diff --git a/package.json b/package.json
index 4841aa4..944ef11 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,7 @@
   "main": "index.js",
   "dependencies": {
     "bn.js": "^4.10.0",
-    "ethereumjs-util": "^4.3.0"
+    "ethereumjs-util": "^5.0.0"
   },
   "devDependencies": {
     "coveralls": "^2.11.4",