diff --git a/openlane/soc/config.json b/openlane/soc/config.json
index 3af447a..8098aa2 100644
--- a/openlane/soc/config.json
+++ b/openlane/soc/config.json
@@ -80,6 +80,7 @@
     "MAX_TRANSITION_CONSTRAINT": 1.0,
     "MAX_FANOUT_CONSTRAINT": 16,
     "PL_TARGET_DENSITY": 0.55,
+	"GRT_OVERFLOW_ITERS": 500,
     "PL_RESIZER_SETUP_SLACK_MARGIN": 0.4,
     "GLB_RESIZER_SETUP_SLACK_MARGIN": 0.2,
     "GLB_RESIZER_HOLD_SLACK_MARGIN": 0.2,
@@ -89,8 +90,8 @@
     "RUN_HEURISTIC_DIODE_INSERTION": 1,
     "HEURISTIC_ANTENNA_THRESHOLD": 110,    
     "GRT_REPAIR_ANTENNAS": 1,
-	"GRT_MAX_DIODE_INS_ITERS": 100,
-	"GRT_ANT_ITERS": 100,
+	"GRT_MAX_DIODE_INS_ITERS": 500,
+	"GRT_ANT_ITERS": 500,
     "VDD_NETS": [
         "vccd1"
     ],