diff --git a/package.json b/package.json
index ee73c7e..030ac6b 100644
--- a/package.json
+++ b/package.json
@@ -29,10 +29,10 @@
     "request": "^2.53.0"
   },
   "devDependencies": {
-    "chai": "^1.10.0",
+    "chai": "^3.5.0",
     "coveralls": "^2.11.2",
-    "istanbul": "^0.3.5",
-    "mocha": "^2.1.0",
+    "istanbul": "^0.4.5",
+    "mocha": "^3.2.0",
     "sinon": "^1.12.2"
   }
 }