diff --git a/package.json b/package.json
index 6942b53..a478005 100644
--- a/package.json
+++ b/package.json
@@ -18,10 +18,10 @@
     "url": "https://github.com/sofish/pen/blob/master/license.txt"
   },
   "devDependencies": {
-    "grunt": "~0.4.1",
-    "grunt-contrib-jshint": "~0.7.2",
-    "grunt-contrib-uglify": "~0.2.7",
-    "grunt-contrib-watch": "~0.5.3"
+    "grunt": "~1.0.1",
+    "grunt-contrib-jshint": "~1.0.0",
+    "grunt-contrib-uglify": "~2.0.0",
+    "grunt-contrib-watch": "~1.0.0"
   },
   "scripts": {
     "test": "grunt --verbose"