diff --git a/packages/core/package.json b/packages/core/package.json
index a14c1f9465..1625284702 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -47,20 +47,17 @@
     "prop-types": "^15.7.2",
     "rc-progress": "^3.0.0",
     "react": "^16.12.0",
-    "react-addons-text-content": "0.0.4",
     "react-dom": "^16.12.0",
     "react-helmet": "6.0.0",
     "react-router": "^5.2.0",
     "react-router-dom": "^5.2.0",
     "react-sparklines": "^1.7.0",
     "react-syntax-highlighter": "^12.2.1",
-    "react-use": "^14.2.0",
-    "zen-observable": "^0.8.15"
+    "react-use": "^14.2.0"
   },
   "devDependencies": {
     "@backstage/cli": "^0.1.1-alpha.6",
     "@backstage/test-utils": "^0.1.1-alpha.6",
-    "@backstage/test-utils-core": "^0.1.1-alpha.6",
     "@testing-library/jest-dom": "^5.7.0",
     "@testing-library/react": "^9.3.2",
     "@testing-library/user-event": "^10.2.4",