diff --git a/packages/contracts/package.json b/packages/contracts/package.json
index 9152a3b4b9596..cb9982cb1b9bb 100644
--- a/packages/contracts/package.json
+++ b/packages/contracts/package.json
@@ -39,6 +39,7 @@
   "dependencies": {
     "@eth-optimism/core-db": "^0.0.1-alpha.25",
     "@eth-optimism/core-utils": "^0.0.1-alpha.25",
+    "@ethersproject/keccak256": "5.0.3",
     "@eth-optimism/solc-transpiler": "^0.0.1-alpha.27",
     "@nomiclabs/buidler": "^1.3.8",
     "@nomiclabs/buidler-ethers": "^2.0.0",
diff --git a/packages/contracts/test/deployment/geth-input-dump.spec.ts b/packages/contracts/test/deployment/geth-input-dump.spec.ts
index 1e4b24f67d335..875203bf34b1c 100644
--- a/packages/contracts/test/deployment/geth-input-dump.spec.ts
+++ b/packages/contracts/test/deployment/geth-input-dump.spec.ts
@@ -3,6 +3,9 @@ import { expect } from '../setup'
 /* External Imports */
 import { ethers } from '@nomiclabs/buidler'
 
+import L2ToL1MessagePasser = require('../../artifacts/L2ToL1MessagePasser.json')
+import L1MessageSender = require('../../artifacts/L1MessageSender.json')
+
 /* Internal Imports */
 import { deployAllContracts } from '../../src'
 import {
@@ -10,6 +13,7 @@ import {
   factoryToContractName,
 } from '../../src/deployment/types'
 import { Signer, Transaction } from 'ethers'
+import { keccak256 } from '@ethersproject/keccak256'
 import {
   GAS_LIMIT,
   DEFAULT_FORCE_INCLUSION_PERIOD_SECONDS,
@@ -57,6 +61,7 @@ describe.skip('L2Geth Dumper Input Generator', () => {
       walletAddress: string
       executionManagerAddress: string
       stateManagerAddress: string
+      codeHashes: Object
     }
 
     const getSimplifiedTx = (tx: Transaction): SimplifiedTx => {
@@ -75,6 +80,17 @@ describe.skip('L2Geth Dumper Input Generator', () => {
       walletAddress: await wallet.getAddress(),
       executionManagerAddress: resolver.contracts.executionManager.address,
       stateManagerAddress: resolver.contracts.stateManager.address,
+      codeHashes: {
+        l2ToL1MessagePasser: keccak256(L2ToL1MessagePasser.deployedBytecode),
+        l1MessageSender: keccak256(L1MessageSender.deployedBytecode),
+      },
+    }
+
+    for (const [name, contract] of Object.entries(resolver.contracts)) {
+      const address = contract.address
+      const code = await contract.provider.getCode(address)
+      const hash = keccak256(code)
+      gethDumpInput.codeHashes[name] = hash
     }
 
     // Write all the simplified transactions data to a file