diff --git a/package.json b/package.json
index f4761701..45105488 100644
--- a/package.json
+++ b/package.json
@@ -49,7 +49,7 @@
   "devDependencies": {
     "@aptre/common": "^0.22.10",
     "depcheck": "^1.4.7",
-    "happy-dom": "^18.0.0",
+    "happy-dom": "^20.0.0",
     "prettier": "^3.5.3",
     "rimraf": "^6.0.1",
     "typescript": "^5.8.3",
diff --git a/yarn.lock b/yarn.lock
index 1721bb12..ee0ecd51 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1588,10 +1588,10 @@ graphemer@^1.4.0:
   resolved "https://registry.yarnpkg.com/graphemer/-/graphemer-1.4.0.tgz#fb2f1d55e0e3a1849aeffc90c4fa0dd53a0e66c6"
   integrity sha512-EtKwoO6kxCL9WO5xipiHTZlSzBm7WLT627TqC/uVRd0HKmq8NXyebnNYxDoBi7wt8eTWrUrKXCOVaFq9x1kgag==
 
-happy-dom@^18.0.0:
-  version "18.0.1"
-  resolved "https://registry.yarnpkg.com/happy-dom/-/happy-dom-18.0.1.tgz#8f8a2199462842deb675f54e405af55f3b674540"
-  integrity sha512-qn+rKOW7KWpVTtgIUi6RVmTBZJSe2k0Db0vh1f7CWrWclkkc7/Q+FrOfkZIb2eiErLyqu5AXEzE7XthO9JVxRA==
+happy-dom@^20.0.0:
+  version "20.0.0"
+  resolved "https://registry.yarnpkg.com/happy-dom/-/happy-dom-20.0.0.tgz#7f4dcaf5eb828e697d5a6fee9dd7631814cd40e2"
+  integrity sha512-GkWnwIFxVGCf2raNrxImLo397RdGhLapj5cT3R2PT7FwL62Ze1DROhzmYW7+J3p9105DYMVenEejEbnq5wA37w==
   dependencies:
     "@types/node" "^20.0.0"
     "@types/whatwg-mimetype" "^3.0.2"