diff --git a/StanHeaders/inst/include/upstream b/StanHeaders/inst/include/upstream
index 6697a24f0..c22f26a5a 160000
--- a/StanHeaders/inst/include/upstream
+++ b/StanHeaders/inst/include/upstream
@@ -1 +1 @@
-Subproject commit 6697a24f0d8c7c74fd29a5aa34c0776dd96c70ce
+Subproject commit c22f26a5addc68fb5aab4e4e454d32649f86fbbd