diff --git a/scripts/test.js b/scripts/test.js
index 141c68c..8ae7840 100644
--- a/scripts/test.js
+++ b/scripts/test.js
@@ -10,7 +10,10 @@
 const getKarmaConfig = require( './utils/getkarmaconfig' );
 const { Server, config } = require( 'karma' );
 
-const parsedConfig = config.parseConfig( null, getKarmaConfig() );
-const server = new Server( parsedConfig );
+( async () => {
+	const parsedConfig = config.parseConfig( null, await getKarmaConfig() );
+	const server = new Server( parsedConfig );
+
+	server.start();
+} )();
 
-server.start();
diff --git a/scripts/utils/getkarmaconfig.js b/scripts/utils/getkarmaconfig.js
index d03f14e..d212fc5 100644
--- a/scripts/utils/getkarmaconfig.js
+++ b/scripts/utils/getkarmaconfig.js
@@ -10,11 +10,11 @@
 const path = require( 'path' );
 const options = parseArguments( process.argv.slice( 2 ) );
 
-module.exports = function getKarmaConfig() {
+module.exports = async function getKarmaConfig() {
 	const basePath = process.cwd();
 	const coverageDir = path.join( basePath, 'coverage' );
 
-	const webpackConfig = require( '../../webpack.config.js' )( {}, {
+	const webpackConfig = ( await import( '../../webpack.config.mjs' ) ).default( {}, {
 		mode: 'development'
 	} );