diff --git a/package.json b/package.json
index 3f53f1e3..ee1481d1 100644
--- a/package.json
+++ b/package.json
@@ -95,7 +95,7 @@
 		"semantic-release": "^25.0.3",
 		"ts-jest": "29.4.12",
 		"typescript": "^5.6.2",
-		"vite": "^5.4.10",
+		"vite": "^6.4.5",
 		"vite-plugin-dts": "^4.5.4"
 	},
 	"dependencies": {
diff --git a/test-package.js b/test-package.js
index 06ebb236..2e62722f 100644
--- a/test-package.js
+++ b/test-package.js
@@ -342,7 +342,7 @@ const checkUmdGlobalMappings = () => {
 
 		const iifeArgCount = iifeArgs.split(",").length;
 
-		const factoryMatch = fd.match(/\}\)\([^,]+,function\(([^)]*)\)/);
+		const factoryMatch = fd.match(/\}\)\([^,]+,\(?function\(([^)]*)\)/);
 		if (!factoryMatch) {
 			errors.push(`${bundlePath}: Could not parse factory function signature.`);
 			continue;