diff --git a/package.json b/package.json
index 370776c..7259964 100644
--- a/package.json
+++ b/package.json
@@ -14,7 +14,7 @@
   "devDependencies": {
     "batch": "^0.6.0",
     "blue-tape": "^1.0.0",
-    "mocha": "^3.3.0",
+    "mocha": "^4.1.0",
     "onchange": "^3.2.1",
     "should": "^11.2.1",
     "tap-spec": "^4.1.1",