diff --git a/tools/yosys b/tools/yosys
index 89f32a415b..863f40978e 160000
--- a/tools/yosys
+++ b/tools/yosys
@@ -1 +1 @@
-Subproject commit 89f32a415b2fcd9fdf08f735fae043fac9e1ab4a
+Subproject commit 863f40978e798f8002bac989a1cb1c755ef1165e