diff --git a/lib/filter.js b/lib/filter.js
index 93abf19..0e8f76d 100644
--- a/lib/filter.js
+++ b/lib/filter.js
@@ -1,12 +1,8 @@
 /* global hexo */
 'use strict'
 var CleanCSS = require('clean-css')
-
 var UglifyJS = require('uglify-js')
-
 var Htmlminifier = require('html-minifier').minify
-
-var streamToArray = require('stream-to-array')
 var Promise = require('bluebird')
 var minimatch = require('minimatch')
 var zlib = require('zlib')
diff --git a/package.json b/package.json
index d725f08..59cf96d 100644
--- a/package.json
+++ b/package.json
@@ -24,7 +24,6 @@
     "iltorb": "^2.4.0",
     "minimatch": "^3.0.4",
     "object-assign": "^4.1.1",
-    "stream-to-array": "^2.3.0",
     "uglify-js": "^3.4.9"
   },
   "keywords": [