diff --git a/contracts/StakeVault.sol b/contracts/StakeVault.sol
index e7f79c6..d29c801 100644
--- a/contracts/StakeVault.sol
+++ b/contracts/StakeVault.sol
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: MIT
 
-pragma solidity 0.8.18;
+pragma solidity ^0.8.18;
 
 import "./StakeManager.sol";
 import "@openzeppelin/contracts/access/Ownable.sol";
diff --git a/contracts/Token.sol b/contracts/Token.sol
index d7112ae..4bc760c 100644
--- a/contracts/Token.sol
+++ b/contracts/Token.sol
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: MIT
 
-pragma solidity 0.8.18;
+pragma solidity ^0.8.18;
 
 import "@openzeppelin/contracts/access/Ownable.sol";
 import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
diff --git a/contracts/legacy/Owned.sol b/contracts/legacy/Owned.sol
index 8854bc3..3299f10 100644
--- a/contracts/legacy/Owned.sol
+++ b/contracts/legacy/Owned.sol
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: GPL-3.0
-pragma solidity 0.8.18;
+pragma solidity ^0.8.18;
 /// @dev `Owned` is a base level contract that assigns an `owner` that can be
 ///  later changed
 contract Owned {
diff --git a/contracts/legacy/SNTFaucet.sol b/contracts/legacy/SNTFaucet.sol
index 31a0dc2..ce626d7 100644
--- a/contracts/legacy/SNTFaucet.sol
+++ b/contracts/legacy/SNTFaucet.sol
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: GPL-3.0
-pragma solidity 0.8.18;
+pragma solidity ^0.8.18;
 
 import "./SNTPlaceHolder.sol";
 
diff --git a/contracts/legacy/SNTPlaceHolder.sol b/contracts/legacy/SNTPlaceHolder.sol
index b07aa34..4ee4b19 100644
--- a/contracts/legacy/SNTPlaceHolder.sol
+++ b/contracts/legacy/SNTPlaceHolder.sol
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: GPL-3.0
-pragma solidity 0.8.18;
+pragma solidity ^0.8.18;
 import "./token/TokenController.sol";
 import "./token/MiniMeToken.sol";
 import "./SafeMath.sol";
diff --git a/contracts/legacy/SafeMath.sol b/contracts/legacy/SafeMath.sol
index d7b5466..4efe4b2 100644
--- a/contracts/legacy/SafeMath.sol
+++ b/contracts/legacy/SafeMath.sol
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: GPL-3.0
-pragma solidity 0.8.18;
+pragma solidity ^0.8.18;
 
 /**
  * Math operations with safety checks
diff --git a/contracts/legacy/optimism/OptimismMintableMiniMeToken.sol b/contracts/legacy/optimism/OptimismMintableMiniMeToken.sol
index c2e0c5b..501f891 100644
--- a/contracts/legacy/optimism/OptimismMintableMiniMeToken.sol
+++ b/contracts/legacy/optimism/OptimismMintableMiniMeToken.sol
@@ -1,7 +1,7 @@
 
 
 // SPDX-License-Identifier: MIT
-pragma solidity 0.8.18;
+pragma solidity ^0.8.18;
 
 import { MiniMeToken } from "../token/MiniMeToken.sol";
 import { IERC165 } from "@openzeppelin/contracts/utils/introspection/IERC165.sol";
diff --git a/contracts/legacy/token/ApproveAndCallFallBack.sol b/contracts/legacy/token/ApproveAndCallFallBack.sol
index 246efbe..651d1f4 100644
--- a/contracts/legacy/token/ApproveAndCallFallBack.sol
+++ b/contracts/legacy/token/ApproveAndCallFallBack.sol
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: GPL-3.0
-pragma solidity 0.8.18;
+pragma solidity ^0.8.18;
 abstract contract ApproveAndCallFallBack {
     function receiveApproval(address from, uint256 _amount, address _token, bytes memory _data) virtual public;
 }
diff --git a/contracts/legacy/token/Controlled.sol b/contracts/legacy/token/Controlled.sol
index 38b6109..0779344 100644
--- a/contracts/legacy/token/Controlled.sol
+++ b/contracts/legacy/token/Controlled.sol
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: GPL-3.0
-pragma solidity 0.8.18;
+pragma solidity ^0.8.18;
 
 contract Controlled {
     string internal constant ERR_BAD_PARAMETER = "Bad parameter";
diff --git a/contracts/legacy/token/MiniMeToken.sol b/contracts/legacy/token/MiniMeToken.sol
index 70cd1b9..c93f72c 100644
--- a/contracts/legacy/token/MiniMeToken.sol
+++ b/contracts/legacy/token/MiniMeToken.sol
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: GPL-3.0
-pragma solidity 0.8.18;
+pragma solidity ^0.8.18;
 /*
     Copyright 2016, Jordi Baylina
 
diff --git a/contracts/legacy/token/MiniMeTokenFactory.sol b/contracts/legacy/token/MiniMeTokenFactory.sol
index bb476a7..08aa9cc 100644
--- a/contracts/legacy/token/MiniMeTokenFactory.sol
+++ b/contracts/legacy/token/MiniMeTokenFactory.sol
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: GPL-3.0
-pragma solidity 0.8.18;
+pragma solidity ^0.8.18;
 import "./MiniMeToken.sol";
 
 ////////////////
diff --git a/contracts/legacy/token/TokenController.sol b/contracts/legacy/token/TokenController.sol
index f4868ec..6eb5e95 100644
--- a/contracts/legacy/token/TokenController.sol
+++ b/contracts/legacy/token/TokenController.sol
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: GPL-3.0
-pragma solidity 0.8.18;
+pragma solidity ^0.8.18;
 /**
  * @dev The token controller contract must implement these functions
  */