diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 67d292d..2f3eecb 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -5,8 +5,6 @@ on: [push, pull_request]
 jobs:
   blackbox:
     uses: innmind/github-workflows/.github/workflows/black-box-matrix.yml@main
-    with:
-      scenarii: 20 # optional
   coverage:
     uses: innmind/github-workflows/.github/workflows/coverage-matrix.yml@main
     secrets: inherit
@@ -14,5 +12,3 @@ jobs:
     uses: innmind/github-workflows/.github/workflows/psalm-matrix.yml@main
   cs:
     uses: innmind/github-workflows/.github/workflows/cs.yml@main
-    with:
-      php-version: '8.2'
diff --git a/.github/workflows/extensive.yml b/.github/workflows/extensive.yml
new file mode 100644
index 0000000..257f139
--- /dev/null
+++ b/.github/workflows/extensive.yml
@@ -0,0 +1,12 @@
+name: Extensive CI
+
+on:
+  push:
+    tags:
+      - '*'
+    paths:
+      - '.github/workflows/extensive.yml'
+
+jobs:
+  blackbox:
+    uses: innmind/github-workflows/.github/workflows/extensive.yml@main
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 49a084d..e61a881 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [Unreleased]
+
+### Changed
+
+- Requires PHP `8.4`
+- Requires `innmind/filesystem:~9.0`
+
 ## 1.7.0 - 2025-04-14
 
 ### Added
diff --git a/blackbox.php b/blackbox.php
index 0e18e26..519ac78 100644
--- a/blackbox.php
+++ b/blackbox.php
@@ -10,6 +10,10 @@
 };
 
 Application::new($argv)
+    ->when(
+        \getenv('BLACKBOX_SET_SIZE') !== false,
+        static fn(Application $app) => $app->scenariiPerProof((int) \getenv('BLACKBOX_SET_SIZE')),
+    )
     ->when(
         \getenv('ENABLE_COVERAGE') !== false,
         static fn(Application $app) => $app
diff --git a/composer.json b/composer.json
index 8afccdf..e16636b 100644
--- a/composer.json
+++ b/composer.json
@@ -15,9 +15,9 @@
         "issues": "http://github.com/innmind/hash/issues"
     },
     "require": {
-        "php": "~8.2",
-        "innmind/immutable": "~4.5|~5.0",
-        "innmind/filesystem": "~7.0|~8.0"
+        "php": "~8.4",
+        "innmind/immutable": "~6.0",
+        "innmind/filesystem": "~9.0"
     },
     "autoload": {
         "psr-4": {
@@ -30,8 +30,8 @@
         }
     },
     "require-dev": {
-        "innmind/static-analysis": "^1.2.1",
-        "innmind/black-box": "~6.1",
+        "innmind/static-analysis": "~1.3",
+        "innmind/black-box": "~6.2",
         "innmind/coding-standard": "~2.0"
     }
 }
diff --git a/tests/FunctionalTest.php b/tests/FunctionalTest.php
index da62309..e5cc406 100644
--- a/tests/FunctionalTest.php
+++ b/tests/FunctionalTest.php
@@ -4,7 +4,7 @@
 namespace Tests\Innmind\Hash;
 
 use Innmind\Hash\Hash;
-use Innmind\Filesystem\Adapter\Filesystem;
+use Innmind\Filesystem\Adapter;
 use Innmind\Url\Path;
 use Innmind\BlackBox\{
     PHPUnit\BlackBox,
@@ -16,19 +16,20 @@ class FunctionalTest extends TestCase
 {
     use BlackBox;
 
-    public function testHash()
+    public function testHash(): BlackBox\Proof
     {
-        $files = Filesystem::mount(Path::of('fixtures/'))
+        $files = Adapter::mount(Path::of('fixtures/'))
+            ->unwrap()
             ->root()
             ->all()
             ->toList();
 
-        $this
+        return $this
             ->forAll(
                 Set::of(...Hash::cases()),
                 Set::of(...$files),
             )
-            ->then(function($hash, $file) {
+            ->prove(function($hash, $file) {
                 $this->assertSame(
                     \hash_file($hash->toString(), 'fixtures/'.$file->name()->toString()),
                     $hash->ofFile($file)->hex(),