diff --git a/.travis.yml b/.travis.yml
index 878c310..9ba57f9 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,6 +4,7 @@ node_js:
   - 6
   - 8
   - 10
+  - 12
 addons:
   firefox: latest
 env:
@@ -11,13 +12,20 @@ env:
   - WEBPACK_SUFFIX="@2" ETWP_SUFFIX="@2" HWP_SUFFIX="@2"
   - WEBPACK_SUFFIX="@3" ETWP_SUFFIX="@3" HWP_SUFFIX="@2"
   - WEBPACK_SUFFIX="@4" ETWP_SUFFIX="@4.0.0-alpha.0" HWP_SUFFIX="@3"
-  - WEBPACK_SUFFIX="@4" ETWP_SUFFIX="@4.0.0-alpha.0" HWP_SUFFIX="@4.0.0-alpha.2"
+  - WEBPACK_SUFFIX="@4" ETWP_SUFFIX="@4.0.0-alpha.0" HWP_SUFFIX="@4"
+  - WEBPACK_SUFFIX="@5" ETWP_SUFFIX="@4.0.0-alpha.0" HWP_SUFFIX="@4"
 matrix:
   exclude:
   - node_js: 4
     env: WEBPACK_SUFFIX="@4" ETWP_SUFFIX="@4.0.0-alpha.0" HWP_SUFFIX="@3"
   - node_js: 4
-    env: WEBPACK_SUFFIX="@4" ETWP_SUFFIX="@4.0.0-alpha.0" HWP_SUFFIX="@4.0.0-alpha.2"
+    env: WEBPACK_SUFFIX="@4" ETWP_SUFFIX="@4.0.0-alpha.0" HWP_SUFFIX="@4"
+  - node_js: 4
+    env: WEBPACK_SUFFIX="@5" ETWP_SUFFIX="@4.0.0-alpha.0" HWP_SUFFIX="@4"
+  - node_js: 6
+    env: WEBPACK_SUFFIX="@5" ETWP_SUFFIX="@4.0.0-alpha.0" HWP_SUFFIX="@4"
+  - node_js: 8
+    env: WEBPACK_SUFFIX="@5" ETWP_SUFFIX="@4.0.0-alpha.0" HWP_SUFFIX="@4"
 install:
   - npm install || true
   - npm rm webpack extract-text-webpack-plugin eslint
@@ -29,7 +37,6 @@ before_script:
 services:
   - xvfb
 script:
-  - ./node_modules/karma/bin/karma start --single-run --browsers Firefox
   - $(npm bin)/nyc $(npm bin)/mocha --exit --timeout 20000 && $(npm bin)/nyc report --reporter=text-lcov | $(npm bin)/coveralls
 notifications:
   webhooks:
diff --git a/README.md b/README.md
index b57debe..8d94f94 100644
--- a/README.md
+++ b/README.md
@@ -11,9 +11,9 @@ manipulation.
 
 ## Features
 
-- Optional integration with [html-webpack-plugin](https://github.com/ampedandwired/html-webpack-plugin)
-- Automatic support for code splitting (integrity for lazy-loaded chunks)
-- Compatible with Webpack 1.x, 2.x, 3.x and 4.x
+- Optional integration with [html-webpack-plugin](https://github.com/ampedandwired/html-webpack-plugin).
+- Automatic support for dynamic imports (also known as code splitting.)
+- Compatible with all major Webpack versions, up to and including Webpack 5.
 
 ## Installation
 
@@ -21,6 +21,10 @@ manipulation.
 npm install webpack-subresource-integrity --save-dev
 ```
 
+```shell
+yarn add --dev webpack-subresource-integrity
+```
+
 ### Webpack Configuration Example
 
 ```javascript
@@ -81,9 +85,11 @@ template as follows:
 #### Without HtmlWebpackPlugin
 
 The correct value for the `integrity` attribute can be retrieved from
-the `integrity` property of Webpack assets.  However, that property is
-not copied over by Webpack's `stats` module so you'll have to access
-the "original" asset on the `compilation` object.  For example:
+the `integrity` property of Webpack assets.
