diff --git a/archive/DODOV2Proxy01.sol b/archive/DODOV2Proxy01.sol
index 0e5c678..0da3d72 100644
--- a/archive/DODOV2Proxy01.sol
+++ b/archive/DODOV2Proxy01.sol
@@ -335,7 +335,7 @@ contract DODOV2Proxy01 is IDODOV2Proxy01, ReentrancyGuard, InitializableOwnable
         
         uint256 originToTokenBalance = IERC20(toToken).balanceOf(msg.sender);
         IWETH(_WETH_).deposit{value: msg.value}();
-        IWETH(_WETH_).transfer(dodoPairs[0], msg.value);
+        SafeERC20.safeTransfer(IERC20(_WETH_), dodoPairs[0], msg.value);
 
         for (uint256 i = 0; i < dodoPairs.length; i++) {
             if (i == dodoPairs.length - 1) {
diff --git a/contracts/SmartRoute/DODOV2Proxy02.sol b/contracts/SmartRoute/DODOV2Proxy02.sol
index bc0b91e..80e8df3 100644
--- a/contracts/SmartRoute/DODOV2Proxy02.sol
+++ b/contracts/SmartRoute/DODOV2Proxy02.sol
@@ -226,7 +226,7 @@ contract DODOV2Proxy02 is IDODOV2Proxy01, ReentrancyGuard, InitializableOwnable
         
         uint256 originToTokenBalance = IERC20(toToken).balanceOf(msg.sender);
         IWETH(_WETH_).deposit{value: msg.value}();
-        IWETH(_WETH_).transfer(dodoPairs[0], msg.value);
+        SafeERC20.safeTransfer(IERC20(_WETH_), dodoPairs[0], msg.value);
 
         for (uint256 i = 0; i < dodoPairs.length; i++) {
             if (i == dodoPairs.length - 1) {
diff --git a/contracts/SmartRoute/adapter/UniV3Adapter.sol b/contracts/SmartRoute/adapter/UniV3Adapter.sol
index 9979a7a..bd95dda 100644
--- a/contracts/SmartRoute/adapter/UniV3Adapter.sol
+++ b/contracts/SmartRoute/adapter/UniV3Adapter.sol
@@ -103,7 +103,7 @@ contract UniV3Adapter is IDODOAdapter, IUniswapV3SwapCallback, InitializableOwna
         if (token == _WETH_ && address(this).balance >= value) {
             // pay with WETH9
             IWETH(_WETH_).deposit{value: value}(); // wrap only what is needed to pay
-            IWETH(_WETH_).transfer(recipient, value);
+            SafeERC20.safeTransfer(IERC20(_WETH_), recipient, value);
         } else if (payer == address(this)) {
             // pay with tokens already in the contract (for the exact input multihop case)
             SafeERC20.safeTransfer(IERC20(token), recipient, value);