diff --git a/contracts/Bounty.sol b/contracts/Bounty.sol
index 529342e6b..73e9fe07d 100644
--- a/contracts/Bounty.sol
+++ b/contracts/Bounty.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.4.4;
+pragma solidity ^0.4.8;
 
 
 import './payment/PullPayment.sol';
diff --git a/contracts/DayLimit.sol b/contracts/DayLimit.sol
index 49be5f194..1a929491e 100644
--- a/contracts/DayLimit.sol
+++ b/contracts/DayLimit.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.4.4;
+pragma solidity ^0.4.8;
 
 
 import './ownership/Shareable.sol';
diff --git a/contracts/LimitBalance.sol b/contracts/LimitBalance.sol
index c03cb03e0..8d73eb9e9 100644
--- a/contracts/LimitBalance.sol
+++ b/contracts/LimitBalance.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.4.4;
+pragma solidity ^0.4.8;
 
 
 /**
diff --git a/contracts/MultisigWallet.sol b/contracts/MultisigWallet.sol
index 80f39cc3b..c8ed091c6 100644
--- a/contracts/MultisigWallet.sol
+++ b/contracts/MultisigWallet.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.4.4;
+pragma solidity ^0.4.8;
 
 
 import "./ownership/Multisig.sol";
diff --git a/contracts/SafeMath.sol b/contracts/SafeMath.sol
index c27833081..0022768d4 100644
--- a/contracts/SafeMath.sol
+++ b/contracts/SafeMath.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.4.4;
+pragma solidity ^0.4.8;
 
 
 /**
diff --git a/contracts/lifecycle/Killable.sol b/contracts/lifecycle/Killable.sol
index 7ec3e2b51..0a1367df8 100644
--- a/contracts/lifecycle/Killable.sol
+++ b/contracts/lifecycle/Killable.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.4.4;
+pragma solidity ^0.4.8;
 
 
 import "../ownership/Ownable.sol";
diff --git a/contracts/lifecycle/Migrations.sol b/contracts/lifecycle/Migrations.sol
index 8b981e774..6b1bb0ad4 100644
--- a/contracts/lifecycle/Migrations.sol
+++ b/contracts/lifecycle/Migrations.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.4.4;
+pragma solidity ^0.4.8;
 
 
 import '../ownership/Ownable.sol';
diff --git a/contracts/lifecycle/Pausable.sol b/contracts/lifecycle/Pausable.sol
index 384d91478..9ac044a7f 100644
--- a/contracts/lifecycle/Pausable.sol
+++ b/contracts/lifecycle/Pausable.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.4.4;
+pragma solidity ^0.4.8;
 
 
 import "../ownership/Ownable.sol";
diff --git a/contracts/ownership/DelayedClaimable.sol b/contracts/ownership/DelayedClaimable.sol
index 714d2783b..349400a6b 100644
--- a/contracts/ownership/DelayedClaimable.sol
+++ b/contracts/ownership/DelayedClaimable.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.4.4;
+pragma solidity ^0.4.8;
 
 
 import './Ownable.sol';
diff --git a/contracts/ownership/Multisig.sol b/contracts/ownership/Multisig.sol
index 561bfe0b4..b124b54dd 100644
--- a/contracts/ownership/Multisig.sol
+++ b/contracts/ownership/Multisig.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.4.4;
+pragma solidity ^0.4.8;
 
 
 /*
diff --git a/contracts/ownership/Ownable.sol b/contracts/ownership/Ownable.sol
index d2a702889..c8444c1d0 100644
--- a/contracts/ownership/Ownable.sol
+++ b/contracts/ownership/Ownable.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.4.4;
+pragma solidity ^0.4.8;
 
 
 /*
diff --git a/contracts/ownership/Shareable.sol b/contracts/ownership/Shareable.sol
index 57a6c21cd..12938f5b3 100644
--- a/contracts/ownership/Shareable.sol
+++ b/contracts/ownership/Shareable.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.4.4;
+pragma solidity ^0.4.8;
 
 
 /*
diff --git a/contracts/payment/PullPayment.sol b/contracts/payment/PullPayment.sol
index 1c907ce5f..7a5ce3f48 100644
--- a/contracts/payment/PullPayment.sol
+++ b/contracts/payment/PullPayment.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.4.4;
+pragma solidity ^0.4.8;
 
 
 /*
diff --git a/contracts/token/BasicToken.sol b/contracts/token/BasicToken.sol
index a5b4c3265..053ba899c 100644
--- a/contracts/token/BasicToken.sol
+++ b/contracts/token/BasicToken.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.4.4;
+pragma solidity ^0.4.8;
 
 
 import './ERC20Basic.sol';
diff --git a/contracts/token/CrowdsaleToken.sol b/contracts/token/CrowdsaleToken.sol
index 4ce6a0aa4..c10d08808 100644
--- a/contracts/token/CrowdsaleToken.sol
+++ b/contracts/token/CrowdsaleToken.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.4.4;
+pragma solidity ^0.4.8;
 
 
 import "./StandardToken.sol";
diff --git a/contracts/token/ERC20.sol b/contracts/token/ERC20.sol
index 4ac0bb1fb..e89c66caa 100644
--- a/contracts/token/ERC20.sol
+++ b/contracts/token/ERC20.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.4.4;
+pragma solidity ^0.4.8;
 
 
 /*
diff --git a/contracts/token/ERC20Basic.sol b/contracts/token/ERC20Basic.sol
index b42d457cc..809addebf 100644
--- a/contracts/token/ERC20Basic.sol
+++ b/contracts/token/ERC20Basic.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.4.4;
+pragma solidity ^0.4.8;
 
