diff --git a/.gitignore b/.gitignore
index ffaf7e02..2a3952cd 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,6 +11,8 @@ dist
 cache
 artifacts
 typechain-types
+out
+cache_forge
 
 contracts/hardhat-dependency-compiler
 
diff --git a/contracts/carbon/Strategies.sol b/contracts/carbon/Strategies.sol
index 9dda945a..8d1e1f28 100644
--- a/contracts/carbon/Strategies.sol
+++ b/contracts/carbon/Strategies.sol
@@ -2,8 +2,9 @@
 pragma solidity 0.8.19;
 import { Initializable } from "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
 import { EnumerableSetUpgradeable } from "@openzeppelin/contracts-upgradeable/utils/structs/EnumerableSetUpgradeable.sol";
-import { MathUpgradeable } from "@openzeppelin/contracts-upgradeable/utils/math/MathUpgradeable.sol";
-import { SafeCastUpgradeable } from "@openzeppelin/contracts-upgradeable/utils/math/SafeCastUpgradeable.sol";
+import { Math } from "@openzeppelin/contracts/utils/math/Math.sol";
+import { SafeMath } from "@openzeppelin/contracts/utils/math/SafeMath.sol";
+import { SafeCast } from "@openzeppelin/contracts/utils/math/SafeCast.sol";
 import { Address } from "@openzeppelin/contracts/utils/Address.sol";
 import { MathEx } from "../utility/MathEx.sol";
 import { InvalidIndices } from "../utility/Utils.sol";
@@ -126,8 +127,7 @@ uint8 constant STRATEGY_UPDATE_REASON_TRADE = 1;
 abstract contract Strategies is Initializable {
     using EnumerableSetUpgradeable for EnumerableSetUpgradeable.UintSet;
     using Address for address payable;
-    using MathUpgradeable for uint256;
-    using SafeCastUpgradeable for uint256;
+    using SafeCast for uint256;
 
     error NativeAmountMismatch();
     error BalanceMismatch();
@@ -774,11 +774,16 @@ abstract contract Strategies is Initializable {
 
         uint256 factor1 = MathEx.minFactor(temp1, temp1);
         uint256 factor2 = MathEx.minFactor(temp3, A);
-        uint256 factor = MathUpgradeable.max(factor1, factor2);
+        uint256 factor = Math.max(factor1, factor2);
 
         uint256 temp4 = MathEx.mulDivC(temp1, temp1, factor);
         uint256 temp5 = MathEx.mulDivC(temp3, A, factor);
-        return MathEx.mulDivF(temp2, temp3 / factor, temp4 + temp5);
+
+        (bool safe, uint256 sum) = SafeMath.tryAdd(temp4, temp5);
+        if (safe) {
+            return MathEx.mulDivF(temp2, temp3 / factor, sum);
+        }
+        return temp2 / (A + MathEx.mulDivC(temp1, temp1, temp3));
     }
 
     /**
@@ -813,7 +818,7 @@ abstract contract Strategies is Initializable {
 
         uint256 factor1 = MathEx.minFactor(temp1, temp1);
         uint256 factor2 = MathEx.minFactor(temp2, temp3);
-        uint256 factor = MathUpgradeable.max(factor1, factor2);
+        uint256 factor = Math.max(factor1, factor2);
 
         uint256 temp4 = MathEx.mulDivC(temp1, temp1, factor);
         uint256 temp5 = MathEx.mulDivF(temp2, temp3, factor);
diff --git a/test/carbon/accuracy/data/ExtremeSrcTrade.json b/test/carbon/accuracy/data/ExtremeSrcTrade.json
index 70b2ef41..3af32c42 100644
--- a/test/carbon/accuracy/data/ExtremeSrcTrade.json
+++ b/test/carbon/accuracy/data/ExtremeSrcTrade.json
@@ -5108,5 +5108,15 @@
     "inputAmount": "912345678",
     "implReturn": "11263526807791440437174508207861",
     "specReturn": "11263526807791494477914130651426"
+  },
+  {
+    "liquidity": "969467735247045389207437",
+    "lowestRate": "33333333333333.01391180980424255864136284799315035343170166015625",
+    "highestRate": "198019801980197.408654344705869476683801622129976749420166015625",
+    "marginalRate": "104452559155538.8882958589671163947507815520699425817338168004935",
+    "tradeBy": "SourceAmount",
+    "inputAmount": "15120357940",
+    "implReturn": "924248818871126217204242",
+    "specReturn": "924248818871128843570750.388118986304"
   }
 ]