diff --git a/les/costtracker.go b/les/costtracker.go
index 0daa9ba449..c976a10f6e 100644
--- a/les/costtracker.go
+++ b/les/costtracker.go
@@ -88,7 +88,7 @@ const (
 	gfUsageTC        = time.Second
 	gfRaiseTC        = time.Second * 200
 	gfDropTC         = time.Second * 50
-	gfDbKey          = "_globalCostFactorV4"
+	gfDbKey          = "_globalCostFactorV5"
 )
 
 // costTracker is responsible for calculating costs and cost estimates on the