diff --git a/packages/poml-browser/package-lock.json b/packages/poml-browser/package-lock.json
index eb29e52b..b0da41a2 100644
--- a/packages/poml-browser/package-lock.json
+++ b/packages/poml-browser/package-lock.json
@@ -48,7 +48,7 @@
         "chrome-types": "^0.1.367",
         "cross-env": "^10.0.0",
         "dompurify": "3.2.4",
-        "happy-dom": "^18.0.1",
+        "happy-dom": "^20.0.2",
         "marked": "14.1.2",
         "playwright": "^1.54.2",
         "postcss": "^8.5.6",
@@ -3295,9 +3295,9 @@
       "dev": true
     },
     "node_modules/happy-dom": {
-      "version": "18.0.1",
-      "resolved": "https://registry.npmjs.org/happy-dom/-/happy-dom-18.0.1.tgz",
-      "integrity": "sha512-qn+rKOW7KWpVTtgIUi6RVmTBZJSe2k0Db0vh1f7CWrWclkkc7/Q+FrOfkZIb2eiErLyqu5AXEzE7XthO9JVxRA==",
+      "version": "20.0.2",
+      "resolved": "https://registry.npmjs.org/happy-dom/-/happy-dom-20.0.2.tgz",
+      "integrity": "sha512-pYOyu624+6HDbY+qkjILpQGnpvZOusItCk+rvF5/V+6NkcgTKnbOldpIy22tBnxoaLtlM9nXgoqAcW29/B7CIw==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
diff --git a/packages/poml-browser/package.json b/packages/poml-browser/package.json
index c75097f1..49246f24 100644
--- a/packages/poml-browser/package.json
+++ b/packages/poml-browser/package.json
@@ -30,7 +30,7 @@
     "chrome-types": "^0.1.367",
     "cross-env": "^10.0.0",
     "dompurify": "3.2.4",
-    "happy-dom": "^18.0.1",
+    "happy-dom": "^20.0.2",
     "marked": "14.1.2",
     "playwright": "^1.54.2",
     "postcss": "^8.5.6",