--- a/package.json
+++ b/package.json
@@ -158,9 +158,7 @@
     "temporal": "latest"
   },
   "optionalDependencies": {
-    "browser-serialport": "latest",
-    "firmata": "^2.2.0",
-    "serialport": "^8.0.5"
+    "browser-serialport": "latest"
   },
   "devDependencies": {
     "async": "^2.6.1",