diff --git a/src/cppgtfs b/src/cppgtfs
index dce9b94..31e2079 160000
--- a/src/cppgtfs
+++ b/src/cppgtfs
@@ -1 +1 @@
-Subproject commit dce9b94bd1e57bce1ba6242708234addc0db1d3c
+Subproject commit 31e2079cdad67e72eb371acce28580da57e962ce