diff --git a/packages/create-rstack/template-app-lit-ts/package.json b/packages/create-rstack/template-app-lit-ts/package.json
index 8149ed54..a62c7743 100644
--- a/packages/create-rstack/template-app-lit-ts/package.json
+++ b/packages/create-rstack/template-app-lit-ts/package.json
@@ -18,7 +18,7 @@
   },
   "devDependencies": {
     "@types/node": "^26.6.4",
-    "happy-dom": "^20.14.5",
+    "happy-dom": "^21.0.1",
     "rstack": "^0.8.3",
     "typescript": "^7.0.2"
   }
diff --git a/packages/create-rstack/template-app-lit/package.json b/packages/create-rstack/template-app-lit/package.json
index 1ae5d24e..ad2f6597 100644
--- a/packages/create-rstack/template-app-lit/package.json
+++ b/packages/create-rstack/template-app-lit/package.json
@@ -17,7 +17,7 @@
     "lit": "^3.3.3"
   },
   "devDependencies": {
-    "happy-dom": "^20.14.5",
+    "happy-dom": "^21.0.1",
     "rstack": "^0.8.3"
   }
 }
diff --git a/packages/create-rstack/template-app-preact-ts/package.json b/packages/create-rstack/template-app-preact-ts/package.json
index f10be7a2..0fbd781d 100644
--- a/packages/create-rstack/template-app-preact-ts/package.json
+++ b/packages/create-rstack/template-app-preact-ts/package.json
@@ -21,7 +21,7 @@
     "@testing-library/jest-dom": "^7.0.1",
     "@testing-library/preact": "^3.2.4",
     "@types/node": "^26.6.4",
-    "happy-dom": "^20.14.5",
+    "happy-dom": "^21.0.1",
     "rstack": "^0.8.3",
     "typescript": "^7.0.2"
   }
diff --git a/packages/create-rstack/template-app-preact/package.json b/packages/create-rstack/template-app-preact/package.json
index 18172a07..7b43a0d0 100644
--- a/packages/create-rstack/template-app-preact/package.json
+++ b/packages/create-rstack/template-app-preact/package.json
@@ -20,7 +20,7 @@
     "@rsbuild/plugin-preact": "^2.1.0",
     "@testing-library/jest-dom": "^7.0.1",
     "@testing-library/preact": "^3.2.4",
-    "happy-dom": "^20.14.5",
+    "happy-dom": "^21.0.1",
     "rstack": "^0.8.3"
   }
 }
diff --git a/packages/create-rstack/template-app-react-ts/package.json b/packages/create-rstack/template-app-react-ts/package.json
index 77a9790f..d973df61 100644
--- a/packages/create-rstack/template-app-react-ts/package.json
+++ b/packages/create-rstack/template-app-react-ts/package.json
@@ -25,7 +25,7 @@
     "@types/node": "^26.6.4",
     "@types/react": "^19.3.0",
     "@types/react-dom": "^19.3.0",
-    "happy-dom": "^20.14.5",
+    "happy-dom": "^21.0.1",
     "rstack": "^0.8.3",
     "typescript": "^7.0.2"
   }
diff --git a/packages/create-rstack/template-app-react/package.json b/packages/create-rstack/template-app-react/package.json
index ff4db1d0..e2783c80 100644
--- a/packages/create-rstack/template-app-react/package.json
+++ b/packages/create-rstack/template-app-react/package.json
@@ -22,7 +22,7 @@
     "@testing-library/dom": "^10.4.2",
     "@testing-library/jest-dom": "^7.0.1",
     "@testing-library/react": "^16.3.3",
-    "happy-dom": "^20.14.5",
+    "happy-dom": "^21.0.1",
     "rstack": "^0.8.3"
   }
 }
diff --git a/packages/create-rstack/template-app-solid-ts/package.json b/packages/create-rstack/template-app-solid-ts/package.json