+
+Note that with Webpack versions before 5, that property is not copied over by
+Webpack's `stats` module so you'll have to access the "original" asset on the
+`compilation` object.  For example:
 
 ```javascript
 compiler.plugin("done", stats => {
diff --git a/appveyor.yml b/appveyor.yml
index 1a7f45c..bc55b7b 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,21 +1,6 @@
 # Test against this version of Node.js
 environment:
   matrix:
-    - nodejs_version: 4
-      WEBPACK_SUFFIX: '@1'
-      ETWP_SUFFIX: '@1'
-      FL_SUFFIX: '@0'
-      HWP_SUFFIX: '@2'
-    - nodejs_version: 4
-      WEBPACK_SUFFIX: '@2'
-      ETWP_SUFFIX: '@2'
-      FL_SUFFIX: '@1'
-      HWP_SUFFIX: '@2'
-    - nodejs_version: 4
-      WEBPACK_SUFFIX: '@3'
-      ETWP_SUFFIX: '@3'
-      FL_SUFFIX: '@1'
-      HWP_SUFFIX: '@2'
     - nodejs_version: 6
       WEBPACK_SUFFIX: '@1'
       ETWP_SUFFIX: '@1'
@@ -40,7 +25,7 @@ environment:
       WEBPACK_SUFFIX: '@4'
       ETWP_SUFFIX: '@4.0.0-alpha.0'
       FL_SUFFIX: '@1'
-      HWP_SUFFIX: '@4.0.0-alpha.2'
+      HWP_SUFFIX: '@4'
     - nodejs_version: 8
       WEBPACK_SUFFIX: '@1'
       ETWP_SUFFIX: '@1'
@@ -65,7 +50,7 @@ environment:
       WEBPACK_SUFFIX: '@4'
       ETWP_SUFFIX: '@4.0.0-alpha.0'
       FL_SUFFIX: '@1'
-      HWP_SUFFIX: '@4.0.0-alpha.2'
+      HWP_SUFFIX: '@4'
     - nodejs_version: 10
       WEBPACK_SUFFIX: '@1'
       ETWP_SUFFIX: '@1'
@@ -90,14 +75,50 @@ environment:
       WEBPACK_SUFFIX: '@4'
       ETWP_SUFFIX: '@4.0.0-alpha.0'
       FL_SUFFIX: '@1'
-      HWP_SUFFIX: '@4.0.0-alpha.2'
+      HWP_SUFFIX: '@4'
+    - nodejs_version: 10
+      WEBPACK_SUFFIX: '@5'
+      ETWP_SUFFIX: '@4.0.0-alpha.0'
+      FL_SUFFIX: '@1'
+      HWP_SUFFIX: '@4'
+    - nodejs_version: 12
+      WEBPACK_SUFFIX: '@1'
+      ETWP_SUFFIX: '@1'
+      FL_SUFFIX: '@0'
+      HWP_SUFFIX: '@2'
+    - nodejs_version: 12
+      WEBPACK_SUFFIX: '@2'
+      ETWP_SUFFIX: '@2'
+      FL_SUFFIX: '@1'
+      HWP_SUFFIX: '@2'
+    - nodejs_version: 12
+      WEBPACK_SUFFIX: '@3'
+      ETWP_SUFFIX: '@3'
+      FL_SUFFIX: '@1'
+      HWP_SUFFIX: '@2'
+    - nodejs_version: 12
+      WEBPACK_SUFFIX: '@4'
+      ETWP_SUFFIX: '@4.0.0-alpha.0'
+      FL_SUFFIX: '@1'
+      HWP_SUFFIX: '@3'
+    - nodejs_version: 12
+      WEBPACK_SUFFIX: '@4'
+      ETWP_SUFFIX: '@4.0.0-alpha.0'
+      FL_SUFFIX: '@1'
+      HWP_SUFFIX: '@4'
+    - nodejs_version: 12
+      WEBPACK_SUFFIX: '@5'
+      ETWP_SUFFIX: '@4.0.0-alpha.0'
+      FL_SUFFIX: '@1'
+      HWP_SUFFIX: '@4'
 
 # Install scripts. (runs after repo cloning)
 install:
   # Get the latest stable version of Node.js or io.js
   - ps: Install-Product node $env:nodejs_version
   # install modules
-  - appveyor-retry npm install --global npm@3
+  - npm cache clean --force
+  - appveyor-retry npm install --global npm@6
   - npm install || true
   - npm rm webpack extract-text-webpack-plugin file-loader eslint
   - npm install "webpack%WEBPACK_SUFFIX%" --ignore-scripts --loglevel=error || true
@@ -111,7 +132,7 @@ test_script:
   - node --version
   - npm --version
   # run tests
-  - npm run mocha
+  - npm run test
 
