diff --git a/composer.json b/composer.json
index b626116..c519f3b 100644
--- a/composer.json
+++ b/composer.json
@@ -16,6 +16,6 @@
         }
     },
     "require": {
-        "phpspec/phpspec": "2.*"
+        "phpspec/phpspec": "~5.1"
     }
 }