diff --git a/src/png b/src/png
index 772e393c7e..5668fc8fd6 160000
--- a/src/png
+++ b/src/png
@@ -1 +1 @@
-Subproject commit 772e393c7eb95f0424d2d895abd5f8ad0131f500
+Subproject commit 5668fc8fd6cceb79cfd8dd3cdec24a4f998cfcea