diff --git a/package.json b/package.json
index 687cdf7dadc..192b9a9f895 100644
--- a/package.json
+++ b/package.json
@@ -71,8 +71,10 @@
     "@glimmer/program": "0.84.2",
     "@glimmer/reference": "0.84.2",
     "@glimmer/runtime": "0.84.2",
+    "@glimmer/syntax": "0.84.2",
     "@glimmer/validator": "0.84.2",
     "@glimmer/vm-babel-plugins": "0.84.2",
+    "@simple-dom/interface": "^1.4.0",
     "babel-plugin-debug-macros": "^0.3.4",
     "babel-plugin-filter-imports": "^4.0.0",
     "backburner.js": "^2.7.0",