diff --git a/lib/pkp b/lib/pkp
index ed96a30fbb2..b6991140f96 160000
--- a/lib/pkp
+++ b/lib/pkp
@@ -1 +1 @@
-Subproject commit ed96a30fbb2df923ceaaad4e9e3396fc25906c74
+Subproject commit b6991140f962c7fb169c8ddb23e0215a0d9158c5