diff --git a/StanHeaders/inst/include/upstream b/StanHeaders/inst/include/upstream
index 77727a931..1bbf73552 160000
--- a/StanHeaders/inst/include/upstream
+++ b/StanHeaders/inst/include/upstream
@@ -1 +1 @@
-Subproject commit 77727a9315699d4295a68f520098ea3c7d18f032
+Subproject commit 1bbf73552306aae70842aeab97b44a7b2ecdca37