diff --git a/scripts/checks/interfaces/main.go b/scripts/checks/interfaces/main.go
index 9274ad843..ddff55d51 100644
--- a/scripts/checks/interfaces/main.go
+++ b/scripts/checks/interfaces/main.go
@@ -24,8 +24,12 @@ func normalizeInternalType(internalType string) string {
 var excludeContracts = []string{
 	"IProxy", "IEIP712", "IEAS", "ISchemaResolver", "ISchemaRegistry",
 
+	// ERC-165 interfaces that bridges check deployed tokens against. Must never become ABI mirrors,
+	// since any change to their functions changes the interface ID and strands existing tokens.
+	"IOptimismMintableERC20",
+
 	// TODO: Interfaces that need to be fixed
-	"IInitializable", "IOptimismMintableERC20", "IResolvedDelegateProxy",
+	"IInitializable", "IResolvedDelegateProxy",
 }
 
 // excludeSourceContracts is a list of contracts that are allowed to not have interfaces
diff --git a/snapshots/semver-lock.json b/snapshots/semver-lock.json
index b4702b3f4..3e786cfbb 100644
--- a/snapshots/semver-lock.json
+++ b/snapshots/semver-lock.json
@@ -80,8 +80,8 @@
     "sourceCodeHash": "0x12ea125038b87e259a0d203e119faa6e9726ab2bdbc30430f820ccd48fe87e14"
   },
   "src/L2/L2ERC721Bridge.sol:L2ERC721Bridge": {
-    "initCodeHash": "0xe9d79ab92871ff7d1336059a8756041e052bca05f2c0e98d20ed97f545162191",
-    "sourceCodeHash": "0x032bda19a2c0a05e8abfdac182982ad14256cbcebc1896ba503bb1a2a681e81f"
+    "initCodeHash": "0x6e3e9c0aee26dcdf2e866a076e04322c9fe358ed1b0cc278c3ebdd23227dd868",
+    "sourceCodeHash": "0x6f1e82203041282f13949525c092d1ce1221df5d29429148e3c1b20b20aa9f99"
   },
   "src/L2/L2StandardBridge.sol:L2StandardBridge": {
     "initCodeHash": "0x61f1e19928b92a5455d04c990071728b006d2083887250f473f147cd9002345f",
@@ -96,12 +96,12 @@
     "sourceCodeHash": "0xd6e94bc9df025855916aa4184d0bc739b0fbe786dfd037b99dbb51d0d3e46918"
   },
   "src/L2/OptimismMintableERC721.sol:OptimismMintableERC721": {
-    "initCodeHash": "0x363dcb59140ecfbcdff7b5f4e822f0fdc8492fc02b6d9abf3cb822ae75e8dcfb",
-    "sourceCodeHash": "0xe9271c174be0579d59221bdcd66e408c0327a72a7898175bf3df6919863ef1cb"
+    "initCodeHash": "0x2b0a211f46ad957a142a73d61760809494dc212cd0c366ca5407f24f211ea810",
+    "sourceCodeHash": "0x8ae7768566b70e28bd2529c070831095b4087802f9012a0e95121f21eec9e4cb"
   },
   "src/L2/OptimismMintableERC721Factory.sol:OptimismMintableERC721Factory": {
-    "initCodeHash": "0x3f31209e30a79f367b59b66e3ee6f43f5916ec26e6d1c5a08846d636884f020d",
-    "sourceCodeHash": "0xb0be3deac32956251adb37d3ca61f619ca4348a1355a41c856a3a95adde0e4ff"
+    "initCodeHash": "0x4a584d196f965d239cf31f63b54fde68dab1dc151b5e4b700380102380abe707",
+    "sourceCodeHash": "0x93ca86cc152da8633ceb9f35e171b418bd4d90e52ed05ccde3e1026039272cb4"
   },
   "src/L2/SequencerFeeVault.sol:SequencerFeeVault": {
     "initCodeHash": "0xd80f5cee90a78db1f7a506d5b6eaa22ff672a78cb2fd7ce9b7130c1ce571ffa9",
diff --git a/src/L2/L2ERC721Bridge.sol b/src/L2/L2ERC721Bridge.sol
index 4c34051a1..b58408366 100644
--- a/src/L2/L2ERC721Bridge.sol
+++ b/src/L2/L2ERC721Bridge.sol
@@ -7,6 +7,7 @@ import { ERC721Bridge } from "src/universal/ERC721Bridge.sol";
 // Libraries
 import { ERC165Checker } from "lib/openzeppelin-contracts/contracts/utils/introspection/ERC165Checker.sol";
 import { Predeploys } from "src/libraries/Predeploys.sol";
+import { Constants } from "src/libraries/Constants.sol";
 
