diff --git a/lib/pkp b/lib/pkp
index 1b2cd5524cb..d9e28929aba 160000
--- a/lib/pkp
+++ b/lib/pkp
@@ -1 +1 @@
-Subproject commit 1b2cd5524cb4acf733295fa7cc4e17cd1bd14c7b
+Subproject commit d9e28929aba111c91ee4cf7d4d5263cafdca55f0