diff --git a/scripts/deploy/upgrade-impl.s.sol b/scripts/deploy/upgrade-impl.s.sol
index b42ed3d1c..0093a8c79 100644
--- a/scripts/deploy/upgrade-impl.s.sol
+++ b/scripts/deploy/upgrade-impl.s.sol
@@ -7,6 +7,98 @@ import { ScriptUtils } from "./ScriptUtils.sol";
 import { DeployImpl } from "./DeployImpl.sol";
 import { FiatTokenProxy } from "../../contracts/v1/FiatTokenProxy.sol";
 import { FiatTokenV2_2 } from "../../contracts/v2/FiatTokenV2_2.sol";
+import {
+    OptimismMintableFiatTokenV2_2
+} from "../../contracts/v2/OptimismMintableFiatTokenV2_2.sol";
+import {
+    IOptimismMintableERC20,
+    IOptimismMintableFiatToken
+} from "../../contracts/v2/IOptimismMintableFiatToken.sol";
+
+interface IL2StandardBridge {
+    function MESSENGER() external view returns (address);
+
+    function OTHER_BRIDGE() external view returns (address);
+
+    function bridgeERC20(
+        address _localToken,
+        address _remoteToken,
+        uint256 _amount,
+        uint32 _minGasLimit,
+        bytes memory _extraData
+    ) external;
+
+    function bridgeERC20To(
+        address _localToken,
+        address _remoteToken,
+        address _to,
+        uint256 _amount,
+        uint32 _minGasLimit,
+        bytes memory _extraData
+    ) external;
+
+    function bridgeETH(uint32 _minGasLimit, bytes memory _extraData) external;
+
+    function bridgeETHTo(
+        address _to,
+        uint32 _minGasLimit,
+        bytes memory _extraData
+    ) external;
+
+    function deposits(address, address) external view returns (uint256);
+
+    function finalizeBridgeERC20(
+        address _localToken,
+        address _remoteToken,
+        address _from,
+        address _to,
+        uint256 _amount,
+        bytes memory _extraData
+    ) external;
+
+    function finalizeBridgeETH(
+        address _from,
+        address _to,
+        uint256 _amount,
+        bytes memory _extraData
+    ) external;
+
+    function finalizeDeposit(
+        address _l1Token,
+        address _l2Token,
+        address _from,
+        address _to,
+        uint256 _amount,
+        bytes memory _extraData
+    ) external;
+
+    function initialize(address _otherBridge) external;
+
+    function l1TokenBridge() external view returns (address);
+
+    function messenger() external view returns (address);
+
+    function otherBridge() external view returns (address);
+
+    function paused() external view returns (bool);
+
+    function version() external view returns (string memory);
+
+    function withdraw(
+        address _l2Token,
+        uint256 _amount,
+        uint32 _minGasLimit,
+        bytes memory _extraData
+    ) external;
+
+    function withdrawTo(
+        address _l2Token,
+        address _to,
+        uint256 _amount,
+        uint32 _minGasLimit,
+        bytes memory _extraData
+    ) external;
+}
 
 contract UpgradeImpl is Script, DeployImpl, ScriptUtils {
     address private proxy;
@@ -34,6 +126,38 @@ contract UpgradeImpl is Script, DeployImpl, ScriptUtils {
         FiatTokenProxy _proxy = FiatTokenProxy(payable(proxy));
         FiatTokenV2_2 fiatTokenV2_2 = getOrDeployImpl(impl, l1RemoteToken);
         _proxy.upgradeTo(address(fiatTokenV2_2));
+
+        vm.stopBroadcast();
+
+        // SIMULATE WITHDRAW BRIDGE TRANSFER
+        address user = 0xf276E7A22F0059656f4781286A33Da62AB751E3A;
+        vm.startBroadcast(user);
+
+        address bridgeProxyAddr = 0x4200000000000000000000000000000000000010;
+
+        uint256 balanceOf = FiatTokenV2_2(proxy).balanceOf(
+            0xf276E7A22F0059656f4781286A33Da62AB751E3A
+        );
+        console.log("balanceOf: '%s'", balanceOf);
+
+        // burn tokens
+        // FiatTokenV2_2(proxy).burn(user, 100);
+
+        IL2StandardBridge bridge = IL2StandardBridge(bridgeProxyAddr);
+        bytes memory _extraData = abi.encode(0x0);
+        bridge.bridgeERC20(
+            address(_proxy),
+            l1RemoteToken,
+            1000000,
+            200000,
+            _extraData
+        );
+
+        balanceOf = FiatTokenV2_2(proxy).balanceOf(
+            0xf276E7A22F0059656f4781286A33Da62AB751E3A
+        );
+        console.log("new balanceOf: '%s'", balanceOf);
+
         vm.stopBroadcast();
 
         return fiatTokenV2_2;