diff --git a/contracts/.changeset/wet-eyes-accept.md b/contracts/.changeset/wet-eyes-accept.md
new file mode 100644
index 00000000000..ea783366220
--- /dev/null
+++ b/contracts/.changeset/wet-eyes-accept.md
@@ -0,0 +1,7 @@
+---
+'@chainlink/contracts': patch
+---
+
+Refactor MockCCIPRouter to support EVMExtraArgsV2
+
+PR issue : CCIP-4288
diff --git a/contracts/gas-snapshots/ccip.gas-snapshot b/contracts/gas-snapshots/ccip.gas-snapshot
index 54b9cdf22d7..d864b30804d 100644
--- a/contracts/gas-snapshots/ccip.gas-snapshot
+++ b/contracts/gas-snapshots/ccip.gas-snapshot
@@ -257,11 +257,14 @@ MerkleMultiProofTest:test_EmptyLeaf_Revert() (gas: 3563)
 MerkleMultiProofTest:test_MerkleRoot256() (gas: 394891)
 MerkleMultiProofTest:test_MerkleRootSingleLeaf_Success() (gas: 3661)
 MerkleMultiProofTest:test_SpecSync_gas() (gas: 34152)
-MockRouterTest:test_ccipSendWithInsufficientNativeTokens_Revert() (gas: 34081)
-MockRouterTest:test_ccipSendWithInvalidMsgValue_Revert() (gas: 60886)
-MockRouterTest:test_ccipSendWithLinkFeeTokenAndValidMsgValue_Success() (gas: 126575)
-MockRouterTest:test_ccipSendWithLinkFeeTokenbutInsufficientAllowance_Revert() (gas: 63499)
-MockRouterTest:test_ccipSendWithSufficientNativeFeeTokens_Success() (gas: 44056)
+MockRouterTest:test_ccipSendWithEVMExtraArgsV1_Success() (gas: 110095)
+MockRouterTest:test_ccipSendWithEVMExtraArgsV2_Success() (gas: 132614)
+MockRouterTest:test_ccipSendWithInsufficientNativeTokens_Revert() (gas: 34059)
+MockRouterTest:test_ccipSendWithInvalidEVMExtraArgs_Revert() (gas: 106706)
+MockRouterTest:test_ccipSendWithInvalidMsgValue_Revert() (gas: 60864)
+MockRouterTest:test_ccipSendWithLinkFeeTokenAndValidMsgValue_Success() (gas: 126685)
+MockRouterTest:test_ccipSendWithLinkFeeTokenbutInsufficientAllowance_Revert() (gas: 63477)
+MockRouterTest:test_ccipSendWithSufficientNativeFeeTokens_Success() (gas: 44070)
 MultiAggregateRateLimiter_applyRateLimiterConfigUpdates:test_ConfigRateMoreThanCapacity_Revert() (gas: 16554)
 MultiAggregateRateLimiter_applyRateLimiterConfigUpdates:test_ConfigRateZero_Revert() (gas: 16634)
 MultiAggregateRateLimiter_applyRateLimiterConfigUpdates:test_DiableConfigCapacityNonZero_Revert() (gas: 16585)
diff --git a/contracts/src/v0.8/ccip/test/mocks/MockRouter.sol b/contracts/src/v0.8/ccip/test/mocks/MockRouter.sol
index 0abe4fdb7e5..3ded9fd78f0 100644
--- a/contracts/src/v0.8/ccip/test/mocks/MockRouter.sol
+++ b/contracts/src/v0.8/ccip/test/mocks/MockRouter.sol
@@ -121,12 +121,19 @@ contract MockCCIPRouter is IRouter, IRouterClient {
 
   function _fromBytes(
     bytes calldata extraArgs
-  ) internal pure returns (Client.EVMExtraArgsV1 memory) {
+  ) internal pure returns (Client.EVMExtraArgsV2 memory) {
     if (extraArgs.length == 0) {
-      return Client.EVMExtraArgsV1({gasLimit: DEFAULT_GAS_LIMIT});
+      return Client.EVMExtraArgsV2({gasLimit: DEFAULT_GAS_LIMIT, allowOutOfOrderExecution: false});
     }
-    if (bytes4(extraArgs) != Client.EVM_EXTRA_ARGS_V1_TAG) revert InvalidExtraArgsTag();
-    return abi.decode(extraArgs[4:], (Client.EVMExtraArgsV1));
+
+    bytes4 extraArgsTag = bytes4(extraArgs);
+    if (extraArgsTag == Client.EVM_EXTRA_ARGS_V2_TAG) {
+      return abi.decode(extraArgs[4:], (Client.EVMExtraArgsV2));
+    } else if (extraArgsTag == Client.EVM_EXTRA_ARGS_V1_TAG) {
+      return Client.EVMExtraArgsV2({gasLimit: abi.decode(extraArgs[4:], (uint256)), allowOutOfOrderExecution: false});
+    }
+
+    revert InvalidExtraArgsTag();
   }
 
   /// @notice Always returns true to make sure this check can be performed on any chain.
diff --git a/contracts/src/v0.8/ccip/test/mocks/test/MockRouterTest.t.sol b/contracts/src/v0.8/ccip/test/mocks/test/MockRouterTest.t.sol
index cd0aabf1776..549d6b8f843 100644
--- a/contracts/src/v0.8/ccip/test/mocks/test/MockRouterTest.t.sol
+++ b/contracts/src/v0.8/ccip/test/mocks/test/MockRouterTest.t.sol
@@ -65,4 +65,24 @@ contract MockRouterTest is TokenSetup {
 
     mockRouter.ccipSend(MOCK_CHAIN_SELECTOR, message);
   }
+
+  function test_ccipSendWithEVMExtraArgsV1_Success() public {
+    Client.EVMExtraArgsV1 memory extraArgs = Client.EVMExtraArgsV1({gasLimit: 500_000});
+    message.extraArgs = Client._argsToBytes(extraArgs);
+    mockRouter.ccipSend{value: 0.1 ether}(MOCK_CHAIN_SELECTOR, message);
+  }
+
+  function test_ccipSendWithEVMExtraArgsV2_Success() public {
+    Client.EVMExtraArgsV2 memory extraArgs = Client.EVMExtraArgsV2({gasLimit: 500_000, allowOutOfOrderExecution: true});
+    message.extraArgs = Client._argsToBytes(extraArgs);
+    mockRouter.ccipSend{value: 0.1 ether}(MOCK_CHAIN_SELECTOR, message);
+  }
+
+  function test_ccipSendWithInvalidEVMExtraArgs_Revert() public {
+    uint256 gasLimit = 500_000;
+    bytes4 invalidExtraArgsTag = bytes4(keccak256("CCIP EVMExtraArgsInvalid"));
+    message.extraArgs = abi.encodeWithSelector(invalidExtraArgsTag, gasLimit);
+    vm.expectRevert(MockCCIPRouter.InvalidExtraArgsTag.selector);
+    mockRouter.ccipSend{value: 0.1 ether}(MOCK_CHAIN_SELECTOR, message);
+  }
 }