diff --git a/test_app/app/contracts/another_storage.sol b/test_app/app/contracts/another_storage.sol
index 6bad71066..92233769b 100644
--- a/test_app/app/contracts/another_storage.sol
+++ b/test_app/app/contracts/another_storage.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.4.11;
+pragma solidity ^0.4.17;
 contract AnotherStorage {
   address public simpleStorageAddress;
   address simpleStorageAddress2;
diff --git a/test_app/app/contracts/ownable.sol b/test_app/app/contracts/ownable.sol
index 0e2562c04..af8aa0cfc 100644
--- a/test_app/app/contracts/ownable.sol
+++ b/test_app/app/contracts/ownable.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.4.11;
+pragma solidity ^0.4.17;
 
 /**
  * @title Ownable
diff --git a/test_app/app/contracts/simple_storage.sol b/test_app/app/contracts/simple_storage.sol
index 4098c6f07..58c90a356 100644
--- a/test_app/app/contracts/simple_storage.sol
+++ b/test_app/app/contracts/simple_storage.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.4.7;
+pragma solidity ^0.4.17;
 
 import "ownable.sol";
 
diff --git a/test_app/app/contracts/test.sol b/test_app/app/contracts/test.sol
index 20070e0b9..3d347f3fd 100644
--- a/test_app/app/contracts/test.sol
+++ b/test_app/app/contracts/test.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.4.11;
+pragma solidity ^0.4.17;
 
 library ZAMyLib {
 
diff --git a/test_app/app/contracts/token.sol b/test_app/app/contracts/token.sol
index 98c9bd49c..32b1dafdc 100644
--- a/test_app/app/contracts/token.sol
+++ b/test_app/app/contracts/token.sol
@@ -1,6 +1,6 @@
 // https://github.com/nexusdev/erc20/blob/master/contracts/base.sol
 
-pragma solidity ^0.4.2;
+pragma solidity ^0.4.17;
 contract Token {
 
   event Transfer(address indexed from, address indexed to, uint value);