diff --git a/README.md b/README.md
index fc7fd66..743ec76 100644
--- a/README.md
+++ b/README.md
@@ -16,22 +16,12 @@ arrayToSentenceJa(['春', '夏', '秋', '冬']); //=> '春、夏、秋および
 
 ## Installation
 
-#### [npm](https://www.npmjs.com/)
+[Use](https://docs.npmjs.com/cli/install) [npm](https://docs.npmjs.com/getting-started/what-is-npm).
 
 ```
 npm install array-to-sentence-ja
 ```
 
-#### [Bower](http://bower.io/)
-
-```
-bower install array-to-sentence-ja
-```
-
-### Standalone
-
-[Download the script file directly.](https://raw.githubusercontent.com/shinnn/array-to-sentence-ja/master/browser.js)
-
 ## API
 
 ### arrayToSentenceJa(*array* [, *options*])
diff --git a/bower.json b/bower.json
deleted file mode 100644
index dd148eb..0000000
--- a/bower.json
+++ /dev/null
@@ -1,41 +0,0 @@
-{
-  "name": "array-to-sentence-ja",
-  "description": "Japanese-friendly version of array-to-sentence",
-  "keywords": [
-    "to-sentence",
-    "sentence",
-    "array",
-    "join",
-    "human",
-    "readable",
-    "string",
-    "separator",
-    "comma",
-    "and",
-    "natural-language",
-    "ja",
-    "japanese"
-  ],
-  "main": "browser.js",
-  "moduleType": "globals",
-  "homepage": "https://github.com/shinnn/array-to-sentence-ja",
-  "repository": {
-    "type": "git",
-    "url": "git://github.com/shinnn/array-to-sentence-ja.git"
-  },
-  "authors": [
-    "Shinnosuke Watanabe (https://github.com/shinnn)"
-  ],
-  "license": "ISC",
-  "dependencies": {
-    "array-to-sentence": "^1.1.0"
-  },
-  "ignore": [
-    "**/.*",
-    "*.js",
-    "*.json",
-    "*.yml",
-    "coverage",
-    "node_modules"
-  ]
-}
diff --git a/package.json b/package.json
index 44a7540..eeb65b5 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,7 @@
   "repository": "shinnn/array-to-sentence-ja",
   "author": "Shinnosuke Watanabe (https://github.com/shinnn)",
   "scripts": {
-    "pretest": "bower install --production && eslint --fix --config @shinnn --ignore-path .gitignore .",
+    "pretest": "eslint --fix --config @shinnn --ignore-path .gitignore .",
     "test": "node --throw-deprecation --track-heap-objects test.js | tap-spec",
     "coverage": "istanbul cover -x=bower_components/array-to-sentence/* test.js"
   },
@@ -38,10 +38,8 @@
   },
   "devDependencies": {
     "@shinnn/eslint-config": "^3.0.2",
-    "bower": "^1.7.9",
     "eslint": "^3.4.0",
     "istanbul": "^0.4.5",
-    "require-bower-files": "^3.0.0",
     "require-from-string": "^1.2.0",
     "rollup": "^0.34.13",
     "rollup-plugin-node-resolve": "^2.0.0",
diff --git a/test.js b/test.js
index 8698876..69d3e31 100644
--- a/test.js
+++ b/test.js
@@ -1,14 +1,10 @@
 'use strict';
 
-const requireBowerFiles = require('require-bower-files');
 const requireFromString = require('require-from-string');
 const {rollup} = require('rollup');
 const rollupNodeResolve = require('rollup-plugin-node-resolve');
 const test = require('tape');
 
-global.window = {};
-requireBowerFiles({self: true});
-
 function runTest(arrayToSentenceJa, description) {
   test(description, t => {
     t.strictEqual(arrayToSentenceJa.name, 'arrayToSentenceJa', 'should have a function name.');
@@ -55,6 +51,5 @@ rollup({
   plugins: rollupNodeResolve({jsnext: true})
 }).then(bundle => {
   runTest(require('.'), 'require(\'array-to-sentence-ja\')');
-  runTest(global.window.arrayToSentenceJa, 'window.arrayToSentenceJa');
   runTest(requireFromString(bundle.generate({format: 'cjs'}).code), 'Module exports');
 });