diff --git a/packages/base-manager/test/webpack-cov.conf.js b/packages/base-manager/test/webpack-cov.conf.js
index ce990f4c40e..0e84a42c20c 100644
--- a/packages/base-manager/test/webpack-cov.conf.js
+++ b/packages/base-manager/test/webpack-cov.conf.js
@@ -12,7 +12,7 @@ module.exports = {
     loaders: [
       { test: /\.json$/, loader: 'json-loader' },
       { test: /\.ipynb$/, loader: 'json-loader' },
-      { test: /\.css$/, loader: 'style-loader!css-loader' },
+      { test: /\.css$/, use: ['style-loader', 'css-loader'] },
       { test: /\.md$/, loader: 'raw-loader' },
       { test: /\.html$/, loader: 'file?name=[name].[ext]' }
     ],
diff --git a/packages/base-manager/test/webpack.conf.js b/packages/base-manager/test/webpack.conf.js
index 0f102497d91..85c0249f852 100644
--- a/packages/base-manager/test/webpack.conf.js
+++ b/packages/base-manager/test/webpack.conf.js
@@ -10,7 +10,7 @@ module.exports = {
   bail: true,
   module: {
     rules: [
-      { test: /\.css$/, loader: 'style-loader!css-loader' },
+      { test: /\.css$/, use: ['style-loader', 'css-loader'] },
       { test: /\.md$/, loader: 'raw-loader' },
       { test: /\.html$/, loader: 'file?name=[name].[ext]' },
       { test: /\.ipynb$/, loader: 'json-loader' }