diff --git a/composer.json b/composer.json
index 71cb657..3610107 100644
--- a/composer.json
+++ b/composer.json
@@ -21,7 +21,7 @@
     },
     "require": {
         "php": "^7.1",
-        "phpspec/phpspec": "^5.0",
+        "phpspec/phpspec": "^5.0 | ^6.0",
         "phpspec/prophecy": "^1.6"
     },
     "require-dev": {