diff --git a/lib/pkp b/lib/pkp
index 280ec50dbc..4aaf18587f 160000
--- a/lib/pkp
+++ b/lib/pkp
@@ -1 +1 @@
-Subproject commit 280ec50dbc6d0ee9b4b4efb516515dda834b1b96
+Subproject commit 4aaf18587f774925c36891e0710b1ec6b51ebe15