index 80808b80..f9cb56c0 100644
--- a/packages/create-rstack/template-app-solid-ts/package.json
+++ b/packages/create-rstack/template-app-solid-ts/package.json
@@ -22,7 +22,7 @@
     "@solidjs/testing-library": "^0.8.10",
     "@testing-library/jest-dom": "^7.0.1",
     "@types/node": "^26.6.4",
-    "happy-dom": "^20.14.5",
+    "happy-dom": "^21.0.1",
     "rstack": "^0.8.3",
     "typescript": "^7.0.2"
   }
diff --git a/packages/create-rstack/template-app-solid/package.json b/packages/create-rstack/template-app-solid/package.json
index 8e4cd912..22c4c802 100644
--- a/packages/create-rstack/template-app-solid/package.json
+++ b/packages/create-rstack/template-app-solid/package.json
@@ -21,7 +21,7 @@
     "@rsbuild/plugin-solid": "^1.2.2",
     "@solidjs/testing-library": "^0.8.10",
     "@testing-library/jest-dom": "^7.0.1",
-    "happy-dom": "^20.14.5",
+    "happy-dom": "^21.0.1",
     "rstack": "^0.8.3"
   }
 }
diff --git a/packages/create-rstack/template-app-svelte-ts/package.json b/packages/create-rstack/template-app-svelte-ts/package.json
index 02ab6cee..23bc611a 100644
--- a/packages/create-rstack/template-app-svelte-ts/package.json
+++ b/packages/create-rstack/template-app-svelte-ts/package.json
@@ -21,7 +21,7 @@
     "@testing-library/jest-dom": "^7.0.1",
     "@testing-library/svelte": "^5.4.2",
     "@types/node": "^26.6.4",
-    "happy-dom": "^20.14.5",
+    "happy-dom": "^21.0.1",
     "prettier-plugin-svelte": "^4.1.1",
     "rstack": "^0.8.3",
     "svelte-check": "^4.7.6",
diff --git a/packages/create-rstack/template-app-svelte/package.json b/packages/create-rstack/template-app-svelte/package.json
index 782f2895..3159feff 100644
--- a/packages/create-rstack/template-app-svelte/package.json
+++ b/packages/create-rstack/template-app-svelte/package.json
@@ -20,7 +20,7 @@
     "@rsbuild/plugin-svelte": "^2.0.1",
     "@testing-library/jest-dom": "^7.0.1",
     "@testing-library/svelte": "^5.4.2",
-    "happy-dom": "^20.14.5",
+    "happy-dom": "^21.0.1",
     "prettier-plugin-svelte": "^4.1.1",
     "rstack": "^0.8.3"
   }
diff --git a/packages/create-rstack/template-app-vanilla-ts/package.json b/packages/create-rstack/template-app-vanilla-ts/package.json
index fb96995e..7c10fdc2 100644
--- a/packages/create-rstack/template-app-vanilla-ts/package.json
+++ b/packages/create-rstack/template-app-vanilla-ts/package.json
@@ -17,7 +17,7 @@
     "@testing-library/dom": "^10.4.2",
     "@testing-library/jest-dom": "^7.0.1",
     "@types/node": "^26.6.4",
-    "happy-dom": "^20.14.5",
+    "happy-dom": "^21.0.1",
     "rstack": "^0.8.3",
     "typescript": "^7.0.2"
   }
diff --git a/packages/create-rstack/template-app-vanilla/package.json b/packages/create-rstack/template-app-vanilla/package.json
index d2554043..6d41354d 100644
--- a/packages/create-rstack/template-app-vanilla/package.json
+++ b/packages/create-rstack/template-app-vanilla/package.json
@@ -16,7 +16,7 @@
   "devDependencies": {
     "@testing-library/dom": "^10.4.2",
     "@testing-library/jest-dom": "^7.0.1",
-    "happy-dom": "^20.14.5",
+    "happy-dom": "^21.0.1",
