diff --git a/package.json b/package.json
index e7313d57..e61e63fb 100644
--- a/package.json
+++ b/package.json
@@ -29,6 +29,6 @@
     "typescript": "^1.8.7"
   },
   "dependencies": {
-    "pxt-core": "0.3.102"
+    "pxt-core": "0.4.2"
   }
 }