diff --git a/webapp/package-lock.json b/webapp/package-lock.json
index 5fc7608d..7b84f5a1 100644
--- a/webapp/package-lock.json
+++ b/webapp/package-lock.json
@@ -38,7 +38,7 @@
 				"@types/node": "^24.2.0",
 				"@vitest/ui": "^3.2.4",
 				"autoprefixer": "^10.4.16",
-				"happy-dom": "^18.0.1",
+				"happy-dom": "^20.0.0",
 				"jsdom": "^26.1.0",
 				"postcss": "^8.4.32",
 				"svelte": "^5.38.0",
@@ -3767,9 +3767,9 @@
 			"license": "ISC"
 		},
 		"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": "20.0.0",
+			"resolved": "https://registry.npmjs.org/happy-dom/-/happy-dom-20.0.0.tgz",
+			"integrity": "sha512-GkWnwIFxVGCf2raNrxImLo397RdGhLapj5cT3R2PT7FwL62Ze1DROhzmYW7+J3p9105DYMVenEejEbnq5wA37w==",
 			"dev": true,
 			"license": "MIT",
 			"dependencies": {
diff --git a/webapp/package.json b/webapp/package.json
index b9e915bf..e7229f80 100644
--- a/webapp/package.json
+++ b/webapp/package.json
@@ -26,7 +26,7 @@
 		"@types/node": "^24.2.0",
 		"@vitest/ui": "^3.2.4",
 		"autoprefixer": "^10.4.16",
-		"happy-dom": "^18.0.1",
+		"happy-dom": "^20.0.0",
 		"jsdom": "^26.1.0",
 		"postcss": "^8.4.32",
 		"svelte": "^5.38.0",