diff --git a/package-lock.json b/package-lock.json
index bc94cd2..adf46aa 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -586,9 +586,9 @@
       }
     },
     "pubsub-js": {
-      "version": "1.9.2",
-      "resolved": "https://registry.npmjs.org/pubsub-js/-/pubsub-js-1.9.2.tgz",
-      "integrity": "sha512-t+djzDvEKv4GoP5nPJ5Ar5h+4MrwPw+C9/9l75GV8TzO49HezXnxR1G6E/QJZdE2EDsXRNMu6O9MFjpjkSV7zg=="
+      "version": "1.9.4",
+      "resolved": "https://registry.npmjs.org/pubsub-js/-/pubsub-js-1.9.4.tgz",
+      "integrity": "sha512-hJYpaDvPH4w8ZX/0Fdf9ma1AwRgU353GfbaVfPjfJQf1KxZ2iHaHl3fAUw1qlJIR5dr4F3RzjGaWohYUEyoh7A=="
     },
     "qs": {
       "version": "6.7.0",
diff --git a/package.json b/package.json
index 1d516d4..8b9e807 100644
--- a/package.json
+++ b/package.json
@@ -15,7 +15,7 @@
     "mathjs": "^5.6.0",
     "morgan": "~1.10.0",
     "phidget22": "^2.0.11",
-    "pubsub-js": "^1.9.2",
+    "pubsub-js": "^1.9.4",
     "socket.io": "^2.2.0"
   }
 }