diff --git a/package.json b/package.json
index 8c0cf4b..2aece0d 100644
--- a/package.json
+++ b/package.json
@@ -50,6 +50,7 @@
     "eslint-config-airbnb": "^16.1.0",
     "eslint-plugin-import": "^2.12.0",
     "eslint-plugin-jsx-a11y": "^6.0.3",
-    "eslint-plugin-react": "^7.8.2"
+    "eslint-plugin-react": "^7.8.2",
+    "ethereumjs-util": "^5.2.0"
   }
 }