diff --git a/core/taiko_genesis.go b/core/taiko_genesis.go
index ed114eacd2..bc3a2ba4ed 100644
--- a/core/taiko_genesis.go
+++ b/core/taiko_genesis.go
@@ -12,8 +12,7 @@ import (
 var (
 	InternalDevnetOntakeBlock = new(big.Int).SetUint64(2)
 	HeklaOntakeBlock          = new(big.Int).SetUint64(840_512)
-	// TODO: update this value when mainnet fork height is decided
-	MainnetOntakeBlock = new(big.Int).SetUint64(9_000_000)
+	MainnetOntakeBlock        = new(big.Int).SetUint64(538_304)
 )
 
 // TaikoGenesisBlock returns the Taiko network genesis block configs.