diff --git a/bench/patches/v4/install_yarn.py b/bench/patches/v4/install_yarn.py
index a9ef438e..e29868e9 100644
--- a/bench/patches/v4/install_yarn.py
+++ b/bench/patches/v4/install_yarn.py
@@ -1,4 +1,5 @@
-import subprocess
+import os
+from bench.utils import exec_cmd
 
 def execute(bench_path):
-	subprocess.check_output(['sudo', 'npm', 'install', '-g', 'yarn'])
\ No newline at end of file
+	exec_cmd('npm install yarn', os.path.join(bench_path, 'apps/frappe'))
diff --git a/bench/utils.py b/bench/utils.py
index 6a2d77df..37f27853 100755
--- a/bench/utils.py
+++ b/bench/utils.py
@@ -434,7 +434,7 @@ def update_npm_packages(bench_path='.'):
 	for app in os.listdir(apps_dir):
 		app_path = os.path.join(apps_dir, app)
 		if os.path.exists(os.path.join(app_path, 'package.json')):
-			exec_cmd('yarn install', cwd=app_path)
+			exec_cmd('./node_modules/.bin/yarn install', cwd=app_path)
 
 
 def install_requirements(pip, req_file):