diff --git a/package-lock.json b/package-lock.json
index 7339fdd..c9a0bff 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -13,7 +13,7 @@
         "@types/node": "^25.0.10",
         "@vitest/coverage-v8": "^4.0.18",
         "eslint": "^9.39.2",
-        "happy-dom": "^20.3.7",
+        "happy-dom": "^20.4.0",
         "typedoc": "^0.28.16",
         "typescript": "5.9.3",
         "vitest": "^4.0.7"
@@ -2539,9 +2539,9 @@
       }
     },
     "node_modules/happy-dom": {
-      "version": "20.3.7",
-      "resolved": "https://registry.npmjs.org/happy-dom/-/happy-dom-20.3.7.tgz",
-      "integrity": "sha512-sb5IzoRl1WJKsUSRe+IloJf3z1iDq5PQ7Yk/ULMsZ5IAQEs9ZL7RsFfiKBXU7nK9QmO+iz0e59EH8r8jexTZ/g==",
+      "version": "20.4.0",
+      "resolved": "https://registry.npmjs.org/happy-dom/-/happy-dom-20.4.0.tgz",
+      "integrity": "sha512-RDeQm3dT9n0A5f/TszjUmNCLEuPnMGv3Tv4BmNINebz/h17PA6LMBcxJ5FrcqltNBMh9jA/8ufgDdBYUdBt+eg==",
       "dev": true,
       "dependencies": {
         "@types/node": ">=20.0.0",
@@ -5392,9 +5392,9 @@
       "dev": true
     },
     "happy-dom": {
-      "version": "20.3.7",
-      "resolved": "https://registry.npmjs.org/happy-dom/-/happy-dom-20.3.7.tgz",
-      "integrity": "sha512-sb5IzoRl1WJKsUSRe+IloJf3z1iDq5PQ7Yk/ULMsZ5IAQEs9ZL7RsFfiKBXU7nK9QmO+iz0e59EH8r8jexTZ/g==",
+      "version": "20.4.0",
+      "resolved": "https://registry.npmjs.org/happy-dom/-/happy-dom-20.4.0.tgz",
+      "integrity": "sha512-RDeQm3dT9n0A5f/TszjUmNCLEuPnMGv3Tv4BmNINebz/h17PA6LMBcxJ5FrcqltNBMh9jA/8ufgDdBYUdBt+eg==",
       "dev": true,
       "requires": {
         "@types/node": ">=20.0.0",
diff --git a/package.json b/package.json
index c66810b..8b845ca 100644
--- a/package.json
+++ b/package.json
@@ -39,7 +39,7 @@
     "@types/node": "^25.0.10",
     "@vitest/coverage-v8": "^4.0.18",
     "eslint": "^9.39.2",
-    "happy-dom": "^20.3.7",
+    "happy-dom": "^20.4.0",
     "typedoc": "^0.28.16",
     "typescript": "5.9.3",
     "vitest": "^4.0.7"