diff --git a/package.json b/package.json
index dfecee7..9cf8660 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,7 @@
     "bitcore": "^0.11.7",
     "body-parser": "^1.17.2",
     "dotenv": "^4.0.0",
-    "ethereumjs-util": "^5.1.2",
+    "ethereumjs-util": "^6.0.0",
     "express": "^4.15.2",
     "readline-sync": "^1.4.7",
     "solc": "^0.4.11",