diff --git a/package.json b/package.json
index 56e2bfa..96a55b0 100644
--- a/package.json
+++ b/package.json
@@ -23,9 +23,9 @@
   },
   "devDependencies": {
     "minami": "^1.2.3",
-    "grunt": "^0.4.5",
-    "grunt-contrib-concat": "^0.5.1",
-    "grunt-contrib-clean": "0.6.0",
-    "grunt-contrib-uglify": "^0.9.1"
+    "grunt": ">=1.3.0",
+    "grunt-contrib-concat": ">=0.5.1",
+    "grunt-contrib-clean": ">=0.6.0",
+    "grunt-contrib-uglify": ">=0.9.1"
   }
 }