diff --git a/composer.json b/composer.json
index d08208d..a9d7e07 100644
--- a/composer.json
+++ b/composer.json
@@ -18,15 +18,15 @@
         "psr/http-message": "^1.0.0",
         "psr/http-server-handler": "^1.0.0",
         "psr/http-server-middleware": "^1.0.0",
-        "snicco/psr7-error-handler": "^1.6",
-        "snicco/str-arr": "^1.6",
+        "snicco/psr7-error-handler": "^1.6.1",
+        "snicco/str-arr": "^1.6.1",
         "webimpress/safe-writer": "^2.2",
         "webmozart/assert": "^1.10"
     },
     "require-dev": {
         "phpunit/phpunit": "^9.5.13",
         "pimple/pimple": "^3.5",
-        "snicco/http-routing-testing": "^1.6"
+        "snicco/http-routing-testing": "^1.6.1"
     },
     "suggest": {
         "nyholm/psr7": "To use as a fast PSR7 implementation."
@@ -47,64 +47,64 @@
         "sort-packages": true
     },
     "conflict": {
-        "snicco/testable-clock": "<1.6.0",
-        "snicco/signed-url": "<1.6.0",
-        "snicco/templating": "<1.6.0",
+        "snicco/testable-clock": "<1.6.1",
+        "snicco/signed-url": "<1.6.1",
+        "snicco/templating": "<1.6.1",
         "snicco/psr7-error-handler": "<1.0.0",
-        "snicco/better-wpdb": "<1.6.0",
-        "snicco/better-wp-hooks": "<1.6.0",
-        "snicco/event-dispatcher": "<1.6.0",
-        "snicco/eloquent": "<1.6.0",
-        "snicco/better-wp-mail": "<1.6.0",
-        "snicco/better-wp-cache": "<1.6.0",
-        "snicco/session": "<1.6.0",
-        "snicco/better-wp-api": "<1.6.0",
-        "snicco/kernel": "<1.6.0",
-        "snicco/session-wp-bridge": "<1.6.0",
-        "snicco/session-psr16-bridge": "<1.6.0",
-        "snicco/blade-bridge": "<1.6.0",
-        "snicco/signed-url-psr16-bridge": "<1.6.0",
-        "snicco/illuminate-container-bridge": "<1.6.0",
-        "snicco/signed-url-psr15-bridge": "<1.6.0",
-        "snicco/pimple-bridge": "<1.6.0",
-        "snicco/no-robots-middleware": "<1.6.0",
-        "snicco/open-redirect-protection-middleware": "<1.6.0",
+        "snicco/better-wpdb": "<1.6.1",
+        "snicco/better-wp-hooks": "<1.6.1",
+        "snicco/event-dispatcher": "<1.6.1",
+        "snicco/eloquent": "<1.6.1",
+        "snicco/better-wp-mail": "<1.6.1",
+        "snicco/better-wp-cache": "<1.6.1",
+        "snicco/session": "<1.6.1",
+        "snicco/better-wp-api": "<1.6.1",
+        "snicco/kernel": "<1.6.1",
+        "snicco/session-wp-bridge": "<1.6.1",
+        "snicco/session-psr16-bridge": "<1.6.1",
+        "snicco/blade-bridge": "<1.6.1",
+        "snicco/signed-url-psr16-bridge": "<1.6.1",
+        "snicco/illuminate-container-bridge": "<1.6.1",
+        "snicco/signed-url-psr15-bridge": "<1.6.1",
+        "snicco/pimple-bridge": "<1.6.1",
+        "snicco/no-robots-middleware": "<1.6.1",
+        "snicco/open-redirect-protection-middleware": "<1.6.1",
         "snicco/wp-capapility-middleware": "<1.0.0",
-        "snicco/wp-nonce-middleware": "<1.6.0",
-        "snicco/payload-middleware": "<1.6.0",
-        "snicco/default-headers-middleware": "<1.6.0",
-        "snicco/wp-auth-only-middleware": "<1.6.0",
-        "snicco/content-negotiation-middleware": "<1.6.0",
-        "snicco/redirect-middleware": "<1.6.0",
-        "snicco/must-match-route-middleware": "<1.6.0",
-        "snicco/method-override-middleware": "<1.6.0",
-        "snicco/share-cookies-middleware": "<1.6.0",
