diff --git a/StanHeaders/inst/include/upstream b/StanHeaders/inst/include/upstream
index 51dbaa4a4..904855507 160000
--- a/StanHeaders/inst/include/upstream
+++ b/StanHeaders/inst/include/upstream
@@ -1 +1 @@
-Subproject commit 51dbaa4a4aa5b8d1605b3bbee43f31e297546fbf
+Subproject commit 9048555070493679287a25086e7b85b72ad9531f