diff --git a/package.json b/package.json
index 624836ba..7e430120 100644
--- a/package.json
+++ b/package.json
@@ -41,6 +41,6 @@
     "@types/node": "8.0.53"
   },
   "dependencies": {
-    "pxt-core": "3.21.16"
+    "pxt-core": "3.21.6"
   }
 }