diff --git a/lib/pkp b/lib/pkp
index 1f9b3118358..877e9ee1d79 160000
--- a/lib/pkp
+++ b/lib/pkp
@@ -1 +1 @@
-Subproject commit 1f9b311835859ce09760ebcdb0c8db988b9467b8
+Subproject commit 877e9ee1d7970e1023e32eb8ece38aaf004cb1a9