diff --git a/composer.json b/composer.json
index a656c20fe4b..712aca97614 100644
--- a/composer.json
+++ b/composer.json
@@ -35,7 +35,7 @@
         "phpunit/php-file-iterator": "^1.4.3",
         "phpunit/php-text-template": "^1.2.1",
         "phpunit/php-timer": "^2.0",
-        "phpunit/phpunit-mock-objects": "^6.1",
+        "phpunit/phpunit-mock-objects": "^6.1.1",
         "sebastian/comparator": "^2.1",
         "sebastian/diff": "^3.0",
         "sebastian/environment": "^3.1",