diff --git a/packages/contracts-bedrock/.gas-snapshot b/packages/contracts-bedrock/.gas-snapshot
index 5c0e2a2b2776..848ad2793e95 100644
--- a/packages/contracts-bedrock/.gas-snapshot
+++ b/packages/contracts-bedrock/.gas-snapshot
@@ -1,11 +1,11 @@
-GasBenchMark_L1CrossDomainMessenger:test_sendMessage_benchmark_0() (gas: 369249)
-GasBenchMark_L1CrossDomainMessenger:test_sendMessage_benchmark_1() (gas: 2967456)
-GasBenchMark_L1StandardBridge_Deposit:test_depositERC20_benchmark_0() (gas: 561864)
-GasBenchMark_L1StandardBridge_Deposit:test_depositERC20_benchmark_1() (gas: 4074012)
-GasBenchMark_L1StandardBridge_Deposit:test_depositETH_benchmark_0() (gas: 466963)
-GasBenchMark_L1StandardBridge_Deposit:test_depositETH_benchmark_1() (gas: 3512712)
-GasBenchMark_L1StandardBridge_Finalize:test_finalizeETHWithdrawal_benchmark() (gas: 72650)
+GasBenchMark_L1CrossDomainMessenger:test_sendMessage_benchmark_0() (gas: 369293)
+GasBenchMark_L1CrossDomainMessenger:test_sendMessage_benchmark_1() (gas: 2967500)
+GasBenchMark_L1StandardBridge_Deposit:test_depositERC20_benchmark_0() (gas: 561908)
+GasBenchMark_L1StandardBridge_Deposit:test_depositERC20_benchmark_1() (gas: 4074056)
+GasBenchMark_L1StandardBridge_Deposit:test_depositETH_benchmark_0() (gas: 467029)
+GasBenchMark_L1StandardBridge_Deposit:test_depositETH_benchmark_1() (gas: 3512778)
+GasBenchMark_L1StandardBridge_Finalize:test_finalizeETHWithdrawal_benchmark() (gas: 72672)
 GasBenchMark_L2OutputOracle:test_proposeL2Output_benchmark() (gas: 92974)
-GasBenchMark_OptimismPortal:test_depositTransaction_benchmark() (gas: 68303)
-GasBenchMark_OptimismPortal:test_depositTransaction_benchmark_1() (gas: 68967)
+GasBenchMark_OptimismPortal:test_depositTransaction_benchmark() (gas: 68325)
+GasBenchMark_OptimismPortal:test_depositTransaction_benchmark_1() (gas: 68989)
 GasBenchMark_OptimismPortal:test_proveWithdrawalTransaction_benchmark() (gas: 155523)
\ No newline at end of file
diff --git a/packages/contracts-bedrock/semver-lock.json b/packages/contracts-bedrock/semver-lock.json
index 4d72cfb4b2e4..79e22a8a740f 100644
--- a/packages/contracts-bedrock/semver-lock.json
+++ b/packages/contracts-bedrock/semver-lock.json
@@ -48,8 +48,8 @@
     "sourceCodeHash": "0xd6a894e371c2c7182b5960c507491f81c3775dda0efedd29475f7c30ca07b004"
   },
   "src/L1/SystemConfig.sol": {
-    "initCodeHash": "0xb55e02e755e8b24382e82e646cbe2ce3cfe509672b341bc2d6da53de951484e2",
-    "sourceCodeHash": "0xdedea0fc472bcaae16f62f021568b87d3a72be47f9f490860ce871156edf838b"
+    "initCodeHash": "0x57f660e03393c5da321cc26cdf497c883982d4be93bcdb81955cce66e8a52168",
+    "sourceCodeHash": "0xf99c51d92bdb634907dc06bb4e9c6cbc5d3e6c235d28f2ee0997ccd0ea0246b7"
   },
   "src/L2/BaseFeeVault.sol": {
     "initCodeHash": "0x2744d34573be83206d1b75d049d18a7bb37f9058e68c0803e5008c46b0dc2474",
diff --git a/packages/contracts-bedrock/test/Specs.t.sol b/packages/contracts-bedrock/test/Specs.t.sol
index 44260cb0b948..c6fc0da2f68d 100644
--- a/packages/contracts-bedrock/test/Specs.t.sol
+++ b/packages/contracts-bedrock/test/Specs.t.sol
@@ -382,6 +382,7 @@ contract Specification_Test is CommonTest {
         _addSpec({ _name: "SystemConfig", _sel: _getSel("gasPayingToken()") });
         _addSpec({ _name: "SystemConfig", _sel: _getSel("gasPayingTokenName()") });
         _addSpec({ _name: "SystemConfig", _sel: _getSel("gasPayingTokenSymbol()") });
+        _addSpec({ _name: "SystemConfig", _sel: _getSel("isCustomGasToken()") });
 
         // ProxyAdmin
         _addSpec({ _name: "ProxyAdmin", _sel: _getSel("addressManager()") });