diff --git a/lib/pkp b/lib/pkp
index 86d9fe1cdc..4c85bd38b2 160000
--- a/lib/pkp
+++ b/lib/pkp
@@ -1 +1 @@
-Subproject commit 86d9fe1cdc851a2518c813092d0c887529e51f59
+Subproject commit 4c85bd38b2581fcd09b6dd9bca0a3852417ad86d