 
 /*
diff --git a/contracts/token/SimpleToken.sol b/contracts/token/SimpleToken.sol
index 8b59438ae..db9137ff3 100644
--- a/contracts/token/SimpleToken.sol
+++ b/contracts/token/SimpleToken.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.4.4;
+pragma solidity ^0.4.8;
 
 
 import "./StandardToken.sol";
diff --git a/contracts/token/StandardToken.sol b/contracts/token/StandardToken.sol
index b457808ee..c00985f86 100644
--- a/contracts/token/StandardToken.sol
+++ b/contracts/token/StandardToken.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.4.4;
+pragma solidity ^0.4.8;
 
 
 import './ERC20.sol';
diff --git a/test/helpers/BasicTokenMock.sol b/test/helpers/BasicTokenMock.sol
index 15be1a898..566dc330e 100644
--- a/test/helpers/BasicTokenMock.sol
+++ b/test/helpers/BasicTokenMock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.4.4;
+pragma solidity ^0.4.8;
 
 
 import '../../contracts/token/BasicToken.sol';
diff --git a/test/helpers/DayLimitMock.sol b/test/helpers/DayLimitMock.sol
index 338eea900..c65396da6 100644
--- a/test/helpers/DayLimitMock.sol
+++ b/test/helpers/DayLimitMock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.4.4;
+pragma solidity ^0.4.8;
 import "../../contracts/DayLimit.sol";
 
 contract DayLimitMock is DayLimit {
diff --git a/test/helpers/InsecureTargetBounty.sol b/test/helpers/InsecureTargetBounty.sol
index 1779884ae..cfce6b099 100644
--- a/test/helpers/InsecureTargetBounty.sol
+++ b/test/helpers/InsecureTargetBounty.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.4.4;
+pragma solidity ^0.4.8;
 
 
 import {Bounty, Target} from "../../contracts/Bounty.sol";
diff --git a/test/helpers/LimitBalanceMock.sol b/test/helpers/LimitBalanceMock.sol
index c579f731a..d2032d238 100644
--- a/test/helpers/LimitBalanceMock.sol
+++ b/test/helpers/LimitBalanceMock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.4.4;
+pragma solidity ^0.4.8;
 
 
 import '../../contracts/LimitBalance.sol';
diff --git a/test/helpers/MultisigWalletMock.sol b/test/helpers/MultisigWalletMock.sol
index ef663ce21..ae908de46 100644
--- a/test/helpers/MultisigWalletMock.sol
+++ b/test/helpers/MultisigWalletMock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.4.4;
+pragma solidity ^0.4.8;
 import "../../contracts/MultisigWallet.sol";
 
 contract MultisigWalletMock is MultisigWallet {
diff --git a/test/helpers/PausableMock.sol b/test/helpers/PausableMock.sol
index 316eaacbd..acf21c4e8 100644
--- a/test/helpers/PausableMock.sol
+++ b/test/helpers/PausableMock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.4.4;
+pragma solidity ^0.4.8;
 
 
 import '../../contracts/lifecycle/Pausable.sol';
diff --git a/test/helpers/PullPaymentMock.sol b/test/helpers/PullPaymentMock.sol
index e10b27397..7c4bdb913 100644
--- a/test/helpers/PullPaymentMock.sol
+++ b/test/helpers/PullPaymentMock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.4.4;
+pragma solidity ^0.4.8;
 
 
 import '../../contracts/payment/PullPayment.sol';
diff --git a/test/helpers/SafeMathMock.sol b/test/helpers/SafeMathMock.sol
index 46d782a4f..e31aefbef 100644
--- a/test/helpers/SafeMathMock.sol
+++ b/test/helpers/SafeMathMock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.4.4;
+pragma solidity ^0.4.8;
 
 
 import '../../contracts/SafeMath.sol';
diff --git a/test/helpers/SecureTargetBounty.sol b/test/helpers/SecureTargetBounty.sol
index 50488a354..2a46e3145 100644
--- a/test/helpers/SecureTargetBounty.sol
+++ b/test/helpers/SecureTargetBounty.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.4.4;
+pragma solidity ^0.4.8;
 
 
 import {Bounty, Target} from "../../contracts/Bounty.sol";
diff --git a/test/helpers/ShareableMock.sol b/test/helpers/ShareableMock.sol
index 1899bbe1d..8a2ab990e 100644
--- a/test/helpers/ShareableMock.sol
+++ b/test/helpers/ShareableMock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.4.4;
+pragma solidity ^0.4.8;
 import "../../contracts/ownership/Shareable.sol";
 
 contract ShareableMock is Shareable {
diff --git a/test/helpers/StandardTokenMock.sol b/test/helpers/StandardTokenMock.sol
index 9a05a6859..602aac0bc 100644
--- a/test/helpers/StandardTokenMock.sol
+++ b/test/helpers/StandardTokenMock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.4.4;
+pragma solidity ^0.4.8;
 
 
 import '../../contracts/token/StandardToken.sol';
diff --git a/test/helpers/VestedTokenMock.sol b/test/helpers/VestedTokenMock.sol
index af6ceef5b..311692e72 100644
--- a/test/helpers/VestedTokenMock.sol
+++ b/test/helpers/VestedTokenMock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.4.4;
+pragma solidity ^0.4.8;
 
 import '../../contracts/token/VestedToken.sol';