diff --git a/.gitattributes b/.gitattributes
index b07091b9..9d37df8f 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -1,3 +1,4 @@
 package-lock.json -diff
 * text=auto
-bin/* eol=lf
\ No newline at end of file
+test/cases/* eol=lf
+bin/* eol=lf
diff --git a/README.md b/README.md
index 87c73feb..d1a6fca2 100644
--- a/README.md
+++ b/README.md
@@ -92,6 +92,11 @@ When inlining CSS `data-href` must be used.
   <tbody>
 </table>
 
+#### Long Term Caching
+
+For long term caching use `filename: "[contenthash].css"`. Optionally add `[name]`.
+
+
 [npm]: https://img.shields.io/npm/v/mini-css-extract-plugin.svg
 [npm-url]: https://npmjs.com/package/mini-css-extract-plugin
 
diff --git a/package.json b/package.json
index 22fcd3f1..a9b4b1d3 100644
--- a/package.json
+++ b/package.json
@@ -44,7 +44,7 @@
     "nsp": "^3.1.0",
     "pre-commit": "^1.2.2",
     "standard-version": "^4.3.0",
-    "webpack": "^4.1.0",
+    "webpack": "^4.3.0",
     "webpack-cli": "^2.0.13",
     "webpack-defaults": "^1.6.0",
     "webpack-dev-server": "^3.1.1"
@@ -56,7 +56,7 @@
     "node": ">= 6.11.5"
   },
   "peerDependencies": {
-    "webpack": "^4.1.0"
+    "webpack": "^4.3.0"
   },
   "pre-commit": "lint-staged",
   "lint-staged": {
diff --git a/src/index.js b/src/index.js
index 3ecc998c..210b5abc 100644
--- a/src/index.js
+++ b/src/index.js
@@ -4,7 +4,7 @@ import webpack from 'webpack';
 import sources from 'webpack-sources';
 
 const { ConcatSource, SourceMapSource, OriginalSource } = sources;
-const { Template } = webpack;
+const { Template, util: { createHash } } = webpack;
 
 const NS = path.dirname(fs.realpathSync(__filename));
 
@@ -57,7 +57,7 @@ class CssModule extends webpack.Module {
   nameForCondition() {
     const resource = this._identifier.split('!').pop();
     const idx = resource.indexOf('?');
-    if (idx >= 0) return resource.substr(0, idx);
+    if (idx >= 0) return resource.substring(0, idx);
     return resource;
   }
 
@@ -66,6 +66,13 @@ class CssModule extends webpack.Module {
     this.buildMeta = {};
     callback();
   }
+
+  updateHash(hash) {
+    super.updateHash(hash);
+    hash.update(this.content);
+    hash.update(this.media || '');
+    hash.update(JSON.stringify(this.sourceMap || ''));
+  }
 }
 
