Defensive end-of-line closed of dep intervals.

bower.json

@@ -28,7 +28,7 @@
   },
   "devDependencies": {
     "amber-ide-starter-dialog": "^0.1.0",
-    "amber-contrib-legacy": ">=0.3.0",
-    "helios": ">=0.6.0"
+    "amber-contrib-legacy": ">=0.3.0 <0.5.0",
+    "helios": ">=0.6.0 <0.8.0"
   }
 }