diff --git a/packages/dev-server-core/package.json b/packages/dev-server-core/package.json
index a30fa9de5..9f7d98ac3 100644
--- a/packages/dev-server-core/package.json
+++ b/packages/dev-server-core/package.json
@@ -57,7 +57,8 @@
     "mime-types": "^2.1.27",
     "parse5": "^6.0.0",
     "picomatch": "^2.2.2",
-    "ws": "^7.3.1"
+    "ws": "^7.3.1",
+    "@web/parse5-utils": "^1.0.0"
   },
   "devDependencies": {
     "@types/clone": "^0.1.30",