diff --git a/package-lock.json b/package-lock.json
index 264fc37..fdd3df0 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,7 +10,7 @@
       "devDependencies": {
         "@tailwindcss/cli": "4.3.3",
         "esbuild": "0.28.2",
-        "happy-dom": "20.11.6",
+        "happy-dom": "21.0.4",
         "tailwindcss": "4.3.3"
       }
     },
@@ -1343,9 +1343,9 @@
       "license": "ISC"
     },
     "node_modules/happy-dom": {
-      "version": "20.11.6",
-      "resolved": "https://registry.npmjs.org/happy-dom/-/happy-dom-20.11.6.tgz",
-      "integrity": "sha512-Hldbg8AdAa5a5oDcZpjqnGitp7JB0hqWmfv/8qr+kft4vzSD8BHsbdRfzYvL/0QcbKcURC/yyoygbeDQarPvYg==",
+      "version": "21.0.4",
+      "resolved": "https://registry.npmjs.org/happy-dom/-/happy-dom-21.0.4.tgz",
+      "integrity": "sha512-tFm+GaLBgo6o0awHnvHaNoraVo27qJ+2tZEtZ+cIa08hXbeitrxAJajLI05hsUy/2/YTKcUjQYzHe5mCcraLBw==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
diff --git a/package.json b/package.json
index fe730e3..1cdbd0c 100644
--- a/package.json
+++ b/package.json
@@ -6,7 +6,7 @@
   "devDependencies": {
     "@tailwindcss/cli": "4.3.3",
     "esbuild": "0.28.2",
-    "happy-dom": "20.11.6",
+    "happy-dom": "21.0.4",
     "tailwindcss": "4.3.3"
   }
 }
diff --git a/src/filament-runtime/package-lock.json b/src/filament-runtime/package-lock.json
index 272db29..0cd0876 100644
--- a/src/filament-runtime/package-lock.json
+++ b/src/filament-runtime/package-lock.json
@@ -10,7 +10,7 @@
       "license": "MIT",
       "devDependencies": {
         "esbuild": "^0.28.0",
-        "happy-dom": "^20.0.0",
+        "happy-dom": "^21.0.0",
         "typescript": "^5.9.3",
         "vitest": "^4.0.0"
       }
@@ -1198,9 +1198,9 @@
       }
     },
     "node_modules/happy-dom": {
-      "version": "20.11.6",
-      "resolved": "https://registry.npmjs.org/happy-dom/-/happy-dom-20.11.6.tgz",
-      "integrity": "sha512-Hldbg8AdAa5a5oDcZpjqnGitp7JB0hqWmfv/8qr+kft4vzSD8BHsbdRfzYvL/0QcbKcURC/yyoygbeDQarPvYg==",
+      "version": "21.0.4",
+      "resolved": "https://registry.npmjs.org/happy-dom/-/happy-dom-21.0.4.tgz",
+      "integrity": "sha512-tFm+GaLBgo6o0awHnvHaNoraVo27qJ+2tZEtZ+cIa08hXbeitrxAJajLI05hsUy/2/YTKcUjQYzHe5mCcraLBw==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
diff --git a/src/filament-runtime/package.json b/src/filament-runtime/package.json
index d76e697..f9bcb55 100644
--- a/src/filament-runtime/package.json
+++ b/src/filament-runtime/package.json
@@ -27,7 +27,7 @@
   },
   "devDependencies": {
     "esbuild": "^0.28.0",
-    "happy-dom": "^20.0.0",
+    "happy-dom": "^21.0.0",
     "typescript": "^5.9.3",
     "vitest": "^4.0.0"
   }