 # Don't actually build.
 build: off
diff --git a/examples/disabled/webpack.config.js b/examples/disabled/webpack.config.js
index 45c0037..899d1c2 100644
--- a/examples/disabled/webpack.config.js
+++ b/examples/disabled/webpack.config.js
@@ -1,21 +1,9 @@
 var SriPlugin = require('webpack-subresource-integrity');
-var ExtractTextPlugin = require('extract-text-webpack-plugin');
-var createExtractTextLoader = require('../utils').createExtractTextLoader;
-var webpackVersion = Number(
-  require('webpack/package.json').version.split('.')[0]
-);
 
 module.exports = {
   entry: './index.js',
   output: {
     filename: 'bundle.js'
   },
-  module:
-    webpackVersion > 1
-      ? { rules: [{ test: /\.css$/, use: createExtractTextLoader() }] }
-      : { loaders: [{ test: /\.css$/, loader: createExtractTextLoader() }] },
-  plugins: [
-    new ExtractTextPlugin('styles.css'),
-    new SriPlugin({ hashFuncNames: ['sha256'], enabled: false })
-  ]
+  plugins: [new SriPlugin({ hashFuncNames: ['sha256'], enabled: false })]
 };
diff --git a/examples/etp-content-hash/test.js b/examples/etp-content-hash/test.js
index bbd399a..43d566e 100644
--- a/examples/etp-content-hash/test.js
+++ b/examples/etp-content-hash/test.js
@@ -1,4 +1,12 @@
 var expect = require('expect');
+var webpackVersion = Number(
+  require('webpack/package.json').version.split('.')[0]
+);
+
+module.exports.skip = function skip() {
+  // Can't use extract-text-webpack-plugin with Webpack > 4.
+  return webpackVersion > 4;
+};
 
 module.exports.check = function check(stats) {
   expect(stats.compilation.warnings).toEqual([]);
diff --git a/examples/etp-path-join/test.js b/examples/etp-path-join/test.js
index bbd399a..43d566e 100644
--- a/examples/etp-path-join/test.js
+++ b/examples/etp-path-join/test.js
@@ -1,4 +1,12 @@
 var expect = require('expect');
+var webpackVersion = Number(
+  require('webpack/package.json').version.split('.')[0]
+);
+
+module.exports.skip = function skip() {
+  // Can't use extract-text-webpack-plugin with Webpack > 4.
+  return webpackVersion > 4;
+};
 
 module.exports.check = function check(stats) {
   expect(stats.compilation.warnings).toEqual([]);
diff --git a/examples/hwp-custom-template/test.js b/examples/hwp-custom-template/test.js
index df068a9..90f9f14 100644
--- a/examples/hwp-custom-template/test.js
+++ b/examples/hwp-custom-template/test.js
@@ -2,6 +2,14 @@ var select = require('soupselect').select;
 var expect = require('expect');
 var htmlparser = require('htmlparser');
 var fs = require('fs');
+var webpackVersion = Number(
+  require('webpack/package.json').version.split('.')[0]
+);
+
+module.exports.skip = function skip() {
+  // Can't use extract-text-webpack-plugin with Webpack > 4.
+  return webpackVersion > 4;
+};
 
 module.exports.check = function check(stats) {
   var jsIntegrity;
diff --git a/examples/hwp-integrity-attributes/test.js b/examples/hwp-integrity-attributes/test.js
index c915cef..1c980ea 100644
--- a/examples/hwp-integrity-attributes/test.js
+++ b/examples/hwp-integrity-attributes/test.js
@@ -2,6 +2,14 @@ var select = require('soupselect').select;
 var expect = require('expect');
 var htmlparser = require('htmlparser');
 var fs = require('fs');
+var webpackVersion = Number(
+  require('webpack/package.json').version.split('.')[0]
+);
+
+module.exports.skip = function skip() {
+  // Can't use extract-text-webpack-plugin with Webpack > 4.
