diff --git a/src/config.json b/src/config.json
index 3fc2ed63..c85df12a 100644
--- a/src/config.json
+++ b/src/config.json
@@ -60,14 +60,9 @@
 
   "FP_PDN_VPITCH": 38.87,
 
-  "//": "Use alternative efabless decap cells to solve LI density issue",
-  "DECAP_CELL": [
-    "sky130_fd_sc_hd__decap_3",
-    "sky130_fd_sc_hd__decap_4",
-    "sky130_fd_sc_hd__decap_6",
-    "sky130_fd_sc_hd__decap_8",
-    "sky130_ef_sc_hd__decap_12"
-  ],
+  "//": "Use specific decap and fill cells to solve LI/POLY density issues",
+  "DECAP_CELL": ["sky130_fd_sc_hd__decap_3"],
+  "FILL_CELL": ["sky130_fd_sc_hd__fill_2", "sky130_fd_sc_hd__fill_1"],
 
   "//": "Clock",
   "RUN_CTS": 1,