diff --git a/reference/sharpen b/reference/sharpen
index ee88c0a13..186a1f570 160000
--- a/reference/sharpen
+++ b/reference/sharpen
@@ -1 +1 @@
-Subproject commit ee88c0a13113436b09009d8f621333e239ac926f
+Subproject commit 186a1f5709f05b92b367e96f40db80cdcb082ac6