diff --git a/karma.conf.js b/karma.conf.js
index 7fdf3e0..e09663a 100644
--- a/karma.conf.js
+++ b/karma.conf.js
@@ -1,5 +1,14 @@
 const webpackCfg = require('./script/webpack.dev')
 webpackCfg.devtool = 'inline-source-map'
+webpackCfg.module.loaders.push({
+  test: /\.js$/,
+  exclude: /node_modules|lib\/util\.js/,
+  loader: 'istanbul-instrumenter-loader',
+  enforce: 'post',
+  options: {
+    esModules: true
+  }
+})
 
 module.exports = function(config) {
   config.set({
@@ -27,24 +36,21 @@ module.exports = function(config) {
       'karma-jasmine',
       'karma-jquery',
       'karma-chrome-launcher',
-      'karma-coverage',
       'karma-webpack',
       'karma-sourcemap-loader',
-      'karma-sourcemap-writer'
+      'karma-coverage-istanbul-reporter'
     ],
     webpackServer: {
       noInfo: true
     },
     preprocessors: {
-      'src/index.js': ['webpack', 'sourcemap', 'sourcemap-writer', 'coverage']
+      'src/index.js': ['webpack', 'sourcemap']
     },
     webpack: webpackCfg,
-    coverageReporter: {
-      type: 'json',
-      subdir: '.',
-      file: 'coverage-final.json'
+    coverageIstanbulReporter: {
+      reports: ['html', 'lcovonly', 'text', 'text-summary']
     },
-    reporters: ['progress', 'coverage'],
+    reporters: ['progress', 'coverage-istanbul'],
     port: 9876,
     colors: true,
     logLevel: config.LOG_INFO,
diff --git a/package.json b/package.json
index 12d4f04..eb89615 100644
--- a/package.json
+++ b/package.json
@@ -8,7 +8,7 @@
     "build": "webpack --config script/webpack.release.js && node script/build && shx cp README.md dist",
     "build:analyser": "webpack --config script/webpack.analyser.js",
     "dev": "webpack-dev-server --config script/webpack.dev.js --host 0.0.0.0",
-    "test": "karma start && remap-istanbul -i coverage/coverage-final.json -o coverage/coverage-remapped.json -t json && node script/coverage && shx rm src/index.js.map",
+    "test": "karma start",
     "format": "prettier *.js eustia/*.js src/**/*.{js,scss,css} script/*.js test/*.{js,html} --write",
     "lint": "eslint src/**/*.js",
     "lint:fix": "npm run lint -- --fix",
@@ -48,7 +48,7 @@
     "handlebars-loader": "^1.7.1",
     "html-minifier": "^4.0.0",
     "html-minifier-loader": "^1.4.1",
-    "istanbul": "^0.4.5",
+    "istanbul-instrumenter-loader": "^3.0.1",
     "jasmine-core": "^2.8.0",
     "jasmine-jquery": "^2.1.1",
     "jquery": "^3.4.1",
@@ -56,11 +56,10 @@
     "json-loader": "^0.5.7",
     "karma": "^4.4.1",
     "karma-chrome-launcher": "^3.1.0",
-    "karma-coverage": "^1.1.1",
+    "karma-coverage-istanbul-reporter": "^2.1.1",
     "karma-jasmine": "^1.1.1",
     "karma-jquery": "^0.2.4",
     "karma-sourcemap-loader": "^0.3.7",
-    "karma-sourcemap-writer": "^0.1.2",
     "karma-webpack": "^2.0.6",
     "licia": "^1.9.0",
     "node-sass": "^4.13.0",
@@ -68,7 +67,6 @@
     "postcss-loader": "^2.0.9",
     "postcss-prefixer": "^2.1.2",
     "prettier": "^1.18.2",
-    "remap-istanbul": "^0.13.0",
     "sass-loader": "^6.0.6",
     "shx": "^0.3.2",
     "webfonts-generator": "^0.4.0",
diff --git a/script/coverage.js b/script/coverage.js
deleted file mode 100644
index 42b1f06..0000000
--- a/script/coverage.js
+++ /dev/null
@@ -1,43 +0,0 @@
-const path = require('path')
-const istanbul = require('istanbul')
-const reduce = require('licia/reduce')
-const keys = require('licia/keys')
-
-let collector = new istanbul.Collector()
-let reporter = new istanbul.Reporter()
-
-let remappedJson = require('../coverage/coverage-remapped.json')
-
-let coverage = reduce(
-  keys(remappedJson),
-  function(result, source) {
-    if (isSrc()) {
-      let correctPath = source.replace(
-        path.resolve(__dirname, '../src'),
-        path.resolve(__dirname, '../')
-      )
-
-      let val = remappedJson[source]
-      val.path = correctPath
-      result[correctPath] = val
-    }
-
-    function isSrc(src) {
-      return (
-        source.match(/src.*\.js$/) &&
-        source.indexOf('node_modules') < 0 &&
-        source.indexOf('util') < 0
-      )
-    }
-
-    return result
-  },
-  {}
-)
-
-collector.add(coverage)
-
-reporter.addAll(['text', 'html', 'lcov'])
-reporter.write(collector, true, function() {
-  console.log('open coverage/index.html to see the coverage report.')
-})