diff --git a/package.json b/package.json
index 5e56a7a8..7d2a25f8 100644
--- a/package.json
+++ b/package.json
@@ -57,7 +57,7 @@
     "eslint": "^9.32.0",
     "eslint-config-prettier": "^10.1.8",
     "eslint-plugin-svelte": "^3.11.0",
-    "happy-dom": "^18.0.1",
+    "happy-dom": "^20.0.0",
     "jsdom": "^26.1.0",
     "prettier": "^3.6.2",
     "prettier-plugin-svelte": "^3.4.0",