diff --git a/StanHeaders/inst/include/upstream b/StanHeaders/inst/include/upstream
index fb24b6428..b667579da 160000
--- a/StanHeaders/inst/include/upstream
+++ b/StanHeaders/inst/include/upstream
@@ -1 +1 @@
-Subproject commit fb24b642879e4e00d176a841bd7485c6417ef93c
+Subproject commit b667579daa3524ed2a1891d2b32f6ce89f0015be