 class CssModuleFactory {
@@ -121,6 +128,7 @@ class MiniCssExtractPlugin {
             filenameTemplate: this.options.filename,
             pathOptions: {
               chunk,
+              contentHashType: NS,
             },
             identifier: `mini-css-extract-plugin.${chunk.id}`,
           });
@@ -134,11 +142,26 @@ class MiniCssExtractPlugin {
             filenameTemplate: this.options.chunkFilename,
             pathOptions: {
               chunk,
+              contentHashType: NS,
             },
             identifier: `mini-css-extract-plugin.${chunk.id}`,
           });
         }
       });
+      compilation.hooks.contentHash.tap(pluginName, (chunk) => {
+        const { outputOptions } = compilation;
+        const { hashFunction, hashDigest, hashDigestLength } = outputOptions;
+        const hash = createHash(hashFunction);
+        for (const m of chunk.modulesIterable) {
+          if (m.type === NS) {
+            m.updateHash(hash);
+          }
+        }
+        const { contentHash } = chunk;
+        contentHash[NS] = hash
+          .digest(hashDigest)
+          .substring(0, hashDigestLength);
+      });
       const { mainTemplate } = compilation;
       mainTemplate.hooks.localVars.tap(
         pluginName,
@@ -178,13 +201,35 @@ class MiniCssExtractPlugin {
                     const shortChunkHashMap = Object.create(null);
                     for (const chunkId of Object.keys(chunkMaps.hash)) {
                       if (typeof chunkMaps.hash[chunkId] === 'string') {
-                        shortChunkHashMap[chunkId] = chunkMaps.hash[chunkId].substr(0, length);
+                        shortChunkHashMap[chunkId] = chunkMaps.hash[chunkId].substring(0, length);
                       }
                     }
                     return `" + ${JSON.stringify(shortChunkHashMap)}[chunkId] + "`;
                   },
+                  contentHash: {
+                    [NS]: `" + ${JSON.stringify(
+                      chunkMaps.contentHash[NS],
+                    )}[chunkId] + "`,
+                  },
+                  contentHashWithLength: {
+                    [NS]: (length) => {
+                      const shortContentHashMap = {};
+                      const contentHash = chunkMaps.contentHash[NS];
+                      for (const chunkId of Object.keys(contentHash)) {
+                        if (typeof contentHash[chunkId] === 'string') {
+                          shortContentHashMap[chunkId] = contentHash[
+                            chunkId
+                          ].substring(0, length);
+                        }
+                      }
+                      return `" + ${JSON.stringify(
+                        shortContentHashMap,
+                      )}[chunkId] + "`;
+                    },
+                  },
                   name: `" + (${JSON.stringify(chunkMaps.name)}[chunkId]||chunkId) + "`,
                 },
+                contentHashType: NS,
               },
             );
             return Template.asString([
diff --git a/test/TestCases.test.js b/test/TestCases.test.js
index 53c7b842..bb6ecc91 100644
--- a/test/TestCases.test.js
+++ b/test/TestCases.test.js
@@ -13,13 +13,16 @@ describe('TestCases', () => {
         const outputDirectoryForCase = path.resolve(outputDirectory, directory);
         // eslint-disable-next-line import/no-dynamic-require, global-require
         const webpackConfig = require(path.resolve(directoryForCase, 'webpack.config.js'));
-        webpack(Object.assign({
-          mode: 'none',
-          context: directoryForCase,
-          output: {
-            path: outputDirectoryForCase,
-          },
-        }, webpackConfig), (err, stats) => {
+        for (const config of [].concat(webpackConfig)) {
+          Object.assign(config, {
+            mode: 'none',
+            context: directoryForCase,
+            output: Object.assign({
+              path: outputDirectoryForCase,
+            }, config.output),
+          }, config);
+        }
+        webpack(webpackConfig, (err, stats) => {
           if (err) {
             done(err);
             return;
diff --git a/test/cases/contenthash/expected/1.main.eaf8d14ae542d0855a7d.css b/test/cases/contenthash/expected/1.main.eaf8d14ae542d0855a7d.css
new file mode 100644
index 00000000..aea53e43
--- /dev/null
+++ b/test/cases/contenthash/expected/1.main.eaf8d14ae542d0855a7d.css
@@ -0,0 +1,2 @@
+body { background: red; }
+
diff --git a/test/cases/contenthash/expected/2.main.ae0f5d087b9f049f864a.css b/test/cases/contenthash/expected/2.main.ae0f5d087b9f049f864a.css
new file mode 100644
index 00000000..1a6052d7
--- /dev/null
