diff --git a/test/integration/projects/solc-6/buidler.config.js b/test/integration/projects/solc-6/buidler.config.js
index e9183c8..d734848 100644
--- a/test/integration/projects/solc-6/buidler.config.js
+++ b/test/integration/projects/solc-6/buidler.config.js
@@ -5,6 +5,6 @@ usePlugin("@nomiclabs/buidler-truffle5");
 module.exports={
   defaultNetwork: "buidlerevm",
   solc: {
-    version: "0.6.2"
+    version: "0.6.5"
   }
 };
diff --git a/test/integration/projects/solc-6/contracts/ContractA.sol b/test/integration/projects/solc-6/contracts/ContractA.sol
index fa2bec2..c490583 100644
--- a/test/integration/projects/solc-6/contracts/ContractA.sol
+++ b/test/integration/projects/solc-6/contracts/ContractA.sol
@@ -9,6 +9,9 @@ contract ContractA is ContractB {
   uint counter;
   uint errorCount;
 
+  uint private immutable _a = 100;
+  uint private immutable override _b = 100;
+
   modifier overridden() override {
     require(true);
     _;
diff --git a/test/integration/projects/solc-6/contracts/ContractB.sol b/test/integration/projects/solc-6/contracts/ContractB.sol
index 5dd0b63..a56dbbc 100644
--- a/test/integration/projects/solc-6/contracts/ContractB.sol
+++ b/test/integration/projects/solc-6/contracts/ContractB.sol
@@ -3,6 +3,7 @@ pragma solidity ^0.6.0;
 
 contract ContractB {
   uint value;
+  uint b;
 
   constructor() public {
   }