diff --git a/package-lock.json b/package-lock.json
index e7b1d08..cfe3777 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -21,7 +21,7 @@
         "@types/node": "^25.5.0",
         "@vitest/coverage-v8": "^4.1.2",
         "eslint": "^9.39.2",
-        "happy-dom": "^20.8.4",
+        "happy-dom": "^20.8.9",
         "typescript": "^5.9.3",
         "vite": "^7.3.1",
         "vitest": "^4.0.7"
@@ -4683,9 +4683,9 @@
       "license": "ISC"
     },
     "node_modules/happy-dom": {
-      "version": "20.8.4",
-      "resolved": "https://registry.npmjs.org/happy-dom/-/happy-dom-20.8.4.tgz",
-      "integrity": "sha512-GKhjq4OQCYB4VLFBzv8mmccUadwlAusOZOI7hC1D9xDIT5HhzkJK17c4el2f6R6C715P9xB4uiMxeKUa2nHMwQ==",
+      "version": "20.8.9",
+      "resolved": "https://registry.npmjs.org/happy-dom/-/happy-dom-20.8.9.tgz",
+      "integrity": "sha512-Tz23LR9T9jOGVZm2x1EPdXqwA37G/owYMxRwU0E4miurAtFsPMQ1d2Jc2okUaSjZqAFz2oEn3FLXC5a0a+siyA==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
diff --git a/package.json b/package.json
index 2bebe60..babc205 100644
--- a/package.json
+++ b/package.json
@@ -60,7 +60,7 @@
     "@types/node": "^25.5.0",
     "@vitest/coverage-v8": "^4.1.2",
     "eslint": "^9.39.2",
-    "happy-dom": "^20.8.4",
+    "happy-dom": "^20.8.9",
     "typescript": "^5.9.3",
     "vite": "^7.3.1",
     "vitest": "^4.0.7"