diff --git a/gulpfile.babel.js b/gulpfile.babel.js
index 8966eb6..91e5ce2 100644
--- a/gulpfile.babel.js
+++ b/gulpfile.babel.js
@@ -33,21 +33,20 @@ webpackConfig.forEach((c) => {
       minimize: true,
       debug: false
     }))
-    c.plugins.push(new webpack.optimize.DedupePlugin())
-    if (c.uglify) {
-      c.plugins.push(new webpack.optimize.UglifyJsPlugin({
-        compress: {
-          warnings: false,
-          screw_ie8: true
-        },
-        comments: false,
-        mangle: {
-          screw_ie8: true
-        },
-        screw_ie8: true,
-        sourceMap: !!c.devtool
-      }))
-    }
+    /*
+    c.plugins.push(new webpack.optimize.UglifyJsPlugin({
+      compress: {
+        warnings: false,
+        screw_ie8: true
+      },
+      comments: false,
+      mangle: {
+        screw_ie8: true
+      },
+      screw_ie8: true,
+      sourceMap: !!c.devtool
+    }))
+    */
   }
   c.plugins.push(new webpack.DefinePlugin({
     FIMFIC2EPUB_VERSION: JSON.stringify(require('./package.json').version)
diff --git a/src/cleanMarkup.js b/src/cleanMarkup.js
index 12f16b1..032d3e9 100644
--- a/src/cleanMarkup.js
+++ b/src/cleanMarkup.js
@@ -9,7 +9,7 @@ import isNode from 'detect-node'
 
 let tidy
 if (!isNode) {
-  tidy = require('exports?tidy_html5!tidy-html5')
+  tidy = require('exports-loader?tidy_html5!tidy-html5')
 } else {
   tidy = require('tidy-html5').tidy_html5
 }
diff --git a/src/constants.js b/src/constants.js
index 49f5b12..b502688 100644
--- a/src/constants.js
+++ b/src/constants.js
@@ -1,5 +1,5 @@
 
-export let NS = {
+export const NS = {
   OPF: 'http://www.idpf.org/2007/opf',
   OPS: 'http://www.idpf.org/2007/ops',
   DC: 'http://purl.org/dc/elements/1.1/',
@@ -9,7 +9,7 @@ export let NS = {
   XLINK: 'http://www.w3.org/1999/xlink'
 }
 
-export let tidyOptions = {
+export const tidyOptions = {
   'indent': 'auto',
   'numeric-entities': 'yes',
   'output-xhtml': 'yes',
@@ -22,11 +22,11 @@ export let tidyOptions = {
   'show-body-only': 'auto'
 }
 
-export let containerXml = `<?xml version="1.0" encoding="UTF-8"?>
+export const containerXml = `<?xml version="1.0" encoding="UTF-8"?>
 <container version="1.0" xmlns="urn:oasis:names:tc:opendocument:xmlns:container">
   <rootfiles>
     <rootfile full-path="OEBPS/content.opf" media-type="application/oebps-package+xml"/>
   </rootfiles>
 </container>
 `
-export let youtubeKey = 'AIzaSyCF1taix0lTr7-e_XBZazIXfAr8IvxTJhA'
+export const youtubeKey = 'AIzaSyCF1taix0lTr7-e_XBZazIXfAr8IvxTJhA'
diff --git a/webpack.config.babel.js b/webpack.config.babel.js
index 1d71bce..ae65ddf 100644
--- a/webpack.config.babel.js
+++ b/webpack.config.babel.js
@@ -16,10 +16,10 @@ const bundleExtensionConfig = {
   },
 
   module: {
-    loaders: [
+    rules: [
       {
         test: /\.js$/,
-        loader: 'babel',
+        use: 'babel-loader',
         exclude: /node_modules/,
         query: {
           sourceMaps: true,
@@ -28,7 +28,7 @@ const bundleExtensionConfig = {
       },
       {
         test: /\.styl$/,
-        loader: 'raw-loader!stylus-loader'
+        use: ['raw-loader', 'stylus-loader']
       }
     ],
     noParse: [
@@ -37,7 +37,7 @@ const bundleExtensionConfig = {
   },
 
   resolve: {
-    extensions: ['', '.js', '.json', '.styl'],
+    extensions: ['.js', '.json', '.styl'],
     modules: [
       path.resolve('./src'),
       'node_modules'
@@ -50,9 +50,7 @@ const bundleExtensionConfig = {
   externals: ['request', 'tidy-html5'],
 
   plugins: [],
-  devtool: 'source-map',
-  debug: true,
-  uglify: inProduction
+  devtool: 'source-map'
 }
 
 const bundleNpmModuleConfig = {
@@ -67,10 +65,10 @@ const bundleNpmModuleConfig = {
   target: 'node',
 
   module: {
-    loaders: [
+    rules: [
       {
         test: /\.js$/,
-        loader: 'babel',
+        use: 'babel-loader',
         exclude: /node_modules/,
         query: {
           sourceMaps: !inProduction,
@@ -79,7 +77,7 @@ const bundleNpmModuleConfig = {
       },
       {
         test: /\.styl$/,
-        loader: 'raw-loader!stylus-loader'
+        use: ['raw-loader', 'stylus-loader']
       }
     ],
     noParse: [
@@ -88,7 +86,7 @@ const bundleNpmModuleConfig = {
   },
 
   resolve: {
-    extensions: ['', '.js', '.json', '.styl'],
+    extensions: ['.js', '.json', '.styl'],
     modules: [
       path.resolve('./src'),
       'node_modules'
@@ -98,9 +96,7 @@ const bundleNpmModuleConfig = {
   externals: [nodeExternals({whitelist: ['es6-event-emitter', /^babel-runtime/]}), 'exports?tidy_html5!tidy-html5'],
 
   plugins: [],
-  devtool: 'source-map',
-  debug: true,
-  uglify: inProduction
+  devtool: 'source-map'
 }
 
 export default [bundleExtensionConfig, bundleNpmModuleConfig]