diff --git a/upgrade.py b/upgrade.py
index ff5621b..c103ef5 100644
--- a/upgrade.py
+++ b/upgrade.py
@@ -28,6 +28,7 @@ powershell.run_command('git pull ' + git_url_lib + ' master', session_server_lib
 # install node_modules
 session_server_root_dir = deploy_path + '/pixel-streaming-session-server'
 powershell.run_command('npm install', session_server_root_dir)
+powershell.run_command('npm install', deploy_path + '/pixel-streaming-webrtc/WebServers/')
 powershell.run_command('npm install', deploy_path + '/pixel-streaming-webrtc/WebServers/SignallingWebServer')
 powershell.run_command('npm install', deploy_path + '/pixel-streaming-webrtc/WebServers/SFU')