diff --git a/yosys b/yosys
index 4a475fa7a..6405bbab1 160000
--- a/yosys
+++ b/yosys
@@ -1 +1 @@
-Subproject commit 4a475fa7a2788679b4c575dc3c1231a065d35271
+Subproject commit 6405bbab1e8afc587febf41339aaf8b514c8f202