diff --git a/lib/pkp b/lib/pkp
index 5370731229..c4cf339161 160000
--- a/lib/pkp
+++ b/lib/pkp
@@ -1 +1 @@
-Subproject commit 53707312295f35cfee662659c4572f0570882ed4
+Subproject commit c4cf339161765e79c314884423b6ae5ff6e80a9d