diff --git a/package.json b/package.json
index 448a8fd..740a209 100644
--- a/package.json
+++ b/package.json
@@ -37,7 +37,7 @@
   "devDependencies": {
     "mocha": "^3.0.2",
     "chai": "^3.5.0",
-    "chai-as-promised": "^5.3.0",
+    "chai-as-promised": "^6.0.0",
     "jshint": "^2.9.3",
     "istanbul": "^0.4.5",
     "coveralls": "^2.11.12",