diff --git a/lib/pkp b/lib/pkp
index d1ac98543e1..6ab64277fef 160000
--- a/lib/pkp
+++ b/lib/pkp
@@ -1 +1 @@
-Subproject commit d1ac98543e16f7b0c728d32146b570a5415421a3
+Subproject commit 6ab64277fef99cb9b732bcca468c6f35409991f9