diff --git a/lib/pkp b/lib/pkp
index a1caad182db..4e8a5a1cf52 160000
--- a/lib/pkp
+++ b/lib/pkp
@@ -1 +1 @@
-Subproject commit a1caad182db02667ecebe229fb888c8d23423743
+Subproject commit 4e8a5a1cf523f816286343fe103f7eca52b02e70