diff --git a/tools/yosys b/tools/yosys
index 77005b69a..9ed031ddd 160000
--- a/tools/yosys
+++ b/tools/yosys
@@ -1 +1 @@
-Subproject commit 77005b69a2f693425294dab62c49164edb15bf10
+Subproject commit 9ed031ddd588442f22be13ce608547a5809b62f0