diff --git a/composer.json b/composer.json
index a3e0306c7..c9c379fe6 100644
--- a/composer.json
+++ b/composer.json
@@ -48,7 +48,7 @@
         "gabordemooij/redbean": "~4.3",
         "doctrine/annotations": "1.2.*",
         "symfony/expression-language": ">=2.7 <3.0",
-        "psy/psysh": "0.6|0.8"
+        "psy/psysh": "0.6.* || ~0.8"
     },
     "bin": ["bin/drupal"],
     "config": {