 // Interfaces
 import { IL1ERC721Bridge } from "interfaces/L1/IL1ERC721Bridge.sol";
@@ -24,8 +25,8 @@ import { ISemver } from "interfaces/universal/ISemver.sol";
 ///         **WARNING**: Do not bridge an ERC721 that was originally deployed on Optimism. This
 ///         bridge ONLY supports ERC721s originally deployed on Ethereum.
 contract L2ERC721Bridge is ERC721Bridge, ISemver {
-    /// @custom:semver 1.10.0
-    string public constant version = "1.10.0";
+    /// @custom:semver 1.11.0
+    string public constant version = "1.11.0";
 
     /// @notice Constructs the L2ERC721Bridge contract.
     constructor() ERC721Bridge() {
@@ -67,7 +68,11 @@ contract L2ERC721Bridge is ERC721Bridge, ISemver {
         // Note that supportsInterface makes a callback to the _localToken address which is user
         // provided.
         require(
-            ERC165Checker.supportsInterface(_localToken, type(IOptimismMintableERC721).interfaceId),
+            ERC165Checker.supportsInterface(_localToken, Constants.OPTIMISM_MINTABLE_ERC721_INTERFACE_ID)
+                || ERC165Checker.supportsInterface(_localToken, Constants.BEDROCK_OPTIMISM_MINTABLE_ERC721_INTERFACE_ID)
+                || ERC165Checker.supportsInterface(
+                    _localToken, Constants.PRE_BEDROCK_OPTIMISM_MINTABLE_ERC721_INTERFACE_ID
+                ),
             "L2ERC721Bridge: local token interface is not compliant"
         );
 
diff --git a/src/L2/OptimismMintableERC721.sol b/src/L2/OptimismMintableERC721.sol
index 91a31c0e8..4057e4af6 100644
--- a/src/L2/OptimismMintableERC721.sol
+++ b/src/L2/OptimismMintableERC721.sol
@@ -7,10 +7,10 @@ import { ERC721 } from "lib/openzeppelin-contracts/contracts/token/ERC721/ERC721
 
 // Libraries
 import { Strings } from "lib/openzeppelin-contracts/contracts/utils/Strings.sol";
+import { Constants } from "src/libraries/Constants.sol";
 
 // Interfaces
 import { ISemver } from "interfaces/universal/ISemver.sol";
-import { IOptimismMintableERC721 } from "interfaces/L2/IOptimismMintableERC721.sol";
 
 /// @title OptimismMintableERC721
 /// @notice This contract is the remote representation for some token that lives on another network,
@@ -46,8 +46,8 @@ contract OptimismMintableERC721 is ERC721Enumerable, ISemver {
     }
 
     /// @notice Semantic version.
-    /// @custom:semver 1.3.2
-    string public constant version = "1.3.2";
+    /// @custom:semver 1.4.0
+    string public constant version = "1.4.0";
 
     /// @param _bridge        Address of the bridge on this network.
     /// @param _remoteChainId Chain ID where the remote token is deployed.
@@ -122,8 +122,9 @@ contract OptimismMintableERC721 is ERC721Enumerable, ISemver {
     /// @param _interfaceId The interface ID to check.
     /// @return True if the interface ID is supported, false otherwise.
     function supportsInterface(bytes4 _interfaceId) public view override(ERC721Enumerable) returns (bool) {
-        bytes4 iface = type(IOptimismMintableERC721).interfaceId;
-        return _interfaceId == iface || super.supportsInterface(_interfaceId);
+        return _interfaceId == Constants.OPTIMISM_MINTABLE_ERC721_INTERFACE_ID
+            || _interfaceId == Constants.BEDROCK_OPTIMISM_MINTABLE_ERC721_INTERFACE_ID
+            || super.supportsInterface(_interfaceId);
     }
 
     /// @notice Returns the base token URI.
diff --git a/src/L2/OptimismMintableERC721Factory.sol b/src/L2/OptimismMintableERC721Factory.sol
index 3838e5905..728d8ef46 100644
--- a/src/L2/OptimismMintableERC721Factory.sol
+++ b/src/L2/OptimismMintableERC721Factory.sol
@@ -30,8 +30,8 @@ contract OptimismMintableERC721Factory is ISemver {
     event OptimismMintableERC721Created(address indexed localToken, address indexed remoteToken, address deployer);
 
     /// @notice Semantic version.
-    /// @custom:semver 1.4.2
-    string public constant version = "1.4.2";
+    /// @custom:semver 1.5.0
+    string public constant version = "1.5.0";
 
     /// @notice The semver MUST be bumped any time that there is a change in
     ///         the OptimismMintableERC721 token contract since this contract
diff --git a/src/libraries/Constants.sol b/src/libraries/Constants.sol
index 50ad71669..c2c3e0182 100644
--- a/src/libraries/Constants.sol
+++ b/src/libraries/Constants.sol
@@ -42,6 +42,21 @@ library Constants {
     ///         transactions.
     address internal constant DEPOSITOR_ACCOUNT = 0xDeaDDEaDDeAdDeAdDEAdDEaddeAddEAdDEAd0001;
 
