diff --git a/test/helpers/CopyPluginWithAssetInfo.js b/test/helpers/CopyPluginWithAssetInfo.js
index 7a4f84e..ebe4847 100644
--- a/test/helpers/CopyPluginWithAssetInfo.js
+++ b/test/helpers/CopyPluginWithAssetInfo.js
@@ -1,8 +1,7 @@
-import { RawSource } from "webpack-sources";
-
 export default class CopyPluginWithAssetInfo {
   apply(compiler) {
     const plugin = { name: this.constructor.name };
+    const { RawSource } = compiler.webpack.sources;
 
     compiler.hooks.thisCompilation.tap(plugin, (compilation) => {
       compilation.hooks.additionalAssets.tap(plugin, () => {
diff --git a/test/helpers/ModifyExistingAsset.js b/test/helpers/ModifyExistingAsset.js
index d17339c..08104ed 100644
--- a/test/helpers/ModifyExistingAsset.js
+++ b/test/helpers/ModifyExistingAsset.js
@@ -1,10 +1,3 @@
-import webpack from "webpack";
-
-// webpack 5 exposes the sources property to ensure the right version of webpack-sources is used
-const { ConcatSource } =
-  // eslint-disable-next-line global-require
-  webpack.sources || require("webpack-sources");
-
 export default class ExistingCommentsFile {
   constructor(options = {}) {
     this.options = options;
@@ -12,6 +5,7 @@ export default class ExistingCommentsFile {
 
   apply(compiler) {
     const plugin = { name: this.constructor.name };
+    const { ConcatSource } = compiler.webpack.sources;
 
     compiler.hooks.thisCompilation.tap(plugin, (compilation) => {
       compilation.hooks.additionalAssets.tap(plugin, () => {