+  return webpackVersion > 4;
+};
 
 module.exports.check = function check(stats) {
   var jsIntegrity;
diff --git a/examples/hwp-output-parent-dir/test.js b/examples/hwp-output-parent-dir/test.js
index 80e6d55..d28e897 100644
--- a/examples/hwp-output-parent-dir/test.js
+++ b/examples/hwp-output-parent-dir/test.js
@@ -7,7 +7,10 @@ module.exports.check = function check(stats) {
   var jsIntegrity;
 
   expect(stats.compilation.warnings).toEqual([]);
-  jsIntegrity = stats.compilation.assets['bundle.js'].integrity;
+
+  jsIntegrity =
+    stats.toJson().assets.find(asset => asset.name === 'bundle.js').integrity ||
+    stats.compilation.assets['bundle.js'].integrity;
   expect(jsIntegrity).toMatch(/^sha/);
 
   return new Promise((resolve, reject) => {
diff --git a/examples/hwp-public-path/test.js b/examples/hwp-public-path/test.js
index 17b6eb9..dec2f23 100644
--- a/examples/hwp-public-path/test.js
+++ b/examples/hwp-public-path/test.js
@@ -7,7 +7,9 @@ module.exports.check = function check(stats) {
   var jsIntegrity;
 
   expect(stats.compilation.warnings).toEqual([]);
-  jsIntegrity = stats.compilation.assets['bundle.js'].integrity;
+  jsIntegrity =
+    stats.toJson().assets.find(asset => asset.name === 'bundle.js').integrity ||
+    stats.compilation.assets['bundle.js'].integrity;
   expect(jsIntegrity).toMatch(/^sha/);
 
   return new Promise((resolve, reject) => {
diff --git a/examples/hwp-subdirectories/test.js b/examples/hwp-subdirectories/test.js
index f100937..acf4112 100644
--- a/examples/hwp-subdirectories/test.js
+++ b/examples/hwp-subdirectories/test.js
@@ -4,7 +4,9 @@ var htmlparser = require('htmlparser');
 var fs = require('fs');
 
 module.exports.check = function check(stats) {
-  var jsIntegrity = stats.compilation.assets['subdir/bundle.js'].integrity;
+  var jsIntegrity =
+    stats.toJson().assets.find(asset => asset.name === 'subdir/bundle.js')
+      .integrity || stats.compilation.assets['subdir/bundle.js'].integrity;
   expect(jsIntegrity).toMatch(/^sha/);
 
   return new Promise((resolve, reject) => {
diff --git a/examples/mini-css-extract-plugin/test.js b/examples/mini-css-extract-plugin/test.js
index 1a5fdd3..3751289 100644
--- a/examples/mini-css-extract-plugin/test.js
+++ b/examples/mini-css-extract-plugin/test.js
@@ -4,5 +4,5 @@ var webpackVersion = Number(
 
 module.exports.skip = function skip() {
   // mini-css-extract-plugin needs Webpack 4
-  return webpackVersion < 4;
+  return webpackVersion !== 4;
 };
diff --git a/examples/no-error-invalid-config/test.js b/examples/no-error-invalid-config/test.js
index e450ee5..94c8df1 100644
--- a/examples/no-error-invalid-config/test.js
+++ b/examples/no-error-invalid-config/test.js
@@ -1,5 +1,13 @@
 var expect = require('expect');
 var ChunkRenderError = require('webpack/lib/ChunkRenderError');
+var webpackVersion = Number(
+  require('webpack/package.json').version.split('.')[0]
+);
+
+module.exports.skip = function skip() {
+  // Error doesn't get triggered with Webpack > 4.
