diff --git a/lib/pkp b/lib/pkp
index b8d985fb8ba..9ba4db5f58f 160000
--- a/lib/pkp
+++ b/lib/pkp
@@ -1 +1 @@
-Subproject commit b8d985fb8baebe981935ba2175616c6fd1a923b8
+Subproject commit 9ba4db5f58f988237abd380eb4f50484b50a82f5