diff --git a/Makefile b/Makefile
index aa3663135..62859f97f 100644
--- a/Makefile
+++ b/Makefile
@@ -126,7 +126,7 @@ LDFLAGS += -rdynamic
 LDLIBS += -lrt
 endif
 
-YOSYS_VER := 0.9+4236
+YOSYS_VER := 0.9+4239
 GIT_REV := $(shell git -C $(YOSYS_SRC) rev-parse --short HEAD 2> /dev/null || echo UNKNOWN)
 OBJS = kernel/version_$(GIT_REV).o