diff --git a/lib/pkp b/lib/pkp
index ac9468b8d87..a9a4928d1c9 160000
--- a/lib/pkp
+++ b/lib/pkp
@@ -1 +1 @@
-Subproject commit ac9468b8d876620dfb055d927875065bead5d102
+Subproject commit a9a4928d1c95fe397e5734484af5baa790fa44ff