diff --git a/package-lock.json b/package-lock.json
index 056edba..4b51386 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -15,7 +15,7 @@
         "@biomejs/biome": "^2.5.15",
         "@playwright/test": "^1.64.0",
         "@types/node": "^24.19.2",
-        "happy-dom": "^20.14.6",
+        "happy-dom": "^21.0.3",
         "png-to-ico": "^3.0.2",
         "sharp": "^0.35.5",
         "tsx": "^4.23.15",
@@ -5416,9 +5416,9 @@
       "license": "ISC"
     },
     "node_modules/happy-dom": {
-      "version": "20.14.6",
-      "resolved": "https://registry.npmjs.org/happy-dom/-/happy-dom-20.14.6.tgz",
-      "integrity": "sha512-5DDsf4QmEIlRL6NkCv/fxSjYHHkZceL/IaYQdJc2h3G7DRTEai++VTjbfL0LB9geW2VrA3+vrjF3Efx+OTtX0Q==",
+      "version": "21.0.3",
+      "resolved": "https://registry.npmjs.org/happy-dom/-/happy-dom-21.0.3.tgz",
+      "integrity": "sha512-PesNgu5BnIEmAwzKGewB3K1ORFeznFZJ4JrRz89ea1wkHnxskdpzX9sN/+zb4KO6k8oSMhyJSj/cwXAFrYBBNA==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
diff --git a/package.json b/package.json
index 2831ea2..c1fa8f3 100644
--- a/package.json
+++ b/package.json
@@ -50,7 +50,7 @@
     "@biomejs/biome": "^2.5.15",
     "@playwright/test": "^1.64.0",
     "@types/node": "^24.19.2",
-    "happy-dom": "^20.14.6",
+    "happy-dom": "^21.0.3",
     "png-to-ico": "^3.0.2",
     "sharp": "^0.35.5",
     "tsx": "^4.23.15",