diff --git a/lib/stan_math b/lib/stan_math
index 9bae49db12..42d94c4840 160000
--- a/lib/stan_math
+++ b/lib/stan_math
@@ -1 +1 @@
-Subproject commit 9bae49db12815e6906765788663ff6b6f04769fc
+Subproject commit 42d94c4840f681806ae0e0134120a4077a29e46c