diff --git a/contracts/src/L1/gateways/IL1GatewayRouter.sol b/contracts/src/L1/gateways/IL1GatewayRouter.sol
index f6a6115275..b2d253c43a 100644
--- a/contracts/src/L1/gateways/IL1GatewayRouter.sol
+++ b/contracts/src/L1/gateways/IL1GatewayRouter.sol
@@ -10,11 +10,6 @@ interface IL1GatewayRouter is IL1ETHGateway, IL1ERC20Gateway {
      * Events *
      **********/
 
-    /// @notice Emitted when the address of ETH Gateway is updated.
-    /// @param oldETHGateway The address of the old ETH Gateway.
-    /// @param newEthGateway The address of the new ETH Gateway.
-    event SetETHGateway(address indexed oldETHGateway, address indexed newEthGateway);
-
     /// @notice Emitted when the address of default ERC20 Gateway is updated.
     /// @param oldDefaultERC20Gateway The address of the old default ERC20 Gateway.
     /// @param newDefaultERC20Gateway The address of the new default ERC20 Gateway.
@@ -26,6 +21,13 @@ interface IL1GatewayRouter is IL1ETHGateway, IL1ERC20Gateway {
     /// @param newGateway The corresponding address of the new gateway.
     event SetERC20Gateway(address indexed token, address indexed oldGateway, address indexed newGateway);
 
+    /**********
+     * Errors *
+     **********/
+
+    /// @dev Thrown when the given address is `address(0)`.
+    error ErrorZeroAddress();
+
     /*************************
      * Public View Functions *
      *************************/
@@ -52,11 +54,6 @@ interface IL1GatewayRouter is IL1ETHGateway, IL1ERC20Gateway {
      * Restricted Functions *
      ************************/
 
-    /// @notice Update the address of ETH gateway contract.
-    /// @dev This function should only be called by contract owner.
-    /// @param _ethGateway The address to update.
-    function setETHGateway(address _ethGateway) external;
-
     /// @notice Update the address of default ERC20 gateway contract.
     /// @dev This function should only be called by contract owner.
     /// @param _defaultERC20Gateway The address to update.
diff --git a/contracts/src/L1/gateways/L1GatewayRouter.sol b/contracts/src/L1/gateways/L1GatewayRouter.sol
index f0d8cf99e8..3316c7ec87 100644
--- a/contracts/src/L1/gateways/L1GatewayRouter.sol
+++ b/contracts/src/L1/gateways/L1GatewayRouter.sol
@@ -19,13 +19,6 @@ import {IL1GatewayRouter} from "./IL1GatewayRouter.sol";
 contract L1GatewayRouter is OwnableUpgradeable, IL1GatewayRouter {
     using SafeERC20Upgradeable for IERC20Upgradeable;
 
-    /**********
-     * Errors *
-     **********/
-
-    /// @dev Thrown when the given address is `address(0)`.
-    error ErrorZeroAddress();
-
     /*************
      * Constants *
      *************/
@@ -244,14 +237,6 @@ contract L1GatewayRouter is OwnableUpgradeable, IL1GatewayRouter {
      * Restricted Functions *
      ************************/
 
-    /// @inheritdoc IL1GatewayRouter
-    function setETHGateway(address _newEthGateway) external onlyOwner {
-        address _oldETHGateway = ethGateway;
-        ethGateway = _newEthGateway;
-
-        emit SetETHGateway(_oldETHGateway, _newEthGateway);
-    }
-
     /// @inheritdoc IL1GatewayRouter
     function setDefaultERC20Gateway(address _newDefaultERC20Gateway) external onlyOwner {
         address _oldDefaultERC20Gateway = defaultERC20Gateway;
diff --git a/contracts/src/L2/gateways/IL2GatewayRouter.sol b/contracts/src/L2/gateways/IL2GatewayRouter.sol
index 1091989542..7e81f86dfd 100644
--- a/contracts/src/L2/gateways/IL2GatewayRouter.sol
+++ b/contracts/src/L2/gateways/IL2GatewayRouter.sol
@@ -10,11 +10,6 @@ interface IL2GatewayRouter is IL2ETHGateway, IL2ERC20Gateway {
      * Events *
      **********/
 
