diff --git a/demo/app/contracts/simple_storage.sol b/demo/app/contracts/simple_storage.sol
index 955ad899..9872d778 100644
--- a/demo/app/contracts/simple_storage.sol
+++ b/demo/app/contracts/simple_storage.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.4.7;
+pragma solidity ^0.4.18;
 contract SimpleStorage {
   uint public storedData;
 
diff --git a/package.json b/package.json
index bd32be53..17d64be8 100644
--- a/package.json
+++ b/package.json
@@ -33,7 +33,7 @@
     "promptly": "^2.1.0",
     "serve-static": "^1.11.1",
     "shelljs": "^0.5.0",
-    "solc": "0.4.17",
+    "solc": "0.4.18",
     "tar": "^3.1.5",
     "toposort": "^1.0.0",
     "underscore": "^1.8.3",
diff --git a/test_app/app/contracts/another_storage.sol b/test_app/app/contracts/another_storage.sol
index 6bad7106..d8e0a1a8 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 ^0.4.18;
 contract AnotherStorage {
   address public simpleStorageAddress;
   address simpleStorageAddress2;
diff --git a/test_app/app/contracts/ownable.sol b/test_app/app/contracts/ownable.sol
index 0e2562c0..097df995 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 ^0.4.18;
 
 /**
  * @title Ownable
diff --git a/test_app/app/contracts/simple_storage.sol b/test_app/app/contracts/simple_storage.sol
index 4098c6f0..2682a7e4 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 ^0.4.18;
 
 import "ownable.sol";
 
diff --git a/test_app/app/contracts/test.sol b/test_app/app/contracts/test.sol
index 20070e0b..f1523673 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 ^0.4.18;
 
 library ZAMyLib {
 
diff --git a/test_app/app/contracts/token.sol b/test_app/app/contracts/token.sol
index 98c9bd49..fc92206a 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 ^0.4.18;
 contract Token {
 
   event Transfer(address indexed from, address indexed to, uint value);
diff --git a/test_app/config/contracts.json b/test_app/config/contracts.json
index d2a7e2b3..d5e24c97 100644
--- a/test_app/config/contracts.json
+++ b/test_app/config/contracts.json
@@ -2,7 +2,7 @@
   "default": {
     "versions": {
       "web3.js": "1.0.0-beta",
-      "solc": "0.4.17"
+      "solc": "0.4.18"
     },
     "deployment": {
       "host": "localhost",