diff --git a/package.json b/package.json
index 4f63c43..3539f62 100644
--- a/package.json
+++ b/package.json
@@ -18,7 +18,7 @@
     "./lib/aesprim.js": "./generated/aesprim-browser.js"
   },
   "devDependencies": {
-    "grunt": "0.4.5",
+    "grunt": "1.5.3",
     "grunt-browserify": "3.8.0",
     "grunt-cli": "0.1.13",
     "grunt-contrib-uglify": "0.9.1",