diff --git a/lib/pkp b/lib/pkp
index 55e89edc73..53c1fbcff6 160000
--- a/lib/pkp
+++ b/lib/pkp
@@ -1 +1 @@
-Subproject commit 55e89edc73fef202eb756b05cd0f7b0630b0a53e
+Subproject commit 53c1fbcff6eb70509217a48661d3bf6400bab9b6