diff --git a/StanHeaders/inst/include/upstream b/StanHeaders/inst/include/upstream
index 2df2382a0..98a6b5592 160000
--- a/StanHeaders/inst/include/upstream
+++ b/StanHeaders/inst/include/upstream
@@ -1 +1 @@
-Subproject commit 2df2382a07310ca57b5e5d12d4921f9eff69d66a
+Subproject commit 98a6b5592e0268c8cbed914050ef93e55b55d517