diff --git a/lib/pkp b/lib/pkp
index ffea90b480..bb9bff87af 160000
--- a/lib/pkp
+++ b/lib/pkp
@@ -1 +1 @@
-Subproject commit ffea90b4800dbd708f904e9420820f3743242e4a
+Subproject commit bb9bff87afa38b57f8d77cb2c2a79c08833fdc20