diff --git a/package.json b/package.json
index 82dcc08..5d1fda0 100644
--- a/package.json
+++ b/package.json
@@ -11,12 +11,12 @@
     "start": "webpack-dev-server --progress --profile --colors --watch --display-error-details --display-cached --content-base dev/"
   },
   "peerDependencies": {
+    "chart.js": ">= 2 < 3",
     "@angular/common": ">=4.0.0 || ^2.0.0",
     "@angular/compiler": ">=4.0.0 || ^2.0.0",
     "@angular/core": ">=4.0.0 || ^2.0.0"
   },
   "dependencies": {
-    "chart.js": "^2.3.0"
   },
   "author": "Chen, Yi-Cyuan <emn178@gmail.com>",
   "license": "MIT",