Makefile: switch default to gf180mcuC
diff --git a/Makefile b/Makefile
index 9c9af82..61ed5c5 100644
--- a/Makefile
+++ b/Makefile
@@ -24,8 +24,7 @@
 CARAVEL_LITE?=1
 
 # PDK switch varient
-export PDK?=sky130B
-#export PDK?=gf180mcuC
+export PDK?=gf180mcuC
 export PDKPATH?=$(PDK_ROOT)/$(PDK)