diff --git a/yosys b/yosys
index 77b2ae2e3..4b9f45273 160000
--- a/yosys
+++ b/yosys
@@ -1 +1 @@
-Subproject commit 77b2ae2e3906c2aa5a14fbc4e2239ac3ddd08bfc
+Subproject commit 4b9f4527352cd433db198c72d4f1efc52f52c0a1