diff --git a/Makefile b/Makefile
index 17373a1..efe9ded 100644
--- a/Makefile
+++ b/Makefile
@@ -31,7 +31,7 @@
 # PDK switch varient
 export PDK?=sky130B
 
-MPW_TAG ?= mpw-5c
+MPW_TAG ?= test-6a
 
 ifeq ($(CARAVEL_LITE),1)
 	CARAVEL_NAME := caravel-lite