diff --git a/test_apps/contracts_app/contracts.json b/test_apps/contracts_app/contracts.json
index d4112a28..2b0dfc59 100644
--- a/test_apps/contracts_app/contracts.json
+++ b/test_apps/contracts_app/contracts.json
@@ -2,7 +2,7 @@
   "default": {
     "versions": {
       "web3": "1.0.0-beta.27",
-      "solc": "0.4.17"
+      "solc": "0.4.24"
     },
     "deployment": {
       "host": "localhost",
diff --git a/test_apps/contracts_app/contracts/another_storage.sol b/test_apps/contracts_app/contracts/another_storage.sol
index 92233769..2bf83d1d 100644
--- a/test_apps/contracts_app/contracts/another_storage.sol
+++ b/test_apps/contracts_app/contracts/another_storage.sol
@@ -1,9 +1,9 @@
-pragma solidity ^0.4.17;
+pragma solidity ^0.4.24;
 contract AnotherStorage {
   address public simpleStorageAddress;
   address simpleStorageAddress2;
 
-  function AnotherStorage(address addr) public {
+  constructor(address addr) public {
     simpleStorageAddress = addr;
   }
 
diff --git a/test_apps/contracts_app/contracts/contract_args.sol b/test_apps/contracts_app/contracts/contract_args.sol
index 1bf7a2d3..a1019181 100644
--- a/test_apps/contracts_app/contracts/contract_args.sol
+++ b/test_apps/contracts_app/contracts/contract_args.sol
@@ -1,3 +1,5 @@
+pragma solidity ^0.4.24;
+
 contract ContractArgs {
   address public addr_1;
   address public addr_2;
@@ -5,7 +7,7 @@ contract ContractArgs {
 
   function() public payable { }
 
-  function ContractArgs(address[] _addresses, uint initialValue) public {
+  constructor(address[] _addresses, uint initialValue) public {
     addr_1 = _addresses[0];
     addr_2 = _addresses[1];
     value = initialValue;
diff --git a/test_apps/contracts_app/contracts/ownable.sol b/test_apps/contracts_app/contracts/ownable.sol
index af8aa0cf..3725007c 100644
--- a/test_apps/contracts_app/contracts/ownable.sol
+++ b/test_apps/contracts_app/contracts/ownable.sol
@@ -13,7 +13,7 @@ contract Ownable {
    * @dev The Ownable constructor sets the original `owner` of the contract to the sender
    * account.
    */
-  function Ownable() public {
+  constructor() public {
     owner = msg.sender;
   }
 
diff --git a/test_apps/contracts_app/contracts/simple_storage.sol b/test_apps/contracts_app/contracts/simple_storage.sol
index c72e8e98..333c03ff 100644
--- a/test_apps/contracts_app/contracts/simple_storage.sol
+++ b/test_apps/contracts_app/contracts/simple_storage.sol
@@ -6,7 +6,7 @@ library Assert {
   event TestEvent(bool passed, string message);
 
   function triggerEvent(bool passed, string message) internal {
-    TestEvent(passed, message);
+    emit TestEvent(passed, message);
   }
 }
 
@@ -15,7 +15,7 @@ contract SimpleStorage is Ownable {
 
   function() public payable { }
 
-  function SimpleStorage(uint initialValue) public {
+  constructor(uint initialValue) public {
     storedData = initialValue;
   }
 
@@ -27,7 +27,7 @@ contract SimpleStorage is Ownable {
     Assert.triggerEvent(true, "hi");
   }
 
-  function set2(uint x, uint unusedGiveWarning) public onlyOwner {
+  function set2(uint x) public onlyOwner {
     storedData = x;
   }
 
diff --git a/test_apps/contracts_app/contracts/some_contract.sol b/test_apps/contracts_app/contracts/some_contract.sol
index fa69a88b..9297cfae 100644
--- a/test_apps/contracts_app/contracts/some_contract.sol
+++ b/test_apps/contracts_app/contracts/some_contract.sol
@@ -1,3 +1,5 @@
+pragma solidity ^0.4.24;
+
 contract SomeContract {
   address public addr_1;
   address public addr_2;
@@ -5,7 +7,7 @@ contract SomeContract {
 
   function() public payable { }
 
-  function SomeContract(address[] _addresses, uint initialValue) public {
+  constructor(address[] _addresses, uint initialValue) public {
     addr_1 = _addresses[0];
     addr_2 = _addresses[1];
     value = initialValue;
diff --git a/test_apps/contracts_app/contracts/token.sol b/test_apps/contracts_app/contracts/token.sol
index 32b1dafd..39584bca 100644
--- a/test_apps/contracts_app/contracts/token.sol
+++ b/test_apps/contracts_app/contracts/token.sol
@@ -10,7 +10,7 @@ contract Token {
   mapping( address => mapping( address => uint ) ) _approvals;
   uint public _supply;
   //uint public _supply2;
-  function Token( uint initial_balance ) public {
+  constructor( uint initial_balance ) public {
     _balances[msg.sender] = initial_balance;
     _supply = initial_balance;
   }
@@ -29,7 +29,7 @@ contract Token {
     }
     _balances[msg.sender] -= value;
     _balances[to] += value;
-    Transfer( msg.sender, to, value );
+    emit Transfer( msg.sender, to, value );
     return true;
   }
   function transferFrom( address from, address to, uint value) public returns (bool ok) {
@@ -48,13 +48,13 @@ contract Token {
     _approvals[from][msg.sender] -= value;
     _balances[from] -= value;
     _balances[to] += value;
-    Transfer( from, to, value );
+    emit Transfer( from, to, value );
     return true;
   }
   function approve(address spender, uint value) public returns (bool ok) {
     // TODO: should increase instead
     _approvals[msg.sender][spender] = value;
-    Approval( msg.sender, spender, value );
+    emit Approval( msg.sender, spender, value );
     return true;
   }
   function allowance(address owner, address spender) public constant returns (uint _allowance) {