diff --git a/package.json b/package.json
index 9a0757996..be292f683 100644
--- a/package.json
+++ b/package.json
@@ -14,7 +14,7 @@
     "@types/node": "^9.6.56",
     "@types/node-fetch": "^1.6.9",
     "@types/webidl2": "^23.12.1",
-    "cpx2": "^2.0.0",
+    "cpx2": "^4.2.0",
     "jsdom": "^11.12.0",
     "node-fetch": "^2.6.0",
     "print-diff": "^0.1.1",