diff --git a/StanHeaders/inst/include/upstream b/StanHeaders/inst/include/upstream
index ea57252ab..77727a931 160000
--- a/StanHeaders/inst/include/upstream
+++ b/StanHeaders/inst/include/upstream
@@ -1 +1 @@
-Subproject commit ea57252abf6aaa165578ce9fe4680f1a3a79c8ac
+Subproject commit 77727a9315699d4295a68f520098ea3c7d18f032