+  return webpackVersion > 4;
+};
 
 module.exports.ignoreErrors = true;
 
diff --git a/examples/no-error-invalid-config/webpack.config.js b/examples/no-error-invalid-config/webpack.config.js
index 5a63543..9416156 100644
--- a/examples/no-error-invalid-config/webpack.config.js
+++ b/examples/no-error-invalid-config/webpack.config.js
@@ -1,5 +1,4 @@
 var SriPlugin = require('webpack-subresource-integrity');
-var HtmlWebpackPlugin = require('html-webpack-plugin');
 
 module.exports = {
   entry: './index.js',
diff --git a/examples/sourcemap-code-splitting/test.js b/examples/sourcemap-code-splitting/test.js
index 698ba06..5b2ac25 100644
--- a/examples/sourcemap-code-splitting/test.js
+++ b/examples/sourcemap-code-splitting/test.js
@@ -17,6 +17,6 @@ module.exports.check = function check() {
   }
 
   var sriHashesInSource = findAndStripSriHashString('dist/index.js', 'sha256-', -10);
-  var sriHashesInMap = findAndStripSriHashString('dist/index.js.map', 'var sriHashes = ');
+  var sriHashesInMap = findAndStripSriHashString('dist/index.js.map', '__webpack_require__.sriHashes = ');
   expect(sriHashesInSource.length).toEqual(sriHashesInMap.length);
 };
diff --git a/index.js b/index.js
index e85f09c..99517ba 100644
--- a/index.js
+++ b/index.js
@@ -7,7 +7,9 @@
 
 var crypto = require('crypto');
 var path = require('path');
-var ReplaceSource = require('webpack-sources/lib/ReplaceSource');
+var webpack = require('webpack');
+// eslint-disable-next-line global-require
+var ReplaceSource = (webpack.sources || require('webpack-sources')).ReplaceSource;
 var util = require('./util');
 var WebIntegrityJsonpMainTemplatePlugin = require('./jmtp');
 var HtmlWebpackPlugin;
@@ -41,6 +43,8 @@ function SubresourceIntegrityPlugin(options) {
   Object.assign(this.options, useOptions);
 
   this.emittedMessages = {};
+
+  this.assetIntegrity = new Map();
 }
 
 SubresourceIntegrityPlugin.prototype.emitMessage = function emitMessage(messages, message) {
@@ -203,29 +207,28 @@ SubresourceIntegrityPlugin.prototype.processChunk = function processChunk(
 
   Array.from(util.findChunks(chunk)).reverse().forEach(childChunk => {
     var sourcePath;
+    var files = Array.isArray(childChunk.files) ? new Set(childChunk.files) : childChunk.files;
 
     // This can happen with invalid Webpack configurations
-    if (childChunk.files.length === 0) return;
+    if (files.size === 0) return;
 
     sourcePath = compilation.sriChunkAssets[childChunk.id];
 
-    if (childChunk.files.indexOf(sourcePath) < 0) {
+    if (!files.has(sourcePath)) {
       self.warnOnce(
         compilation,
         'Cannot determine asset for chunk ' + childChunk.id + ', computed="' + sourcePath +
-          '", available=' + childChunk.files[0] + '. Please report this full error message ' +
+          '", available=' + Array.from(childChunk.files)[0] + '. Please report this full error message ' +
           'along with your Webpack configuration at ' +
           'https://github.com/waysact/webpack-subresource-integrity/issues/new'
       );
-      sourcePath = childChunk.files[0];
+      sourcePath = Array.from(files)[0];
     }
 
     self.warnIfHotUpdate(compilation, assets[sourcePath].source());
-    newAsset = self.replaceAsset(
-      assets,
-      hashByChunkId,
-      sourcePath);
+    newAsset = self.replaceAsset(assets, hashByChunkId, sourcePath);
     hashByChunkId.set(childChunk.id, newAsset.integrity);
+    this.assetIntegrity.set(sourcePath, newAsset.integrity);
   });
 };
 
@@ -237,6 +240,16 @@ SubresourceIntegrityPlugin.prototype.chunkAsset =
