diff --git a/editor/deploy.ts b/editor/deploy.ts
index 16f212be..3a4e24f4 100644
--- a/editor/deploy.ts
+++ b/editor/deploy.ts
@@ -59,8 +59,8 @@ class WebSerialPackageIO implements pxt.HF2.PacketIO {
                 let io = WebSerialPackageIO.portIos.filter(i => i.port == port)[0];
                 if (!io) {
                     const options: SerialOptions = {
-                        baudrate: 460800,
-                        buffersize: 4096
+                        baudRate: 460800,
+                        bufferSize: 4096
                     };
                     io = new WebSerialPackageIO(port, options);
                     WebSerialPackageIO.portIos.push(io);
diff --git a/package.json b/package.json
index dd7d5a7a..9a0aa71b 100644
--- a/package.json
+++ b/package.json
@@ -33,7 +33,7 @@
   ],
   "devDependencies": {
     "@types/bluebird": "2.0.33",
-    "@types/dom-serial": "0.1.0",
+    "@types/dom-serial": "^1.0.0",
     "@types/jquery": "3.5.1",
     "@types/marked": "0.3.0",
     "@types/node": "8.0.53",