+++ b/test/cases/contenthash/expected/2.main.ae0f5d087b9f049f864a.css
@@ -0,0 +1,2 @@
+body { background: green; }
+
diff --git a/test/cases/contenthash/index.js b/test/cases/contenthash/index.js
new file mode 100644
index 00000000..aa3357bf
--- /dev/null
+++ b/test/cases/contenthash/index.js
@@ -0,0 +1 @@
+import './style.css';
diff --git a/test/cases/contenthash/style1.css b/test/cases/contenthash/style1.css
new file mode 100644
index 00000000..31fc5b8a
--- /dev/null
+++ b/test/cases/contenthash/style1.css
@@ -0,0 +1 @@
+body { background: red; }
diff --git a/test/cases/contenthash/style2.css b/test/cases/contenthash/style2.css
new file mode 100644
index 00000000..56af6df5
--- /dev/null
+++ b/test/cases/contenthash/style2.css
@@ -0,0 +1 @@
+body { background: green; }
diff --git a/test/cases/contenthash/webpack.config.js b/test/cases/contenthash/webpack.config.js
new file mode 100644
index 00000000..213bcc8d
--- /dev/null
+++ b/test/cases/contenthash/webpack.config.js
@@ -0,0 +1,29 @@
+const Self = require('../../../');
+
+module.exports = [1, 2].map(n => ({
+  entry: './index.js',
+  module: {
+    rules: [
+      {
+        test: /\.css$/,
+        use: [
+          Self.loader,
+          'css-loader',
+        ],
+      },
+    ],
+  },
+  output: {
+    filename: `${n}.[name].js`
+  },
+  resolve: {
+    alias: {
+      './style.css': `./style${n}.css`
+    }
+  },
+  plugins: [
+    new Self({
+      filename: `${n}.[name].[contenthash].css`,
+    }),
+  ],
+}));
diff --git a/test/cases/js-hash/expected/style.41bf047ed4fa005a3e24.js b/test/cases/js-hash/expected/style.41bf047ed4fa005a3e24.js
new file mode 100644
index 00000000..21f472ef
--- /dev/null
+++ b/test/cases/js-hash/expected/style.41bf047ed4fa005a3e24.js
@@ -0,0 +1,10 @@
+(window["webpackJsonp"] = window["webpackJsonp"] || []).push([[1],[
+/* 0 */,
+/* 1 */
+/***/ (function(module, exports, __webpack_require__) {
+
+// extracted by mini-css-extract-plugin
+module.exports = {"a":"wX52cuPepLZcpDx5S3yYO"};
+
+/***/ })
+]]);
\ No newline at end of file
diff --git a/test/cases/js-hash/expected/style.44c5db65e2b053b76abc.fde1566f2c635787864b.css b/test/cases/js-hash/expected/style.44c5db65e2b053b76abc.fde1566f2c635787864b.css
new file mode 100644
index 00000000..39afb1fb
--- /dev/null
+++ b/test/cases/js-hash/expected/style.44c5db65e2b053b76abc.fde1566f2c635787864b.css
@@ -0,0 +1 @@
+.wX52cuPepLZcpDx5S3yYO { background: red; }
diff --git a/test/cases/js-hash/expected/style.fadeeffaa38bf4f2edd8.802f6f3e865dd4e83d8e.css b/test/cases/js-hash/expected/style.fadeeffaa38bf4f2edd8.802f6f3e865dd4e83d8e.css
new file mode 100644
index 00000000..f557e02c
--- /dev/null
+++ b/test/cases/js-hash/expected/style.fadeeffaa38bf4f2edd8.802f6f3e865dd4e83d8e.css
@@ -0,0 +1 @@
+.wX52cuPepLZcpDx5S3yYO { background: green; }
diff --git a/test/cases/js-hash/index.js b/test/cases/js-hash/index.js
new file mode 100644
index 00000000..00b23fa4
--- /dev/null
+++ b/test/cases/js-hash/index.js
@@ -0,0 +1 @@
+import(/* webpackChunkName: "style" */'./style.css');
diff --git a/test/cases/js-hash/loader.js b/test/cases/js-hash/loader.js
new file mode 100644
index 00000000..219e4f57
--- /dev/null
+++ b/test/cases/js-hash/loader.js
@@ -0,0 +1,4 @@
+module.exports = function(source) {
+  const { number } = this.query;
+  return source.split(/\r?\n/)[number-1];
+};
diff --git a/test/cases/js-hash/style.css b/test/cases/js-hash/style.css
new file mode 100644
index 00000000..3176c972
--- /dev/null
+++ b/test/cases/js-hash/style.css
@@ -0,0 +1,2 @@
+.a { background: red; }
+.a { background: green; }
diff --git a/test/cases/js-hash/webpack.config.js b/test/cases/js-hash/webpack.config.js
new file mode 100644
index 00000000..de241c13
--- /dev/null
+++ b/test/cases/js-hash/webpack.config.js
@@ -0,0 +1,36 @@
+const Self = require('../../../');
+
+module.exports = [1, 2].map(n => ({
+  entry: './index.js',
+  module: {
+    rules: [
+      {
+        test: /\.css$/,
+        use: [
+          Self.loader,
+          {
+            loader: 'css-loader',
+            options: {
+              modules: true,
+            },
+          },
+          {
+            loader: './loader',
+            ident: 'my-loader',
+            options: {
+              number: n
+            }
+          }
+        ],
+      },
+    ],
+  },
+  output: {
+    filename: `[name].[contenthash].js`
+  },
+  plugins: [
+    new Self({
+      filename: `[name].[contenthash].[chunkhash].css`,
+    }),
+  ],
+}));
diff --git a/yarn.lock b/yarn.lock
index c60330c0..5bc3d99c 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1327,7 +1327,7 @@ cac@^3.0.3:
     suffix "^0.1.0"
     text-table "^0.2.0"
 
