diff --git a/package-lock.json b/package-lock.json
index b5887f0..f987a1b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -18,7 +18,7 @@
         "@types/node": "^25.0.9",
         "@vitest/coverage-v8": "^4.0.16",
         "eslint": "^9.29.0",
-        "happy-dom": "^20.1.0",
+        "happy-dom": "^20.3.1",
         "typedoc": "^0.28.15",
         "typescript": "^5.9.3",
         "vitest": "^4.0.7"
@@ -2983,9 +2983,9 @@
       "license": "MIT"
     },
     "node_modules/happy-dom": {
-      "version": "20.1.0",
-      "resolved": "https://registry.npmjs.org/happy-dom/-/happy-dom-20.1.0.tgz",
-      "integrity": "sha512-ebvqjBqzenBk2LjzNEAzoj7yhw7rW/R2/wVevMu6Mrq3MXtcI/RUz4+ozpcOcqVLEWPqLfg2v9EAU7fFXZUUJw==",
+      "version": "20.3.1",
+      "resolved": "https://registry.npmjs.org/happy-dom/-/happy-dom-20.3.1.tgz",
+      "integrity": "sha512-tLvsizNno05Hij0PoB0QN/S8xf0YU2AGvO11/JlJDw5McA/gzyn0Ni1RwbTI1/zteUbOekJH0t6q8HFvjbxsGg==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
diff --git a/package.json b/package.json
index 19513fd..b0e9c35 100644
--- a/package.json
+++ b/package.json
@@ -54,7 +54,7 @@
     "@types/node": "^25.0.9",
     "@vitest/coverage-v8": "^4.0.16",
     "eslint": "^9.29.0",
-    "happy-dom": "^20.1.0",
+    "happy-dom": "^20.3.1",
     "typedoc": "^0.28.15",
     "typescript": "^5.9.3",
     "vitest": "^4.0.7"