     "rstack": "^0.8.3"
   }
 }
diff --git a/packages/create-rstack/template-app-vue-ts/package.json b/packages/create-rstack/template-app-vue-ts/package.json
index 7a4ce6b5..d4e1bc60 100644
--- a/packages/create-rstack/template-app-vue-ts/package.json
+++ b/packages/create-rstack/template-app-vue-ts/package.json
@@ -21,7 +21,7 @@
     "@testing-library/jest-dom": "^7.0.1",
     "@types/node": "^26.6.4",
     "@vue/test-utils": "^2.5.1",
-    "happy-dom": "^20.14.5",
+    "happy-dom": "^21.0.1",
     "rstack": "^0.8.3",
     "typescript": "^6.0.3",
     "vue-tsc": "^3.3.12"
diff --git a/packages/create-rstack/template-app-vue/package.json b/packages/create-rstack/template-app-vue/package.json
index 76c2df4c..f290ba08 100644
--- a/packages/create-rstack/template-app-vue/package.json
+++ b/packages/create-rstack/template-app-vue/package.json
@@ -20,7 +20,7 @@
     "@rsbuild/plugin-vue": "^2.0.1",
     "@testing-library/jest-dom": "^7.0.1",
     "@vue/test-utils": "^2.5.1",
-    "happy-dom": "^20.14.5",
+    "happy-dom": "^21.0.1",
     "rstack": "^0.8.3"
   }
 }
diff --git a/packages/create-rstack/template-lib-react-ts/package.json b/packages/create-rstack/template-lib-react-ts/package.json
index 3d2f55e9..28a694b1 100644
--- a/packages/create-rstack/template-lib-react-ts/package.json
+++ b/packages/create-rstack/template-lib-react-ts/package.json
@@ -30,7 +30,7 @@
     "@types/node": "^26.6.4",
     "@types/react": "^19.3.0",
     "@types/react-dom": "^19.3.0",
-    "happy-dom": "^20.14.5",
+    "happy-dom": "^21.0.1",
     "react": "^19.3.0",
     "react-dom": "^19.3.0",
     "rstack": "^0.8.3",
diff --git a/packages/create-rstack/template-lib-react/package.json b/packages/create-rstack/template-lib-react/package.json
index d002f5e5..4f49d50c 100644
--- a/packages/create-rstack/template-lib-react/package.json
+++ b/packages/create-rstack/template-lib-react/package.json
@@ -22,7 +22,7 @@
     "@testing-library/jest-dom": "^7.0.1",
     "@testing-library/react": "^16.3.3",
     "@types/react-dom": "^19.3.0",
-    "happy-dom": "^20.14.5",
+    "happy-dom": "^21.0.1",
     "react": "^19.3.0",
     "react-dom": "^19.3.0",
     "rstack": "^0.8.3"
diff --git a/packages/create-rstack/template-lib-solid-ts/package.json b/packages/create-rstack/template-lib-solid-ts/package.json
index cebefac1..1697f94b 100644
--- a/packages/create-rstack/template-lib-solid-ts/package.json
+++ b/packages/create-rstack/template-lib-solid-ts/package.json
@@ -29,7 +29,7 @@
     "@solidjs/testing-library": "^0.8.10",
     "@testing-library/jest-dom": "^7.0.1",
     "@types/node": "^26.6.4",
-    "happy-dom": "^20.14.5",
+    "happy-dom": "^21.0.1",
     "rstack": "^0.8.3",
     "solid-js": "^1.9.17",
     "typescript": "^7.0.2"
diff --git a/packages/create-rstack/template-lib-solid/package.json b/packages/create-rstack/template-lib-solid/package.json
index 1042d890..92c378a7 100644
--- a/packages/create-rstack/template-lib-solid/package.json
+++ b/packages/create-rstack/template-lib-solid/package.json
@@ -26,7 +26,7 @@
     "@rsbuild/plugin-solid": "^1.2.2",
     "@solidjs/testing-library": "^0.8.10",