     }
   };
 
+SubresourceIntegrityPlugin.prototype.statsFactory =
+  function stats(compilation, statsFactory) {
+    statsFactory.hooks.extract.for("asset").tap('SriPlugin', (object, asset) => {
+      if (this.assetIntegrity.has(asset.name)) {
+        // eslint-disable-next-line no-param-reassign
+        object.integrity = String(this.assetIntegrity.get(asset.name));
+      }
+    });
+  };
+
 SubresourceIntegrityPlugin.prototype.addMissingIntegrityHashes =
   function addMissingIntegrityHashes(assets) {
     var self = this;
@@ -256,7 +269,7 @@ SubresourceIntegrityPlugin.prototype.afterOptimizeAssets =
   function afterOptimizeAssets(compilation, assets) {
     var self = this;
 
-    compilation.chunks.filter(util.isRuntimeChunk).forEach(function forEachChunk(chunk) {
+    Array.from(compilation.chunks).filter(util.isRuntimeChunk).forEach(function forEachChunk(chunk) {
       self.processChunk(chunk, compilation, assets);
     });
 
@@ -343,40 +356,77 @@ SubresourceIntegrityPlugin.prototype.registerHwpHooks =
     }
   };
 
-SubresourceIntegrityPlugin.prototype.thisCompilation =
-  function thisCompilation(compiler, compilation) {
-    var afterOptimizeAssets = this.afterOptimizeAssets.bind(this, compilation);
-    var beforeChunkAssets = this.beforeChunkAssets.bind(this, compilation);
-    var alterAssetTags = this.alterAssetTags.bind(this, compilation);
-    var beforeHtmlGeneration = this.beforeHtmlGeneration.bind(this, compilation);
+SubresourceIntegrityPlugin.prototype.thisCompilation = function thisCompilation(
+  compiler,
+  compilation
+) {
+  this.validateOptions(compilation);
 
-    this.validateOptions(compilation);
+  if (!this.options.enabled) {
+    return;
+  }
 
-    if (!this.options.enabled) {
-      return;
-    }
+  this.registerJMTP(compilation);
 
-    this.registerJMTP(compilation);
+  // FIXME: refactor into separate per-compilation state
+  // eslint-disable-next-line no-param-reassign
+  compilation.sriChunkAssets = {};
 
-    // FIXME: refactor into separate per-compilation state
-    // eslint-disable-next-line no-param-reassign
-    compilation.sriChunkAssets = {};
+  /*
+   *  html-webpack support:
+   *    Modify the asset tags before webpack injects them for anything with an integrity value.
+   */
+  if (compiler.hooks) {
+    this.setupHooks(compiler, compilation);
+  } else {
+    this.setupLegacyHooks(compiler, compilation);
+  }
+};
 
-    /*
-     *  html-webpack support:
-     *    Modify the asset tags before webpack injects them for anything with an integrity value.
-     */
-    if (compiler.hooks) {
-      compilation.hooks.afterOptimizeAssets.tap('SriPlugin', afterOptimizeAssets);
-      compilation.hooks.beforeChunkAssets.tap('SriPlugin', beforeChunkAssets);
-      compiler.hooks.compilation.tap('HtmlWebpackPluginHooks', this.registerHwpHooks.bind(this, alterAssetTags, beforeHtmlGeneration));
-    } else {
-      compilation.plugin('after-optimize-assets', afterOptimizeAssets);
-      compilation.plugin('before-chunk-assets', beforeChunkAssets);
-      compilation.plugin('html-webpack-plugin-alter-asset-tags', alterAssetTags);
-      compilation.plugin('html-webpack-plugin-before-html-generation', beforeHtmlGeneration);
-    }
-  };
+SubresourceIntegrityPlugin.prototype.setupHooks = function setupHooks(
+  compiler,
+  compilation
+) {
+  var afterOptimizeAssets = this.afterOptimizeAssets.bind(this, compilation);
+  var beforeChunkAssets = this.beforeChunkAssets.bind(this, compilation);
+  var alterAssetTags = this.alterAssetTags.bind(this, compilation);
