diff --git a/package-lock.json b/package-lock.json
index 2f0ac38..19cfb79 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -13,7 +13,7 @@
         "@types/node": "^25.3.2",
         "@vitest/coverage-v8": "^4.0.18",
         "eslint": "^10.0.2",
-        "happy-dom": "^20.7.0",
+        "happy-dom": "^20.8.3",
         "typedoc": "^0.28.17",
         "typescript": "5.9.3",
         "vitest": "^4.0.7"
@@ -2582,9 +2582,9 @@
       }
     },
     "node_modules/happy-dom": {
-      "version": "20.7.0",
-      "resolved": "https://registry.npmjs.org/happy-dom/-/happy-dom-20.7.0.tgz",
-      "integrity": "sha512-hR/uLYQdngTyEfxnOoa+e6KTcfBFyc1hgFj/Cc144A5JJUuHFYqIEBDcD4FeGqUeKLRZqJ9eN9u7/GDjYEgS1g==",
+      "version": "20.8.3",
+      "resolved": "https://registry.npmjs.org/happy-dom/-/happy-dom-20.8.3.tgz",
+      "integrity": "sha512-lMHQRRwIPyJ70HV0kkFT7jH/gXzSI7yDkQFe07E2flwmNDFoWUTRMKpW2sglsnpeA7b6S2TJPp98EbQxai8eaQ==",
       "dev": true,
       "dependencies": {
         "@types/node": ">=20.0.0",
@@ -5347,9 +5347,9 @@
       "dev": true
     },
     "happy-dom": {
-      "version": "20.7.0",
-      "resolved": "https://registry.npmjs.org/happy-dom/-/happy-dom-20.7.0.tgz",
-      "integrity": "sha512-hR/uLYQdngTyEfxnOoa+e6KTcfBFyc1hgFj/Cc144A5JJUuHFYqIEBDcD4FeGqUeKLRZqJ9eN9u7/GDjYEgS1g==",
+      "version": "20.8.3",
+      "resolved": "https://registry.npmjs.org/happy-dom/-/happy-dom-20.8.3.tgz",
+      "integrity": "sha512-lMHQRRwIPyJ70HV0kkFT7jH/gXzSI7yDkQFe07E2flwmNDFoWUTRMKpW2sglsnpeA7b6S2TJPp98EbQxai8eaQ==",
       "dev": true,
       "requires": {
         "@types/node": ">=20.0.0",
diff --git a/package.json b/package.json
index d66646e..928dd7f 100644
--- a/package.json
+++ b/package.json
@@ -39,7 +39,7 @@
     "@types/node": "^25.3.2",
     "@vitest/coverage-v8": "^4.0.18",
     "eslint": "^10.0.2",
-    "happy-dom": "^20.7.0",
+    "happy-dom": "^20.8.3",
     "typedoc": "^0.28.17",
     "typescript": "5.9.3",
     "vitest": "^4.0.7"