diff --git a/composer.json b/composer.json
index aa09726..f8e69ce 100644
--- a/composer.json
+++ b/composer.json
@@ -31,7 +31,7 @@
 	"require-dev" : {
 		"phpunit/phpunit": "^7",
 		"spatie/phpunit-watcher": "^1.23",
-		"yoast/phpunit-polyfills": "^1.0"
+		"yoast/phpunit-polyfills": "^1.1"
 	},
 	"scripts"    : {
 		"test": "phpunit",