diff --git a/contracts/HumanStandardToken.sol b/contracts/HumanStandardToken.sol
index 63620e7..8ab7a2c 100644
--- a/contracts/HumanStandardToken.sol
+++ b/contracts/HumanStandardToken.sol
@@ -10,7 +10,7 @@ Machine-based, rapid creation of many tokens would not necessarily need these ex
 3) Optional approveAndCall() functionality to notify a contract if an approval() has occurred.
 
 .*/
-pragma solidity ^0.4.4;
+pragma solidity ^0.4.6;
 
 import "./StandardToken.sol";
 
diff --git a/contracts/StandardToken.sol b/contracts/StandardToken.sol
index f82fdc3..c5dc557 100644
--- a/contracts/StandardToken.sol
+++ b/contracts/StandardToken.sol
@@ -7,7 +7,7 @@ If you deploy this, you won't have anything useful.
 Implements ERC 20 Token standard: https://github.com/ethereum/EIPs/issues/20
 .*/
 
-pragma solidity ^0.4.4;
+pragma solidity ^0.4.6;
 
 import "./Token.sol";
 
diff --git a/contracts/Token.sol b/contracts/Token.sol
index 2f40232..5530241 100644
--- a/contracts/Token.sol
+++ b/contracts/Token.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.4.4;
+pragma solidity ^0.4.6;
 
 contract Token {