+    /// @notice ERC-165 interface ID of OptimismMintableERC721 tokens built from source between
+    ///         September 2022 and Bedrock. Those tokens can't be upgraded, so this ID must be
+    ///         accepted forever.
+    bytes4 internal constant PRE_BEDROCK_OPTIMISM_MINTABLE_ERC721_INTERFACE_ID = 0xe49bc7f8;
+
+    /// @notice ERC-165 interface ID of OptimismMintableERC721 tokens built from source between
+    ///         Bedrock and op-contracts v1.8.0. Those tokens can't be upgraded, so this ID must be
+    ///         accepted forever. Newer tokens answer it too, so that older bridges accept them.
+    bytes4 internal constant BEDROCK_OPTIMISM_MINTABLE_ERC721_INTERFACE_ID = 0x74259ebf;
+
+    /// @notice ERC-165 interface ID answered by OptimismMintableERC721 tokens built from
+    ///         op-contracts v1.8.0 source onwards. Written as a literal because
+    ///         type(IOptimismMintableERC721) changes whenever the contract's ABI does.
+    bytes4 internal constant OPTIMISM_MINTABLE_ERC721_INTERFACE_ID = 0xaecafc23;
+
     /// @notice Returns the default values for the ResourceConfig. These are the recommended values
     ///         for a production network.
     function DEFAULT_RESOURCE_CONFIG() internal pure returns (IResourceMetering.ResourceConfig memory) {
diff --git a/test/L2/L2ERC721Bridge.t.sol b/test/L2/L2ERC721Bridge.t.sol
index 07f15b0cb..3e2ed80b6 100644
--- a/test/L2/L2ERC721Bridge.t.sol
+++ b/test/L2/L2ERC721Bridge.t.sol
@@ -5,6 +5,7 @@ pragma solidity 0.8.15;
 import { CommonTest } from "test/setup/CommonTest.sol";
 
 // Contracts
+import { ERC721 } from "lib/openzeppelin-contracts/contracts/token/ERC721/ERC721.sol";
 import { OptimismMintableERC721 } from "src/L2/OptimismMintableERC721.sol";
 
 // Interfaces
@@ -23,6 +24,31 @@ contract L2ERC721Bridge_TestMintableERC721_Harness is OptimismMintableERC721 {
     }
 }
 
+/// @title L2ERC721Bridge_FixedInterfaceIdERC721_Harness
+/// @notice An OptimismMintableERC721 stand-in that answers a single, fixed interface ID, like a
+///         token deployed by an earlier factory that can't be upgraded.
+contract L2ERC721Bridge_FixedInterfaceIdERC721_Harness is ERC721 {
+    address internal immutable REMOTE_TOKEN;
+    bytes4 internal immutable INTERFACE_ID;
+
+    constructor(address _remoteToken, bytes4 _interfaceId) ERC721("Test", "TST") {
+        REMOTE_TOKEN = _remoteToken;
+        INTERFACE_ID = _interfaceId;
+    }
+
+    function remoteToken() external view returns (address) {
+        return REMOTE_TOKEN;
+    }
+
+    function safeMint(address _to, uint256 _tokenId) external {
+        _safeMint(_to, _tokenId);
+    }
+
+    function supportsInterface(bytes4 _interfaceId) public view override returns (bool) {
+        return _interfaceId == INTERFACE_ID || super.supportsInterface(_interfaceId);
+    }
+}
+
 /// @title NonCompliantERC721
 /// @notice A non-compliant ERC721 token that does not implement the full ERC721 interface.
 ///         This is used to test that the bridge will revert if the token does not claim to
@@ -166,6 +192,35 @@ contract L2ERC721Bridge_FinalizeBridgeERC721_Test is L2ERC721Bridge_Bridge_TestI
         _assertTokenOwnedBy(alice);
     }
 
