diff --git a/package.json b/package.json
index 0228c18..2cce27b 100644
--- a/package.json
+++ b/package.json
@@ -36,10 +36,10 @@
   },
 
   "devDependencies": {
-    "sinon-chai": "2.6.0",
-    "chai":       "1.10.0",
-    "mocha":      "2.0.1",
-    "sinon":      "1.12.1"
+    "sinon-chai": "2.7.0",
+    "chai":       "2.2.0",
+    "mocha":      "2.2.1",
+    "sinon":      "1.14.1"
   },
 
   "dependencies": {