diff --git a/op-e2e/actions/proofs/isthmus_fork_test.go b/op-e2e/actions/proofs/isthmus_fork_test.go
index f6e426d7f8b18..7b1d21c6e4f68 100644
--- a/op-e2e/actions/proofs/isthmus_fork_test.go
+++ b/op-e2e/actions/proofs/isthmus_fork_test.go
@@ -31,7 +31,7 @@ import (
 )
 
 var (
-	isthmusL1BlockCodeHash          = common.HexToHash("0x8e3fe7a416d3e5f3b7be74ddd4e7e58e516fa3f80b67c6d930e3cd7297da4a4b")
+	isthmusL1BlockCodeHash          = common.HexToHash("0x3df0db3bfa482161b4e815804668f8f293288d5afad3bc20fb699383c145ef26")
 	isthmusGasPriceOracleCodeHash   = common.HexToHash("0x4d195a9d7caf9fb6d4beaf80de252c626c853afd5868c4f4f8d19c9d301c2679")
 	isthmusOperatorFeeVaultCodeHash = common.HexToHash("0x57dc55c9c09ca456fa728f253fe7b895d3e6aae0706104935fe87c7721001971")
 )
diff --git a/op-node/rollup/derive/isthmus_upgrade_transactions.go b/op-node/rollup/derive/isthmus_upgrade_transactions.go
index 25bee50b06191..fc5dc03cb2303 100644
--- a/op-node/rollup/derive/isthmus_upgrade_transactions.go
+++ b/op-node/rollup/derive/isthmus_upgrade_transactions.go
@@ -30,7 +30,8 @@ var (
 	OperatorFeeVaultAddress         = crypto.CreateAddress(OperatorFeeVaultDeployerAddress, 0)
 
 	// Bytecodes
-	l1BlockIsthmusDeploymentBytecode        = common.FromHex("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")
+	// The L1Block contract code had to be altered to support the CustomGasToken feature.
+	l1BlockIsthmusDeploymentBytecode        = common.FromHex("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")
 	gasPriceOracleIsthmusDeploymentBytecode = common.FromHex("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 	operatorFeeVaultDeploymentBytecode      = common.FromHex("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")
 
@@ -52,7 +53,7 @@ func IsthmusNetworkUpgradeTransactions() ([]hexutil.Bytes, error) {
 		To:                  nil,
 		Mint:                big.NewInt(0),
 		Value:               big.NewInt(0),
-		Gas:                 425_000,
+		Gas:                 675_000,
 		IsSystemTransaction: false,
 		Data:                l1BlockIsthmusDeploymentBytecode,
 	}).MarshalBinary()
diff --git a/op-node/rollup/derive/isthmus_upgrade_transactions_test.go b/op-node/rollup/derive/isthmus_upgrade_transactions_test.go
index c005d57b16130..8b222a443cd4f 100644
--- a/op-node/rollup/derive/isthmus_upgrade_transactions_test.go
+++ b/op-node/rollup/derive/isthmus_upgrade_transactions_test.go
@@ -59,7 +59,7 @@ func TestIsthmusNetworkTransactions(t *testing.T) {
 	require.Equal(t, deployL1BlockSender, common.HexToAddress("0x4210000000000000000000000000000000000003"))
 	require.Equal(t, deployIsthmusL1BlockSource.SourceHash(), deployL1Block.SourceHash())
 	require.Nil(t, deployL1Block.To())
-	require.Equal(t, uint64(425_000), deployL1Block.Gas()) // TODO
+	require.Equal(t, uint64(675_000), deployL1Block.Gas()) // TODO
 	require.Equal(t, l1BlockIsthmusDeploymentBytecode, deployL1Block.Data())
 
 	deployGasPriceOracleSender, deployGasPriceOracle := toDepositTxn(t, upgradeTxns[1])