-        "snicco/https-only-middleware": "<1.6.0",
+        "snicco/wp-nonce-middleware": "<1.6.1",
+        "snicco/payload-middleware": "<1.6.1",
+        "snicco/default-headers-middleware": "<1.6.1",
+        "snicco/wp-auth-only-middleware": "<1.6.1",
+        "snicco/content-negotiation-middleware": "<1.6.1",
+        "snicco/redirect-middleware": "<1.6.1",
+        "snicco/must-match-route-middleware": "<1.6.1",
+        "snicco/method-override-middleware": "<1.6.1",
+        "snicco/share-cookies-middleware": "<1.6.1",
+        "snicco/https-only-middleware": "<1.6.1",
         "snicco/guests-only-middleware": "<1.0.0",
-        "snicco/trailing-slash-middleware": "<1.6.0",
-        "snicco/testing-bundle": "<1.6.0",
-        "snicco/http-routing-bundle": "<1.6.0",
-        "snicco/debug-bundle": "<1.6.0",
-        "snicco/templating-bundle": "<1.6.0",
-        "snicco/better-wpdb-bundle": "<1.6.0",
-        "snicco/better-wp-hooks-bundle": "<1.6.0",
-        "snicco/blade-bundle": "<1.6.0",
-        "snicco/better-wp-mail-bundle": "<1.6.0",
-        "snicco/better-wp-cache-bundle": "<1.6.0",
-        "snicco/session-bundle": "<1.6.0",
-        "snicco/encryption-bundle": "<1.6.0",
-        "snicco/wp-guests-only-middleware": "<1.6.0",
-        "snicco/wp-capability-middleware": "<1.6.0",
-        "snicco/better-wp-mail-testing": "<1.6.0",
-        "snicco/session-testing": "<1.6.0",
-        "snicco/kernel-testing": "<1.6.0",
-        "snicco/signed-url-testing": "<1.6.0",
-        "snicco/http-routing-testing": "<1.6.0",
-        "snicco/event-dispatcher-testing": "<1.6.0",
-        "snicco/better-wp-cli": "<1.6.0",
-        "snicco/signed-url-wp-bridge": "<1.6.0",
-        "snicco/minimal-logger": "<1.6.0",
-        "snicco/better-wp-cli-testing": "<1.6.0"
+        "snicco/trailing-slash-middleware": "<1.6.1",
+        "snicco/testing-bundle": "<1.6.1",
+        "snicco/http-routing-bundle": "<1.6.1",
+        "snicco/debug-bundle": "<1.6.1",
+        "snicco/templating-bundle": "<1.6.1",
+        "snicco/better-wpdb-bundle": "<1.6.1",
+        "snicco/better-wp-hooks-bundle": "<1.6.1",
+        "snicco/blade-bundle": "<1.6.1",
+        "snicco/better-wp-mail-bundle": "<1.6.1",
+        "snicco/better-wp-cache-bundle": "<1.6.1",
+        "snicco/session-bundle": "<1.6.1",
+        "snicco/encryption-bundle": "<1.6.1",
+        "snicco/wp-guests-only-middleware": "<1.6.1",
+        "snicco/wp-capability-middleware": "<1.6.1",
+        "snicco/better-wp-mail-testing": "<1.6.1",
+        "snicco/session-testing": "<1.6.1",
+        "snicco/kernel-testing": "<1.6.1",
+        "snicco/signed-url-testing": "<1.6.1",
+        "snicco/http-routing-testing": "<1.6.1",
+        "snicco/event-dispatcher-testing": "<1.6.1",
+        "snicco/better-wp-cli": "<1.6.1",
+        "snicco/signed-url-wp-bridge": "<1.6.1",
+        "snicco/minimal-logger": "<1.6.1",
+        "snicco/better-wp-cli-testing": "<1.6.1"
     },
     "license": "LGPL-3.0-only",
     "minimum-stability": "dev",
diff --git a/tests/Middleware/MiddlewarePipelineTest.php b/tests/Middleware/MiddlewarePipelineTest.php
index 7af21f8..1683418 100644
--- a/tests/Middleware/MiddlewarePipelineTest.php
+++ b/tests/Middleware/MiddlewarePipelineTest.php
@@ -28,6 +28,8 @@
 use Snicco\Component\HttpRouting\Tests\helpers\CreateTestPsr17Factories;
 use Snicco\Component\Psr7ErrorHandler\HttpErrorHandler;
 
