diff --git a/lib/pkp b/lib/pkp
index 99ab07a5ce..f31c826ea9 160000
--- a/lib/pkp
+++ b/lib/pkp
@@ -1 +1 @@
-Subproject commit 99ab07a5ce5207465817f65cfb88cd578dde7915
+Subproject commit f31c826ea97c8778f8cbee846b81a64abe819382