diff --git a/README.md b/README.md
index 27dde707f55..251715629ea 100644
--- a/README.md
+++ b/README.md
@@ -91,8 +91,7 @@ This step is only required if you intend to make changes to pxt and/or
 pxt-common-packages repos. If all you want is serve a local Makecode, you can skip
 this step.
 ```
-npm link ../pxt
-npm link ../pxt-common-packages
+npm link ../pxt ../pxt-common-packages
 ```
 Note the above command assumes the folder structure of   
 ```
diff --git a/package.json b/package.json
index a90200c0f64..a0578273edb 100644
--- a/package.json
+++ b/package.json
@@ -32,7 +32,7 @@
         "docs/static/icons/favicon.ico"
     ],
     "devDependencies": {
-        "@types/dom-mediacapture-record": "^1.0.16",
+        "@types/dom-mediacapture-record": "1.0.20",
         "@types/marked": "0.3.0",
         "@types/node": "8.10.66",
         "@types/react": "16.4.7",