diff --git a/packages/test-utils/index.ts b/packages/test-utils/index.ts
index 3447b2f5..69ada950 100644
--- a/packages/test-utils/index.ts
+++ b/packages/test-utils/index.ts
@@ -12,16 +12,17 @@ export function startLanguageServer(serverModule: string, cwd?: string | URL) {
 
 	const childProcess = cp.fork(
 		serverModule,
-		['--node-ipc', `--clientProcessId=${process.pid.toString()}`],
+		['--stdio', `--clientProcessId=${process.pid.toString()}`],
 		{
 			execArgv: ['--nolazy'],
 			env: process.env,
 			cwd,
+			stdio: 'pipe',
 		}
 	);
 	const connection = _.createProtocolConnection(
-		new _.IPCMessageReader(childProcess),
-		new _.IPCMessageWriter(childProcess)
+		childProcess.stdout!,
+		childProcess.stdin!
 	);
 	const openedDocuments = new Map<string, TextDocument>();
 	const settings: any = {};
@@ -34,7 +35,7 @@ export function startLanguageServer(serverModule: string, cwd?: string | URL) {
 	connection.onUnhandledNotification(e => console.log(e));
 	connection.onError(e => console.log(e));
 	connection.onDispose(() => {
-		childProcess.kill();
+		connection.end();
 	});
 	connection.onRequest(_.ConfigurationRequest.type, ({ items }) => {
 		return items.map(item => {