diff --git a/package.json b/package.json
index a099142..0955ea6 100644
--- a/package.json
+++ b/package.json
@@ -122,7 +122,7 @@
         "copy": "^0.3.2",
         "eslint": "^9.37.0",
         "globals": "^16.4.0",
-        "happy-dom": "^19.0.2",
+        "happy-dom": "^20.0.0",
         "typescript": "^5.9.3",
         "vite": "^7.1.9",
         "vite-plugin-externalize-deps": "^0.10.0",