     "@testing-library/jest-dom": "^7.0.1",
-    "happy-dom": "^20.14.5",
+    "happy-dom": "^21.0.1",
     "rstack": "^0.8.3",
     "solid-js": "^1.9.17"
   },
diff --git a/packages/create-rstack/template-lib-svelte-ts/package.json b/packages/create-rstack/template-lib-svelte-ts/package.json
index 3f411ac9..f277ff11 100644
--- a/packages/create-rstack/template-lib-svelte-ts/package.json
+++ b/packages/create-rstack/template-lib-svelte-ts/package.json
@@ -25,7 +25,7 @@
   "devDependencies": {
     "@rsbuild/plugin-svelte": "^2.0.1",
     "@types/node": "^26.6.4",
-    "happy-dom": "^20.14.5",
+    "happy-dom": "^21.0.1",
     "prettier-plugin-svelte": "^4.1.1",
     "rstack": "^0.8.3",
     "svelte": "^5.57.2",
diff --git a/packages/create-rstack/template-lib-svelte/package.json b/packages/create-rstack/template-lib-svelte/package.json
index add83bcb..b16be49e 100644
--- a/packages/create-rstack/template-lib-svelte/package.json
+++ b/packages/create-rstack/template-lib-svelte/package.json
@@ -18,7 +18,7 @@
   },
   "devDependencies": {
     "@rsbuild/plugin-svelte": "^2.0.1",
-    "happy-dom": "^20.14.5",
+    "happy-dom": "^21.0.1",
     "prettier-plugin-svelte": "^4.1.1",
     "rstack": "^0.8.3",
     "svelte": "^5.57.2"
diff --git a/packages/create-rstack/template-lib-vue-ts/package.json b/packages/create-rstack/template-lib-vue-ts/package.json
index 4bcefd93..cd398a02 100644
--- a/packages/create-rstack/template-lib-vue-ts/package.json
+++ b/packages/create-rstack/template-lib-vue-ts/package.json
@@ -27,7 +27,7 @@
     "@testing-library/jest-dom": "^7.0.1",
     "@types/node": "^26.6.4",
     "@vue/test-utils": "^2.5.1",
-    "happy-dom": "^20.14.5",
+    "happy-dom": "^21.0.1",
     "rstack": "^0.8.3",
     "typescript": "^6.0.3",
     "vue": "^3.5.43",
diff --git a/packages/create-rstack/template-lib-vue/package.json b/packages/create-rstack/template-lib-vue/package.json
index 24b3e0d9..f81d61d5 100644
--- a/packages/create-rstack/template-lib-vue/package.json
+++ b/packages/create-rstack/template-lib-vue/package.json
@@ -20,7 +20,7 @@
     "@rsbuild/plugin-vue": "^2.0.1",
     "@testing-library/jest-dom": "^7.0.1",
     "@vue/test-utils": "^2.5.1",
-    "happy-dom": "^20.14.5",
+    "happy-dom": "^21.0.1",
     "rstack": "^0.8.3",
     "vue": "^3.5.43"
   },
diff --git a/packages/create-rstack/template-turborepo/apps/web/package.json b/packages/create-rstack/template-turborepo/apps/web/package.json
index 056845d5..bd7666ea 100644
--- a/packages/create-rstack/template-turborepo/apps/web/package.json
+++ b/packages/create-rstack/template-turborepo/apps/web/package.json
@@ -22,6 +22,6 @@
     "@testing-library/react": "^16.3.3",
     "@types/react": "^19.3.0",
     "@types/react-dom": "^19.3.0",
-    "happy-dom": "^20.14.5"
+    "happy-dom": "^21.0.1"
   }
 }
diff --git a/packages/create-rstack/template-turborepo/packages/ui/package.json b/packages/create-rstack/template-turborepo/packages/ui/package.json
index 4af78f06..22f651c7 100644
--- a/packages/create-rstack/template-turborepo/packages/ui/package.json
