diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5da1219..1a2b673 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Changelog
 
+## [Unreleased]
+
+### Added
+
+- Support for `innmind/black-box` `6`
+
 ## 2.2.0 - 2023-09-16
 
 ### Added
diff --git a/composer.json b/composer.json
index ae41167..8ee5c80 100644
--- a/composer.json
+++ b/composer.json
@@ -30,13 +30,13 @@
         }
     },
     "require-dev": {
-        "phpunit/phpunit": "~10.2",
-        "innmind/black-box": "~5.0",
+        "phpunit/phpunit": "~10.2|~11.0|~12.0",
+        "innmind/black-box": "~5.0|^6.0.1",
         "vimeo/psalm": "~5.6",
         "innmind/coding-standard": "~2.0"
     },
     "conflict": {
-        "innmind/black-box": "<5.0|~6.0"
+        "innmind/black-box": "<5.0|~7.0"
     },
     "suggest": {
         "innmind/black-box": "For property based testing"
diff --git a/tests/Fixtures/MediaTypeTest.php b/tests/Fixtures/MediaTypeTest.php
index 3d6aeb0..ab0a11d 100644
--- a/tests/Fixtures/MediaTypeTest.php
+++ b/tests/Fixtures/MediaTypeTest.php
@@ -24,7 +24,13 @@ public function testInterface()
 
         foreach ($set->values(Random::default) as $value) {
             $this->assertInstanceOf(Set\Value::class, $value);
-            $this->assertTrue($value->isImmutable());
+
+            if (\interface_exists(Set\Implementation::class)) {
+                $this->assertTrue($value->immutable());
+            } else {
+                $this->assertTrue($value->isImmutable());
+            }
+
             $this->assertInstanceOf(Model::class, $value->unwrap());
         }
     }