-cacache@^10.0.1:
+cacache@^10.0.4:
   version "10.0.4"
   resolved "https://registry.yarnpkg.com/cacache/-/cacache-10.0.4.tgz#6452367999eff9d4188aefd9a14e9d7c6a263460"
   dependencies:
@@ -6922,7 +6922,7 @@ sax@^1.2.4, sax@~1.2.1:
   version "1.2.4"
   resolved "https://registry.yarnpkg.com/sax/-/sax-1.2.4.tgz#2816234e2378bddc4e5354fab5caa895df7100d9"
 
-schema-utils@^0.4.2:
+schema-utils@^0.4.2, schema-utils@^0.4.5:
   version "0.4.5"
   resolved "https://registry.yarnpkg.com/schema-utils/-/schema-utils-0.4.5.tgz#21836f0608aac17b78f9e3e24daff14a5ca13a3e"
   dependencies:
@@ -7724,13 +7724,13 @@ uglify-to-browserify@~1.0.0:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/uglify-to-browserify/-/uglify-to-browserify-1.0.2.tgz#6e0924d6bda6b5afe349e39a6d632850a0f882b7"
 
-uglifyjs-webpack-plugin@^1.1.1:
-  version "1.2.2"
-  resolved "https://registry.yarnpkg.com/uglifyjs-webpack-plugin/-/uglifyjs-webpack-plugin-1.2.2.tgz#e7516d4367afdb715c3847841eb46f94c45ca2b9"
+uglifyjs-webpack-plugin@^1.2.4:
+  version "1.2.4"
+  resolved "https://registry.yarnpkg.com/uglifyjs-webpack-plugin/-/uglifyjs-webpack-plugin-1.2.4.tgz#5eec941b2e9b8538be0a20fc6eda25b14c7c1043"
   dependencies:
-    cacache "^10.0.1"
+    cacache "^10.0.4"
     find-cache-dir "^1.0.0"
-    schema-utils "^0.4.2"
+    schema-utils "^0.4.5"
     serialize-javascript "^1.4.0"
     source-map "^0.6.1"
     uglify-es "^3.3.4"
@@ -8125,9 +8125,9 @@ webpack-sources@^1.0.1, webpack-sources@^1.1.0:
     source-list-map "^2.0.0"
     source-map "~0.6.1"
 
-webpack@^4.1.0:
-  version "4.1.0"
-  resolved "https://registry.yarnpkg.com/webpack/-/webpack-4.1.0.tgz#91b6862e56eb3b18b79bb10b51866987ff10d2d6"
+webpack@^4.3.0:
+  version "4.3.0"
+  resolved "https://registry.yarnpkg.com/webpack/-/webpack-4.3.0.tgz#0b0c1e211311b3995dd25aed47ab46ea658be070"
   dependencies:
     acorn "^5.0.0"
     acorn-dynamic-import "^3.0.0"
@@ -8145,7 +8145,7 @@ webpack@^4.1.0:
     node-libs-browser "^2.0.0"
     schema-utils "^0.4.2"
     tapable "^1.0.0"
-    uglifyjs-webpack-plugin "^1.1.1"
+    uglifyjs-webpack-plugin "^1.2.4"
     watchpack "^1.5.0"
     webpack-sources "^1.0.1"