diff --git a/package.json.in b/package.json.in
index def2f71..5959465 100644
--- a/package.json.in
+++ b/package.json.in
@@ -19,10 +19,11 @@
     "easejs": "0.2.x"
   },
   "devDependencies": {
-    "chai":   ">=1.9.1",
-    "mocha":  ">=1.18.2",
-    "sinon":  ">=1.17.4",
-    "es6-promise": "~3"
+    "chai":             ">=1.9.1",
+    "chai-as-promised": ">=6.0.0",
+    "mocha":            ">=1.18.2",
+    "sinon":            ">=1.17.4",
+    "es6-promise":      "~3"
   },
 
   "licenses": [