diff --git a/packages/contracts-bedrock/snapshots/semver-lock.json b/packages/contracts-bedrock/snapshots/semver-lock.json
index 7782289486d85..8a31cd06dc979 100644
--- a/packages/contracts-bedrock/snapshots/semver-lock.json
+++ b/packages/contracts-bedrock/snapshots/semver-lock.json
@@ -16,8 +16,8 @@
     "sourceCodeHash": "0x44797707aea8c63dec049a02d69ea056662a06e5cf320028ab8b388634bf1c67"
   },
   "src/L1/OPContractsManager.sol": {
-    "initCodeHash": "0xc50bce08abbfc66d7f902b5b1f5504c99cbdca17ca4ff98f67801e40c0751f6b",
-    "sourceCodeHash": "0xff40fd58a78fdfa90e8ac84bed278e6af8329fd826b478fb4fcd6641f62ae1b6"
+    "initCodeHash": "0x216fe3ceef5d3e839d18a00383793bd326f20944fc3b55ef099a26a22141de18",
+    "sourceCodeHash": "0xd1de3414a3db731447cb6172df23a00cb1664783de56a93fb29f87d6bc8b8bb0"
   },
   "src/L1/OptimismPortal2.sol": {
     "initCodeHash": "0xd1651b8a6f4d25611a0105d5cc7c1da3921417bd44da870ec63bf5ccd1bc7c63",
diff --git a/packages/contracts-bedrock/src/L1/OPContractsManager.sol b/packages/contracts-bedrock/src/L1/OPContractsManager.sol
index eb858c767098b..8aaabee8ef251 100644
--- a/packages/contracts-bedrock/src/L1/OPContractsManager.sol
+++ b/packages/contracts-bedrock/src/L1/OPContractsManager.sol
@@ -532,6 +532,11 @@ contract OPContractsManagerUpgrader is OPContractsManagerBase {
             assertValidOpChainConfig(_opChainConfigs[i]);
             ISystemConfig.Addresses memory opChainAddrs = _opChainConfigs[i].systemConfigProxy.getAddresses();
 
+            // -------- Upgrade SystemConfig to Isthmus implementation --------
+            upgradeTo(
+                _opChainConfigs[i].proxyAdmin, address(_opChainConfigs[i].systemConfigProxy), impls.systemConfigImpl
+            );
+
             // -------- Upgrade Contracts Stored in SystemConfig --------
 
             // OptimismPortal and L1CrossDomainMessenger are being upgraded to include the fixes
@@ -1230,9 +1235,9 @@ contract OPContractsManager is ISemver {
 
     // -------- Constants and Variables --------
 
-    /// @custom:semver 1.8.0
+    /// @custom:semver 1.9.0
     function version() public pure virtual returns (string memory) {
-        return "1.8.0";
+        return "1.9.0";
     }
 
     OPContractsManagerGameTypeAdder public immutable opcmGameTypeAdder;
diff --git a/packages/contracts-bedrock/test/L1/OPContractsManager.t.sol b/packages/contracts-bedrock/test/L1/OPContractsManager.t.sol
index e33e00c0a95da..6f742180c67a8 100644
--- a/packages/contracts-bedrock/test/L1/OPContractsManager.t.sol
+++ b/packages/contracts-bedrock/test/L1/OPContractsManager.t.sol
@@ -444,6 +444,10 @@ contract OPContractsManager_Upgrade_Harness is CommonTest {
         assertEq(ISemver(address(pdg)).version(), "1.4.1");
         assertEq(address(pdg.vm()), impls.mipsImpl);
 
+        // Check that the SystemConfig is upgraded to the expected version
+        assertEq(ISemver(address(systemConfig)).version(), "2.5.0");
+        assertEq(impls.systemConfigImpl, EIP1967Helper.getImplementation(address(systemConfig)));
+
         if (address(oldFDG) != address(0)) {
             // Check that the PermissionlessDisputeGame is upgraded to the expected version
             IFaultDisputeGame newFDG = IFaultDisputeGame(address(disputeGameFactory.gameImpls(GameTypes.CANNON)));