diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index fa48d86..9e4a616 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -8,7 +8,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macOS-latest]
-        php-version: ['8.1', '8.2', '8.3']
+        php-version: ['8.2', '8.3']
         dependencies: ['lowest', 'highest']
     name: 'PHPUnit'
     steps:
@@ -33,7 +33,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        php-version: ['8.1', '8.2', '8.3']
+        php-version: ['8.2', '8.3']
         dependencies: ['lowest', 'highest']
     name: 'Psalm'
     steps:
@@ -54,7 +54,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        php-version: ['8.1']
+        php-version: ['8.2']
     name: 'CS'
     steps:
       - name: Checkout
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9b26cfa..04c9a9a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,15 @@
 # Changelog
 
+## [Unreleased]
+
+### Changed
+
+- Requires `innmind/operating-system:~4.0`
+
+### Removed
+
+- Support for PHP `8.1`
+
 ## 6.1.0 - 2023-09-23
 
 ### Added
diff --git a/composer.json b/composer.json
index a719094..c235387 100644
--- a/composer.json
+++ b/composer.json
@@ -23,10 +23,10 @@
         }
     },
     "require": {
-        "php": "~8.1",
+        "php": "~8.2",
         "innmind/url": "~4.1",
         "innmind/immutable": "~4.13|~5.0",
-        "innmind/http-transport": "~6.5"
+        "innmind/http-transport": "~7.0"
     },
     "require-dev": {
         "phpunit/phpunit": "~9.0",
diff --git a/src/Directives.php b/src/Directives.php
index 3aa0141..4936d1a 100644
--- a/src/Directives.php
+++ b/src/Directives.php
@@ -152,7 +152,7 @@ public function asContent(): Content
                     ),
             );
 
-        return Content\Lines::of($lines);
+        return Content::ofLines($lines);
     }
 
     private function allows(string $url): bool
diff --git a/src/Parser.php b/src/Parser.php
index 21d4dab..5d269ae 100644
--- a/src/Parser.php
+++ b/src/Parser.php
@@ -7,8 +7,8 @@
 use Innmind\HttpTransport\Transport;
 use Innmind\Url\Url;
 use Innmind\Http\{
-    Message\Request\Request,
-    Message\Method,
+    Request,
+    Method,
     ProtocolVersion,
     Headers,
     Header,
@@ -37,7 +37,7 @@ private function __construct(
     public function __invoke(Url $url): Maybe
     {
         return ($this->fulfill)(
-            new Request(
+            Request::of(
                 $url,
                 Method::get,
                 ProtocolVersion::v20,
diff --git a/src/RobotsTxt.php b/src/RobotsTxt.php
index 0c9b320..7a0fdac 100644
--- a/src/RobotsTxt.php
+++ b/src/RobotsTxt.php
@@ -64,7 +64,7 @@ public function disallows(string $userAgent, Url $url): bool
 
     public function asContent(): Content
     {
-        return Content\Lines::of(
+        return Content::ofLines(
             $this
                 ->directives
                 ->map(static fn($directive) => $directive->asContent())
diff --git a/src/UserAgent.php b/src/UserAgent.php
index e4e3641..55b24d7 100644
--- a/src/UserAgent.php
+++ b/src/UserAgent.php
@@ -58,7 +58,7 @@ public function matches(string $userAgent): bool
 
     public function asContent(): Content
     {
-        return Content\Lines::of(
+        return Content::ofLines(
             $this
                 ->agents
                 ->map(static fn($agent) => $agent->prepend('User-agent: '))
diff --git a/tests/ParserTest.php b/tests/ParserTest.php
index ec60f78..8c6894e 100644
--- a/tests/ParserTest.php
+++ b/tests/ParserTest.php
@@ -15,10 +15,11 @@
 };
 use Innmind\Filesystem\File\Content;
 use Innmind\Url\Url;
-use Innmind\Http\Message\{
+use Innmind\Http\{
     Request,
-    StatusCode,
     Response,
+    Response\StatusCode,
+    ProtocolVersion,
 };
 use Innmind\Immutable\Either;
 use PHPUnit\Framework\TestCase;
@@ -32,31 +33,25 @@ public function testExecution()
             'InnmindCrawler',
         );
         $url = Url::of('http://example.com');
-        $response = $this->createMock(Response::class);
-        $response
-            ->expects($this->once())
-            ->method('statusCode')
-            ->willReturn(StatusCode::ok);
-        $response
-            ->expects($this->once())
-            ->method('body')
-            ->willReturn(
-                Content\Lines::ofContent(<<<TXT
-Sitemap : foo.xml
-Host : example.com
-Crawl-delay: 10
-User-agent : Foo
-User-agent : Bar
-Allow : /foo
-Disallow : /bar
+        $response = Response::of(
+            StatusCode::ok,
+            ProtocolVersion::v11,
+            null,
+            Content::ofString(<<<TXT
+            Sitemap : foo.xml
+            Host : example.com
+            Crawl-delay: 10
+            User-agent : Foo
+            User-agent : Bar
+            Allow : /foo
+            Disallow : /bar
 
-User-agent : *
-Disallow :
-Crawl-delay : 10
-Crawl-delay : 20
-TXT
-                ),
-            );
+            User-agent : *
+            Disallow :
+            Crawl-delay : 10
+            Crawl-delay : 20
+            TXT),
+        );
         $transport
             ->expects($this->once())
             ->method('__invoke')
@@ -71,8 +66,8 @@ public function testExecution()
                     ) &&
                     $request->body()->toString() === '';
             }))
-            ->willReturn(Either::right(new Success(
-                $this->createMock(Request::class),
+            ->willReturnCallback(static fn($request) => Either::right(new Success(
+                $request,
                 $response,
             )));
         $expected = 'User-agent: Foo'."\n";
@@ -101,19 +96,15 @@ public function testThrowWhenRequestNotFulfilled()
             'InnmindCrawler',
         );
         $url = Url::of('http://example.com');
-        $response = $this->createMock(Response::class);
-        $response
-            ->expects($this->once())
-            ->method('statusCode')
-            ->willReturn(StatusCode::notFound);
-        $response
-            ->expects($this->never())
-            ->method('body');
+        $response = Response::of(
+            StatusCode::notFound,
+            ProtocolVersion::v11,
+        );
         $transport
             ->expects($this->once())
             ->method('__invoke')
-            ->willReturn(Either::left(new ClientError(
-                $this->createMock(Request::class),
+            ->willReturnCallback(static fn($request) => Either::left(new ClientError(
+                $request,
                 $response,
             )));