diff --git a/grid-app/terminal-server/package.json b/grid-app/terminal-server/package.json
index ebf04f7..ab81d6a 100644
--- a/grid-app/terminal-server/package.json
+++ b/grid-app/terminal-server/package.json
@@ -8,7 +8,7 @@
   "license": "ISC",
   "dependencies": {
     "express": "^4.16.2",
-    "express-ws": "^3.0.0",
+    "express-ws": "^4.0.0",
     "node-pty": "^0.7.4"
   }
 }