diff --git a/Makefile b/Makefile
index dfb5cfb81..4b84b48df 100644
--- a/Makefile
+++ b/Makefile
@@ -175,7 +175,7 @@ ifeq ($(OS), Haiku)
 CXXFLAGS += -D_DEFAULT_SOURCE
 endif
 
-YOSYS_VER := 0.56+165
+YOSYS_VER := 0.56+171
 YOSYS_MAJOR := $(shell echo $(YOSYS_VER) | cut -d'.' -f1)
 YOSYS_MINOR := $(shell echo $(YOSYS_VER) | cut -d'.' -f2)
 YOSYS_COMMIT := $(shell echo $(YOSYS_VER) | cut -d'.' -f3)