-    /// @notice Emitted when the address of ETH Gateway is updated.
-    /// @param oldETHGateway The address of the old ETH Gateway.
-    /// @param newEthGateway The address of the new ETH Gateway.
-    event SetETHGateway(address indexed oldETHGateway, address indexed newEthGateway);
-
     /// @notice Emitted when the address of default ERC20 Gateway is updated.
     /// @param oldDefaultERC20Gateway The address of the old default ERC20 Gateway.
     /// @param newDefaultERC20Gateway The address of the new default ERC20 Gateway.
@@ -25,4 +20,11 @@ interface IL2GatewayRouter is IL2ETHGateway, IL2ERC20Gateway {
     /// @param oldGateway The corresponding address of the old gateway.
     /// @param newGateway The corresponding address of the new gateway.
     event SetERC20Gateway(address indexed token, address indexed oldGateway, address indexed newGateway);
+
+    /**********
+     * Errors *
+     **********/
+
+    /// @dev Thrown when the given address is `address(0)`.
+    error ErrorZeroAddress();
 }
diff --git a/contracts/src/L2/gateways/L2GatewayRouter.sol b/contracts/src/L2/gateways/L2GatewayRouter.sol
index 4a13a91c5b..1237956567 100644
--- a/contracts/src/L2/gateways/L2GatewayRouter.sol
+++ b/contracts/src/L2/gateways/L2GatewayRouter.sol
@@ -15,13 +15,6 @@ import {IL2ERC20Gateway} from "./IL2ERC20Gateway.sol";
 /// @dev One can also use this contract to query L1/L2 token address mapping.
 /// In the future, ERC-721 and ERC-1155 tokens will be added to the router too.
 contract L2GatewayRouter is OwnableUpgradeable, IL2GatewayRouter {
-    /**********
-     * Errors *
-     **********/
-
-    /// @dev Thrown when the given address is `address(0)`.
-    error ErrorZeroAddress();
-
     /*************
      * Constants *
      *************/
@@ -55,7 +48,16 @@ contract L2GatewayRouter is OwnableUpgradeable, IL2GatewayRouter {
         messenger = _messenger;
     }
 
-    function initialize(address _ethGateway, address _defaultERC20Gateway) external initializer {
+    /// @notice Initialize the storage of L2GatewayRouter.
+    ///
+    /// @dev The parameters `_ethGateway` is no longer used.
+    ///
+    /// @param _defaultERC20Gateway The address of default ERC20 Gateway contract.
+    function initialize(
+        address,
+        /*_ethGateway*/
+        address _defaultERC20Gateway
+    ) external initializer {
         OwnableUpgradeable.__Ownable_init();
 
         // it can be zero during initialization
@@ -64,11 +66,13 @@ contract L2GatewayRouter is OwnableUpgradeable, IL2GatewayRouter {
             emit SetDefaultERC20Gateway(address(0), _defaultERC20Gateway);
         }
 
+        /* comment out since it is no longer used.
         // it can be zero during initialization
         if (_ethGateway != address(0)) {
             ethGateway = _ethGateway;
             emit SetETHGateway(address(0), _ethGateway);
         }
+        */
     }
 
     /*************************
@@ -190,16 +194,6 @@ contract L2GatewayRouter is OwnableUpgradeable, IL2GatewayRouter {
      * Restricted Functions *
      ************************/
 
-    /// @notice Update the address of ETH gateway contract.
-    /// @dev This function should only be called by contract owner.
-    /// @param _newEthGateway The address to update.
-    function setETHGateway(address _newEthGateway) external onlyOwner {
-        address _oldEthGateway = ethGateway;
-        ethGateway = _newEthGateway;
-
-        emit SetETHGateway(_oldEthGateway, _newEthGateway);
-    }
-
     /// @notice Update the address of default ERC20 gateway contract.
     /// @dev This function should only be called by contract owner.
     /// @param _newDefaultERC20Gateway The address to update.
diff --git a/contracts/src/test/L2GatewayRouter.t.sol b/contracts/src/test/L2GatewayRouter.t.sol
index 3bd912c8d2..8553287bec 100644
--- a/contracts/src/test/L2GatewayRouter.t.sol
+++ b/contracts/src/test/L2GatewayRouter.t.sol
@@ -114,7 +114,6 @@ contract L2GatewayRouterTest is L2GatewayTestBase {
     }
 
     function testInitialized() public {
-        assertEq(address(l2ETHGateway), router.ethGateway());
         assertEq(address(l2StandardERC20Gateway), router.defaultERC20Gateway());
         assertEq(address(l2StandardERC20Gateway), router.getERC20Gateway(address(l2Token)));
 
@@ -181,20 +180,4 @@ contract L2GatewayRouterTest is L2GatewayTestBase {
         hevm.expectRevert("should never be called");
         router.finalizeDepositETH(address(0), address(0), 0, "");
     }
-
-    function testSetETHGateway(address gateway) public {
-        // set by non-owner, should revert
-        hevm.startPrank(address(1));
-        hevm.expectRevert("Ownable: caller is not the owner");
-        router.setETHGateway(gateway);
-        hevm.stopPrank();
-
-        // set by owner, should succeed
-        hevm.expectEmit(true, true, false, true);
-        emit SetETHGateway(address(l2ETHGateway), gateway);
-
-        assertEq(address(l2ETHGateway), router.ethGateway());
-        router.setETHGateway(gateway);
-        assertEq(gateway, router.ethGateway());
-    }
 }