diff --git a/lib/blockchain_double.js b/lib/blockchain_double.js
index <HASH>..<HASH> 100644
--- a/lib/blockchain_double.js
+++ b/lib/blockchain_double.js
@@ -40,7 +40,7 @@ const defaultOptions = {
   defaultTransactionGasLimit: "0x15f90",
   time: null,
   debug: false,
-  hardfork: "byzantium",
+  hardfork: "constantinople",
   allowUnlimitedContractSize: false
 };
Reset back to constantinople as default