+  var beforeHtmlGeneration = this.beforeHtmlGeneration.bind(this, compilation);
+
+  if (compilation.hooks.processAssets) {
+    compilation.hooks.processAssets.tap(
+      {
+        name: 'SriPlugin',
+        stage: webpack.Compilation.PROCESS_ASSETS_STAGE_OPTIMIZE_HASH
+      },
+      afterOptimizeAssets
+    );
+  } else {
+    compilation.hooks.afterOptimizeAssets.tap('SriPlugin', afterOptimizeAssets);
+  }
+  compilation.hooks.beforeChunkAssets.tap('SriPlugin', beforeChunkAssets);
+  compiler.hooks.compilation.tap(
+    'HtmlWebpackPluginHooks',
+    this.registerHwpHooks.bind(this, alterAssetTags, beforeHtmlGeneration)
+  );
+};
+
+SubresourceIntegrityPlugin.prototype.setupLegacyHooks = function setupLegacyHooks(
+  compiler,
+  compilation
+) {
+  var afterOptimizeAssets = this.afterOptimizeAssets.bind(this, compilation);
+  var beforeChunkAssets = this.beforeChunkAssets.bind(this, compilation);
+  var alterAssetTags = this.alterAssetTags.bind(this, compilation);
+  var beforeHtmlGeneration = this.beforeHtmlGeneration.bind(this, compilation);
+
+  compilation.plugin('after-optimize-assets', afterOptimizeAssets);
+  compilation.plugin('before-chunk-assets', beforeChunkAssets);
+  compilation.plugin('html-webpack-plugin-alter-asset-tags', alterAssetTags);
+  compilation.plugin(
+    'html-webpack-plugin-before-html-generation',
+    beforeHtmlGeneration
+  );
+};
 
 SubresourceIntegrityPlugin.prototype.beforeChunkAssets = function afterPlugins(compilation) {
   var chunkAsset = this.chunkAsset.bind(this, compilation);
@@ -390,6 +440,13 @@ SubresourceIntegrityPlugin.prototype.beforeChunkAssets = function afterPlugins(c
 SubresourceIntegrityPlugin.prototype.afterPlugins = function afterPlugins(compiler) {
   if (compiler.hooks) {
     compiler.hooks.thisCompilation.tap('SriPlugin', this.thisCompilation.bind(this, compiler));
+
+    compiler.hooks.compilation.tap("DefaultStatsFactoryPlugin", compilation => {
+      if (compilation.hooks.statsFactory) {
+        compilation.hooks.statsFactory.tap('SriPlugin', this.statsFactory.bind(this, compilation));
+      }
+    });
+
   } else {
     compiler.plugin('this-compilation', this.thisCompilation.bind(this, compiler));
   }
diff --git a/jmtp.js b/jmtp.js
index 3da48b7..79c99c8 100644
--- a/jmtp.js
+++ b/jmtp.js
@@ -19,10 +19,10 @@ WebIntegrityJsonpMainTemplatePlugin.prototype.addSriHashes =
     var includedChunks = chunk.getChunkMaps().hash;
     var hashFuncNames = this.sriPlugin.options.hashFuncNames;
 
-    if (allChunks.size > 0) {
+    if (Object.keys(includedChunks).length > 0) {
       return (Template.asString || mainTemplate.asString)([
         source,
-        'var sriHashes = ' +
+        '__webpack_require__.sriHashes = ' +
           JSON.stringify(
             Array.from(allChunks).reduce(function chunkIdReducer(
               sriHashes,
@@ -47,8 +47,9 @@ WebIntegrityJsonpMainTemplatePlugin.prototype.addSriHashes =
  *  Patch jsonp-script code to add the integrity attribute.
  */
 WebIntegrityJsonpMainTemplatePlugin.prototype.addAttribute =
-  function addAttribute(mainTemplate, elName, source) {
-    if (!mainTemplate.outputOptions.crossOriginLoading) {
+  function addAttribute(mainTemplate, elName, source, chunk) {
+    const outputOptions = this.compilation.outputOptions || mainTemplate.outputOptions;
+    if (!outputOptions.crossOriginLoading) {
       this.sriPlugin.errorOnce(
         this.compilation,
         'webpack option output.crossOriginLoading not set, code splitting will not work!'
