diff --git a/src/png b/src/png
index 46b17e804b..3ffeff7877 160000
--- a/src/png
+++ b/src/png
@@ -1 +1 @@
-Subproject commit 46b17e804bcab3729f69993c8dc2d1f1b15cc780
+Subproject commit 3ffeff7877598d3236cc09a6d3f478073eb33f35