+    /// @notice Tests that `finalizeBridgeERC721` mints a token that only answers the interface ID
+    ///         of tokens built from source between Bedrock and op-contracts v1.8.0.
+    function test_finalizeBridgeERC721_bedrockInterfaceId_succeeds() external {
+        _finalizeBridgeERC721ToFixedInterfaceIdToken(0x74259ebf);
+    }
+
+    /// @notice Tests that `finalizeBridgeERC721` mints a token that only answers the interface ID
+    ///         of tokens built from source between September 2022 and Bedrock.
+    function test_finalizeBridgeERC721_preBedrockInterfaceId_succeeds() external {
+        _finalizeBridgeERC721ToFixedInterfaceIdToken(0xe49bc7f8);
+    }
+
+    /// @notice Tests that `finalizeBridgeERC721` mints a token that only answers the interface ID
+    ///         of tokens built from op-contracts v1.8.0 source onwards.
+    function test_finalizeBridgeERC721_currentInterfaceId_succeeds() external {
+        _finalizeBridgeERC721ToFixedInterfaceIdToken(0xaecafc23);
+    }
+
+    function _finalizeBridgeERC721ToFixedInterfaceIdToken(bytes4 _interfaceId) internal {
+        L2ERC721Bridge_FixedInterfaceIdERC721_Harness token =
+            new L2ERC721Bridge_FixedInterfaceIdERC721_Harness(remoteToken, _interfaceId);
+
+        _mockOtherBridge();
+        vm.prank(address(l2ERC721Bridge.messenger()));
+        l2ERC721Bridge.finalizeBridgeERC721(address(token), remoteToken, alice, alice, tokenId, EXTRA_DATA);
+
+        assertEq(token.ownerOf(tokenId), alice);
+    }
+
     /// @notice Tests that `finalizeBridgeERC721` reverts if the token is not compliant with the
     ///         `IOptimismMintableERC721` interface.
     function test_finalizeBridgeERC721_interfaceNotCompliant_reverts() external {
diff --git a/test/L2/OptimismMintableERC721.t.sol b/test/L2/OptimismMintableERC721.t.sol
index 0783be4a6..e3869d65d 100644
--- a/test/L2/OptimismMintableERC721.t.sol
+++ b/test/L2/OptimismMintableERC721.t.sol
@@ -6,7 +6,7 @@ import { IERC721Enumerable } from "lib/openzeppelin-contracts/contracts/token/ER
 import { IERC165 } from "lib/openzeppelin-contracts/contracts/utils/introspection/IERC165.sol";
 import { Strings } from "lib/openzeppelin-contracts/contracts/utils/Strings.sol";
 import { CommonTest } from "test/setup/CommonTest.sol";
-import { OptimismMintableERC721, IOptimismMintableERC721 } from "src/L2/OptimismMintableERC721.sol";
+import { OptimismMintableERC721 } from "src/L2/OptimismMintableERC721.sol";
 
 /// @title OptimismMintableERC721_TestInit
 /// @notice Reusable test initialization for `OptimismMintableERC721` tests.
@@ -133,10 +133,12 @@ contract OptimismMintableERC721_Burn_Test is OptimismMintableERC721_TestInit {
 /// @title OptimismMintableERC721_SupportsInterface_Test
 /// @notice Tests the `supportsInterface` function of the `OptimismMintableERC721` contract.
 contract OptimismMintableERC721_SupportsInterface_Test is OptimismMintableERC721_TestInit {
-    /// @notice Tests that the `supportsInterface` function returns true for
-    ///         IOptimismMintableERC721, IERC721Enumerable, IERC721 and IERC165 interfaces.
+    /// @notice Tests that the `supportsInterface` function returns true for both
+    ///         IOptimismMintableERC721 interface IDs, IERC721Enumerable, IERC721 and IERC165.
     function test_supportsInterface_succeeds() external view {
-        assertTrue(L2NFT.supportsInterface(type(IOptimismMintableERC721).interfaceId));
+        // Bridges check tokens against these IDs, so they must never change.
+        assertTrue(L2NFT.supportsInterface(0x74259ebf));
+        assertTrue(L2NFT.supportsInterface(0xaecafc23));
         assertTrue(L2NFT.supportsInterface(type(IERC721Enumerable).interfaceId));
         assertTrue(L2NFT.supportsInterface(type(IERC721).interfaceId));
         assertTrue(L2NFT.supportsInterface(type(IERC165).interfaceId));
diff --git a/test/universal/OptimismMintableERC20.t.sol b/test/universal/OptimismMintableERC20.t.sol
index 4b0475b96..3b95e96be 100644
--- a/test/universal/OptimismMintableERC20.t.sol
+++ b/test/universal/OptimismMintableERC20.t.sol
@@ -86,6 +86,13 @@ contract OptimismMintableERC20_SupportsInterface_Test is OptimismMintableERC20_T
         assertTrue(L2Token.supportsInterface(type(IERC165).interfaceId));
         assertTrue(L2Token.supportsInterface(type(ILegacyMintableERC20).interfaceId));
         assertTrue(L2Token.supportsInterface(type(IOptimismMintableERC20).interfaceId));
+
+        // Bridges check deployed tokens against these two IDs, so changing either one strands
+        // every existing token.
+        // l1Token() ^ mint(address,uint256) ^ burn(address,uint256)
+        assertEq(type(ILegacyMintableERC20).interfaceId, bytes4(0x1d1d8b63));
+        // remoteToken() ^ bridge() ^ mint(address,uint256) ^ burn(address,uint256)
+        assertEq(type(IOptimismMintableERC20).interfaceId, bytes4(0xec4fc8e3));
     }
 }