+++ b/packages/create-rstack/template-turborepo/packages/ui/package.json
@@ -25,7 +25,7 @@
     "@testing-library/react": "^16.3.3",
     "@types/react": "^19.3.0",
     "@types/react-dom": "^19.3.0",
-    "happy-dom": "^20.14.5",
+    "happy-dom": "^21.0.1",
     "react-dom": "^19.3.0"
   }
 }
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 7682fbec..09ca9ba0 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -247,8 +247,8 @@ catalogs:
       specifier: 2.1.0
       version: 2.1.0
     happy-dom:
-      specifier: ^20.14.5
-      version: 20.14.5
+      specifier: ^21.0.1
+      version: 21.0.1
     heading-case:
       specifier: ^2.0.2
       version: 2.0.2
@@ -365,7 +365,7 @@ importers:
         version: 19.3.0(@types/react@19.3.0)
       happy-dom:
         specifier: 'catalog:'
-        version: 20.14.5
+        version: 21.0.1
       rstack:
         specifier: workspace:*
         version: link:../../packages/rstack
@@ -386,7 +386,7 @@ importers:
         version: 26.6.4
       happy-dom:
         specifier: 'catalog:'
-        version: 20.14.5
+        version: 21.0.1
       rstack:
         specifier: workspace:*
         version: link:../../packages/rstack
@@ -453,7 +453,7 @@ importers:
         version: 19.3.0(@types/react@19.3.0)
       happy-dom:
         specifier: 'catalog:'
-        version: 20.14.5
+        version: 21.0.1
       react:
         specifier: 'catalog:'
         version: 19.3.0
@@ -496,7 +496,7 @@ importers:
         version: 19.3.0(@types/react@19.3.0)
       happy-dom:
         specifier: 'catalog:'
-        version: 20.14.5
+        version: 21.0.1
       rstack:
         specifier: workspace:*
         version: link:../../packages/rstack
@@ -2456,6 +2456,10 @@ packages:
     resolution: {integrity: sha512-x/RzkpWO40bTjIoT30iQtt64FLLmH/iRcUCN2X//bLx7H3ifkdfPXyqsro/OYtqzIAhiLMMA7mmiOR9C3NOKjQ==}
     engines: {node: '>=20.0.0'}
 
+  happy-dom@21.0.1:
+    resolution: {integrity: sha512-pRBs/u9fhrncyByOl58DMex0R2uAj6ZPKWIjV5j5yNGZBqLw3P6BTRhlc0DD5b/Ht4/6JYTMuE2LJhUWRC6SGw==}
+    engines: {node: '>=20.0.0'}
+
   has-flag@4.0.0:
     resolution: {integrity: sha512-EykJT/Q1KjTWctppgIAgfSO0tKVuZUjhgMr17kqTumMl6Afv3EISleU7qZUzoXDFTAHTDC4NOoG/ZxU3EvlMPQ==}
     engines: {node: '>=8'}
@@ -5137,6 +5141,20 @@ snapshots:
     transitivePeerDependencies:
       - bufferutil
       - utf-8-validate
+    optional: true
+
+  happy-dom@21.0.1:
+    dependencies:
+      '@types/node': 26.6.4
+      '@types/whatwg-mimetype': 3.0.2
+      '@types/ws': 8.18.1
+      buffer-image-size: 0.6.4
+      entities: 7.0.1
+      whatwg-mimetype: 3.0.0
+      ws: 8.21.0
+    transitivePeerDependencies:
+      - bufferutil
+      - utf-8-validate
 
   has-flag@4.0.0: {}
 
diff --git a/pnpm-workspace.yaml b/pnpm-workspace.yaml
index c36f5a8c..be0345a0 100644
--- a/pnpm-workspace.yaml
+++ b/pnpm-workspace.yaml
@@ -41,7 +41,7 @@ catalog:
   '@shikijs/transformers': '^4.5.0'
   'cspell-ban-words': '^0.0.4'
   'fast-json-stable-stringify': '2.1.0'
-  'happy-dom': '^20.14.5'
+  'happy-dom': '^21.0.1'
   'heading-case': '^2.0.2'
   'import-meta-resolve': '4.2.0'
   is-binary-path: 3.0.0