diff --git a/package.json b/package.json
index 56de257bf7..7f902716ec 100644
--- a/package.json
+++ b/package.json
@@ -47,5 +47,8 @@
     "remix-solidity": "latest",
     "standard": "^10.0.3",
     "web3": "1.0.0-beta.27"
+  },
+  "devDependencies": {
+    "mocha": "^5.1.0"
   }
 }