diff --git a/src/contracts/core/AllocationManager.sol b/src/contracts/core/AllocationManager.sol
index 9dbe529fd..2b01d9d54 100644
--- a/src/contracts/core/AllocationManager.sol
+++ b/src/contracts/core/AllocationManager.sol
@@ -4,9 +4,9 @@ pragma solidity ^0.8.27;
 import "@openzeppelin-upgrades/contracts/proxy/utils/Initializable.sol";
 import "@openzeppelin-upgrades/contracts/access/OwnableUpgradeable.sol";
 import "@openzeppelin-upgrades/contracts/security/ReentrancyGuardUpgradeable.sol";
+import "@openzeppelin-upgrades/contracts/utils/cryptography/SignatureCheckerUpgradeable.sol";
 
 import "../permissions/Pausable.sol";
-import "../libraries/EIP1271SignatureUtils.sol";
 import "../libraries/SlashingLib.sol";
 import "./AllocationManagerStorage.sol";
 
@@ -647,7 +647,7 @@ contract AllocationManager is
         );
 
         // Assert operator's signature is valid.
-        EIP1271SignatureUtils.checkSignature_EIP1271(operator, digestHash, operatorSignature.signature);
+        SignatureCheckerUpgradeable.isValidERC1271SignatureNow(operator, digestHash, operatorSignature.signature);
         // Spend salt.
         operatorSaltIsSpent[operator][operatorSignature.salt] = true;
     }