diff --git a/package.json b/package.json
index fd209bcd..0469d073 100644
--- a/package.json
+++ b/package.json
@@ -38,6 +38,6 @@
     "semantic-ui-less": "^2.2.4"
   },
   "dependencies": {
-    "pxt-core": "0.12.39"
+    "pxt-core": "0.12.40"
   }
 }