cbcc2a4abd003023c01c8f0e1a919029ddb06069db30284b0bdef12e03b66b9c7c694c7a2128b060f2f2a5a34e4f3b8eed1060a0880a2e429644