diff --git a/composer.json b/composer.json
index e975352..e7ba3a2 100644
--- a/composer.json
+++ b/composer.json
@@ -12,7 +12,7 @@
     ],
     "require":{
       "laravel/lumen-framework": "~5.1",
-      "psy/psysh":"~0.5.1"
+      "psy/psysh":"~0.5.1|~0.6.1"
     },
     "require-dev":{
       "phpunit/phpunit": "~4.0",