diff --git a/contracts/deploy/DelegatedCall.sol b/contracts/deploy/DelegatedCall.sol
index 0526c76..861f751 100644
--- a/contracts/deploy/DelegatedCall.sol
+++ b/contracts/deploy/DelegatedCall.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.4.17;
+pragma solidity ^0.4.21;
 
 
 /**
@@ -29,7 +29,7 @@ contract DelegatedCall {
      */
     function targetDelegatedCall()
         internal
-        constant
+        view
         returns(address);
 
 }
diff --git a/contracts/deploy/Instance.sol b/contracts/deploy/Instance.sol
index 96c18d8..6243711 100644
--- a/contracts/deploy/Instance.sol
+++ b/contracts/deploy/Instance.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.4.17;
+pragma solidity ^0.4.21;
 
 import "./InstanceStorage.sol";
 import "./DelegatedCall.sol";
@@ -28,7 +28,7 @@ contract Instance is InstanceStorage, DelegatedCall {
      */
     function targetDelegatedCall()
         internal
-        constant
+        view
         returns(address)
     {
         return kernel;