diff --git a/contracts/PoseidonHasher.sol b/contracts/PoseidonHasher.sol
index 91701c4..b3710cb 100644
--- a/contracts/PoseidonHasher.sol
+++ b/contracts/PoseidonHasher.sol
@@ -1,4 +1,4 @@
-pragma solidity 0.7.4;
+pragma solidity ^0.7.4;
 
 interface IPoseidonHasher {
 	function hash(uint256[2] memory input) external pure returns (uint256 result);
diff --git a/contracts/Rln.sol b/contracts/Rln.sol
index bd97416..9437a2d 100644
--- a/contracts/Rln.sol
+++ b/contracts/Rln.sol
@@ -1,4 +1,4 @@
-pragma solidity 0.7.4;
+pragma solidity ^0.7.4;
 
 import { IPoseidonHasher } from "./PoseidonHasher.sol";
 
diff --git a/contracts/RlnERC20.sol b/contracts/RlnERC20.sol
index c60fbad..3b75c59 100644
--- a/contracts/RlnERC20.sol
+++ b/contracts/RlnERC20.sol
@@ -1,4 +1,4 @@
-pragma solidity 0.7.4;
+pragma solidity ^0.7.4;
 
 import { IPoseidonHasher } from "./PoseidonHasher.sol";
 import "@openzeppelin/contracts/token/ERC20/ERC20.sol";