diff --git a/composer.json b/composer.json
index 23ab4a4..7fb5e60 100644
--- a/composer.json
+++ b/composer.json
@@ -35,7 +35,7 @@
     },
     "require-dev": {
         "vimeo/psalm": "~5.6",
-        "innmind/black-box": "~5.5",
+        "innmind/black-box": "~6.5",
         "innmind/coding-standard": "~2.0"
     },
     "provide": {