diff --git a/lib/pkp b/lib/pkp
index d465b5a07b..551f0fdc0f 160000
--- a/lib/pkp
+++ b/lib/pkp
@@ -1 +1 @@
-Subproject commit d465b5a07b444df45f1c16a6477c0c408c2dd48b
+Subproject commit 551f0fdc0ff43fddc4f761c8cb157857e064c636