diff --git a/package-lock.json b/package-lock.json
index 51232284..3b8df913 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -16490,9 +16490,9 @@
       "dev": true
     },
     "webpack": {
-      "version": "4.44.1",
-      "resolved": "https://registry.npmjs.org/webpack/-/webpack-4.44.1.tgz",
-      "integrity": "sha512-4UOGAohv/VGUNQJstzEywwNxqX417FnjZgZJpJQegddzPmTvph37eBIRbRTfdySXzVtJXLJfbMN3mMYhM6GdmQ==",
+      "version": "4.44.2",
+      "resolved": "https://registry.npmjs.org/webpack/-/webpack-4.44.2.tgz",
+      "integrity": "sha512-6KJVGlCxYdISyurpQ0IPTklv+DULv05rs2hseIXer6D7KrUicRDLFb4IUM1S6LUAKypPM/nSiVSuv8jHu1m3/Q==",
       "dev": true,
       "requires": {
         "@webassemblyjs/ast": "1.9.0",
diff --git a/package.json b/package.json
index c9c0662b..cf442091 100644
--- a/package.json
+++ b/package.json
@@ -74,7 +74,7 @@
     "npm-run-all": "^4.1.5",
     "prettier": "^2.1.1",
     "standard-version": "^9.0.0",
-    "webpack": "^4.44.1",
+    "webpack": "^4.44.2",
     "webpack-cli": "^3.3.6",
     "webpack-dev-server": "^3.7.2"
   },
diff --git a/test/cases/split-chunks-all/a.js b/test/cases/split-chunks-all/a.js
new file mode 100644
index 00000000..aa3357bf
--- /dev/null
+++ b/test/cases/split-chunks-all/a.js
@@ -0,0 +1 @@
+import './style.css';
diff --git a/test/cases/split-chunks-all/b.js b/test/cases/split-chunks-all/b.js
new file mode 100644
index 00000000..aa3357bf
--- /dev/null
+++ b/test/cases/split-chunks-all/b.js
@@ -0,0 +1 @@
+import './style.css';
diff --git a/test/cases/split-chunks-all/expected/webpack-4/styles~a~b.css b/test/cases/split-chunks-all/expected/webpack-4/styles~a~b.css
new file mode 100644
index 00000000..cebc5c1c
--- /dev/null
+++ b/test/cases/split-chunks-all/expected/webpack-4/styles~a~b.css
@@ -0,0 +1,4 @@
+body {
+  background: red;
+}
+
diff --git a/test/cases/split-chunks-all/expected/webpack-5/2.css b/test/cases/split-chunks-all/expected/webpack-5/2.css
new file mode 100644
index 00000000..cebc5c1c
--- /dev/null
+++ b/test/cases/split-chunks-all/expected/webpack-5/2.css
@@ -0,0 +1,4 @@
+body {
+  background: red;
+}
+
diff --git a/test/cases/split-chunks-all/index.js b/test/cases/split-chunks-all/index.js
new file mode 100644
index 00000000..aa3357bf
--- /dev/null
+++ b/test/cases/split-chunks-all/index.js
@@ -0,0 +1 @@
+import './style.css';
diff --git a/test/cases/split-chunks-all/style.css b/test/cases/split-chunks-all/style.css
new file mode 100644
index 00000000..67ce83e4
--- /dev/null
+++ b/test/cases/split-chunks-all/style.css
@@ -0,0 +1,3 @@
+body {
+  background: red;
+}
diff --git a/test/cases/split-chunks-all/webpack.config.js b/test/cases/split-chunks-all/webpack.config.js
new file mode 100644
index 00000000..e9edc39b
--- /dev/null
+++ b/test/cases/split-chunks-all/webpack.config.js
@@ -0,0 +1,36 @@
+import webpack from 'webpack';
+
+import Self from '../../../src';
+
+module.exports = {
+  entry: {
+    a: './a.js',
+    b: './b.js',
+  },
+  module: {
+    rules: [
+      {
+        test: /\.css$/,
+        use: [Self.loader, 'css-loader'],
+      },
+    ],
+  },
+  optimization: {
+    splitChunks: {
+      cacheGroups: {
+        styles:
+          webpack.version[0] === '4'
+            ? {
+                chunks: 'all',
+                enforce: true,
+              }
+            : {
+                type: 'css/mini-extract',
+                chunks: 'all',
+                enforce: true,
+              },
+      },
+    },
+  },
+  plugins: [new Self()],
+};