diff --git a/package-lock.json b/package-lock.json
index 22be037..bceb759 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -13,7 +13,7 @@
         "@types/node": "^25.6.0",
         "@vitest/coverage-v8": "^4.1.4",
         "eslint": "^10.2.0",
-        "happy-dom": "^20.8.9",
+        "happy-dom": "^20.9.0",
         "typedoc": "^0.28.19",
         "typescript": "5.9.3",
         "vitest": "^4.0.7"
@@ -1986,9 +1986,9 @@
       }
     },
     "node_modules/happy-dom": {
-      "version": "20.8.9",
-      "resolved": "https://registry.npmjs.org/happy-dom/-/happy-dom-20.8.9.tgz",
-      "integrity": "sha512-Tz23LR9T9jOGVZm2x1EPdXqwA37G/owYMxRwU0E4miurAtFsPMQ1d2Jc2okUaSjZqAFz2oEn3FLXC5a0a+siyA==",
+      "version": "20.9.0",
+      "resolved": "https://registry.npmjs.org/happy-dom/-/happy-dom-20.9.0.tgz",
+      "integrity": "sha512-GZZ9mKe8r646NUAf/zemnGbjYh4Bt8/MqASJY+pSm5ZDtc3YQox+4gsLI7yi1hba6o+eCsGxpHn5+iEVn31/FQ==",
       "dev": true,
       "dependencies": {
         "@types/node": ">=20.0.0",
@@ -4763,9 +4763,9 @@
       "dev": true
     },
     "happy-dom": {
-      "version": "20.8.9",
-      "resolved": "https://registry.npmjs.org/happy-dom/-/happy-dom-20.8.9.tgz",
-      "integrity": "sha512-Tz23LR9T9jOGVZm2x1EPdXqwA37G/owYMxRwU0E4miurAtFsPMQ1d2Jc2okUaSjZqAFz2oEn3FLXC5a0a+siyA==",
+      "version": "20.9.0",
+      "resolved": "https://registry.npmjs.org/happy-dom/-/happy-dom-20.9.0.tgz",
+      "integrity": "sha512-GZZ9mKe8r646NUAf/zemnGbjYh4Bt8/MqASJY+pSm5ZDtc3YQox+4gsLI7yi1hba6o+eCsGxpHn5+iEVn31/FQ==",
       "dev": true,
       "requires": {
         "@types/node": ">=20.0.0",
diff --git a/package.json b/package.json
index d4c6376..3c667bc 100644
--- a/package.json
+++ b/package.json
@@ -39,7 +39,7 @@
     "@types/node": "^25.6.0",
     "@vitest/coverage-v8": "^4.1.4",
     "eslint": "^10.2.0",
-    "happy-dom": "^20.8.9",
+    "happy-dom": "^20.9.0",
     "typedoc": "^0.28.19",
     "typescript": "5.9.3",
     "vitest": "^4.0.7"