diff --git a/packages/ui-mocks/package.json b/packages/ui-mocks/package.json
index 31b281d..f4b93e3 100644
--- a/packages/ui-mocks/package.json
+++ b/packages/ui-mocks/package.json
@@ -21,7 +21,7 @@
     "@testing-library/react": "16.0.1",
     "@types/react": "18.3.12",
     "@types/react-dom": "18.3.1",
-    "happy-dom": "15.7.4",
+    "happy-dom": "20.8.9",
     "typescript": "5.6.3",
     "vitest": "2.1.4"
   }