diff --git a/package-lock.json b/package-lock.json
index c92c3c3..1167b47 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -14,7 +14,7 @@
       },
       "devDependencies": {
         "@playwright/test": "^1.52.0",
-        "happy-dom": "^20.7.0",
+        "happy-dom": "^20.8.4",
         "pixelmatch": "^7.1.0",
         "pngjs": "^7.0.0",
         "vite": "^7.3.1",
@@ -1271,9 +1271,9 @@
       }
     },
     "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": "20.8.4",
+      "resolved": "https://registry.npmjs.org/happy-dom/-/happy-dom-20.8.4.tgz",
+      "integrity": "sha512-GKhjq4OQCYB4VLFBzv8mmccUadwlAusOZOI7hC1D9xDIT5HhzkJK17c4el2f6R6C715P9xB4uiMxeKUa2nHMwQ==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
diff --git a/package.json b/package.json
index 981dfc7..8758340 100644
--- a/package.json
+++ b/package.json
@@ -18,7 +18,7 @@
   },
   "devDependencies": {
     "@playwright/test": "^1.52.0",
-    "happy-dom": "^20.7.0",
+    "happy-dom": "^20.8.4",
     "pixelmatch": "^7.1.0",
     "pngjs": "^7.0.0",
     "vite": "^7.3.1",