@@ -56,8 +57,8 @@ WebIntegrityJsonpMainTemplatePlugin.prototype.addAttribute =
     }
     return (Template.asString || mainTemplate.asString)([
       source,
-      elName + '.integrity = sriHashes[chunkId];',
-      elName + '.crossOrigin = ' + JSON.stringify(mainTemplate.outputOptions.crossOriginLoading) + ';',
+      elName + '.integrity = __webpack_require__.sriHashes[' + (chunk ? `'${chunk.id}'` : 'chunkId') + '];',
+      elName + '.crossOrigin = ' + JSON.stringify(outputOptions.crossOriginLoading) + ';',
     ]);
   };
 
@@ -68,18 +69,21 @@ WebIntegrityJsonpMainTemplatePlugin.prototype.apply = function apply(
   var linkPreloadPlugin = this.addAttribute.bind(this, mainTemplate, "link");
   var addSriHashes = this.addSriHashes.bind(this, mainTemplate);
 
-  if (!mainTemplate.hooks) {
-    mainTemplate.plugin('jsonp-script', jsonpScriptPlugin);
-    mainTemplate.plugin('local-vars', addSriHashes);
-  } else if (mainTemplate.hooks.jsonpScript && mainTemplate.hooks.localVars) {
-    mainTemplate.hooks.jsonpScript.tap('SriPlugin', jsonpScriptPlugin);
-    mainTemplate.hooks.linkPreload.tap('SriPlugin', linkPreloadPlugin);
-    mainTemplate.hooks.localVars.tap('SriPlugin', addSriHashes);
-  } else {
+  if (this.compilation.compiler.options.target !== 'web') {
     this.sriPlugin.warnOnce(
       this.compilation,
       'This plugin is not useful for non-web targets.'
     );
+    return;
+  }
+
+  if (mainTemplate.hooks) {
+    mainTemplate.hooks.jsonpScript.tap('SriPlugin', jsonpScriptPlugin);
+    mainTemplate.hooks.linkPreload.tap('SriPlugin', linkPreloadPlugin);
+    mainTemplate.hooks.localVars.tap('SriPlugin', addSriHashes);
+  } else {
+    mainTemplate.plugin('jsonp-script', jsonpScriptPlugin);
+    mainTemplate.plugin('local-vars', addSriHashes);
   }
 };
 
diff --git a/package.json b/package.json
index 7600d5e..0ba6065 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "webpack-subresource-integrity",
-  "version": "1.4.1",
+  "version": "1.5.0",
   "description": "Webpack plugin for enabling Subresource Integrity",
   "engines": {
     "node": ">=4"
@@ -9,8 +9,8 @@
   "scripts": {
     "codeclimate": "docker run --interactive --tty --rm --env CODECLIMATE_CODE=\"$PWD\" --volume \"$PWD\":/code --volume /var/run/docker.sock:/var/run/docker.sock --volume /tmp/cc:/tmp/cc codeclimate/codeclimate",
     "coverage": "nyc $(npm bin)/mocha --exit --timeout 20000",
-    "test": "karma start --single-run && mocha --exit --timeout 20000",
-    "mocha": "mocha --exit --timeout 20000",
+    "karma": "karma start --single-run",
+    "test": "mocha --exit --timeout 20000",
     "lint": "eslint .",
     "prettier": "prettier --write '**/*.js'"
   },
@@ -76,8 +76,8 @@
     "webpack-fix-style-only-entries": "^0.4.0"
   },
   "peerDependencies": {
-    "html-webpack-plugin": "^2.21.0 || ~3 || >=4.0.0-alpha.2 <5",
-    "webpack": "^1.12.11 || ~2 || ~3 || ~4"
+    "html-webpack-plugin": ">= 2.21.0 < 5",
+    "webpack": ">= 1.12.11 < 6"
   },
   "peerDependenciesMeta": {
     "html-webpack-plugin": {
@@ -93,7 +93,12 @@
     "jmtp.js"
   ],
   "nyc": {
-    "exclude": ["coverage/**", "test/**", "examples/**", "**/node_modules/**"]
+    "exclude": [
+      "coverage/**",
+      "test/**",
+      "examples/**",
+      "**/node_modules/**"
+    ]
   },
   "prettier": {
     "singleQuote": true