+use const SEEK_END;
+
 /**
  * @internal
  */
@@ -177,10 +179,11 @@ public function middleware_can_break_out_of_the_middleware_stack(): void
      */
     public function middleware_can_be_resolved_from_the_container(): void
     {
-        $this->pimple[MiddlewareWithDependencies::class] = fn (): MiddlewareWithDependencies => new MiddlewareWithDependencies(
-            new Foo('FOO'),
-            new Bar('BAR')
-        );
+        $this->pimple[MiddlewareWithDependencies::class] =
+            fn (): MiddlewareWithDependencies => new MiddlewareWithDependencies(
+                new Foo('FOO'),
+                new Bar('BAR')
+            );
 
         $response = $this->pipeline
             ->send($this->request)
@@ -348,8 +351,12 @@ public function __construct(string $value_to_add = 'foo')
     protected function handle(Request $request, NextMiddleware $next): ResponseInterface
     {
         $response = $next($request->withAttribute(self::ATTRIBUTE, $this->value_to_add));
-        $response->getBody()
-            ->write(':pm1');
+
+        $body = $response->getBody();
+
+        $body->seek(0, SEEK_END);
+
+        $body->write(':pm1');
 
         return $response;
     }
@@ -372,8 +379,12 @@ public function __construct(string $value_to_add = 'bar')
     protected function handle(Request $request, NextMiddleware $next): ResponseInterface
     {
         $response = $next->process($request->withAttribute(self::ATTRIBUTE, $this->value_to_add), $next);
-        $response->getBody()
-            ->write(':pm2');
+
+        $body = $response->getBody();
+
+        $body->seek(0, SEEK_END);
+
+        $body->write(':pm2');
 
         return $response;
     }
diff --git a/tests/Routing/UrlMatcher/RouteMiddlewareDependencyInjectionTest.php b/tests/Routing/UrlMatcher/RouteMiddlewareDependencyInjectionTest.php
index e906d3c..913a230 100644
--- a/tests/Routing/UrlMatcher/RouteMiddlewareDependencyInjectionTest.php
+++ b/tests/Routing/UrlMatcher/RouteMiddlewareDependencyInjectionTest.php
@@ -18,6 +18,8 @@
 use Snicco\Component\HttpRouting\Tests\fixtures\TestDependencies\Foo;
 use Snicco\Component\HttpRouting\Tests\HttpRunnerTestCase;
 
+use const SEEK_END;
+
 /**
  * @internal
  */
@@ -159,8 +161,11 @@ protected function handle(Request $request, NextMiddleware $next): ResponseInter
     {
         $response = $next($request);
 
-        $response->getBody()
-            ->write(':' . $this->foo->value . $this->bar->value . $this->baz . $this->biz);
+        $body = $response->getBody();
+
+        $body->seek(0, SEEK_END);
+
+        $body->write(':' . $this->foo->value . $this->bar->value . $this->baz . $this->biz);
 
         return $response;
     }
diff --git a/tests/fixtures/BarMiddleware.php b/tests/fixtures/BarMiddleware.php
index d34bf9a..b7580da 100644
--- a/tests/fixtures/BarMiddleware.php
+++ b/tests/fixtures/BarMiddleware.php
@@ -7,6 +7,7 @@
 use Psr\Http\Message\ResponseInterface;
 use Snicco\Component\HttpRouting\Http\Psr7\Request;
 use Snicco\Component\HttpRouting\Middleware\Middleware;
+use Snicco\Component\HttpRouting\Middleware\NextMiddleware;
 
 final class BarMiddleware extends Middleware
 {
@@ -17,12 +18,15 @@ public function __construct(string $bar = 'bar_middleware')
         $this->bar = $bar;
     }
 
-    protected function handle(Request $request, $next): ResponseInterface
+    protected function handle(Request $request, NextMiddleware $next): ResponseInterface
     {
         $response = $next($request);
 
-        $response->getBody()
-            ->write(':' . $this->bar);
+        $body = $response->getBody();
+
+        $body->seek(0, SEEK_END);
+
+        $body->write(':' . $this->bar);
 
         return $response;
     }
diff --git a/tests/fixtures/BazMiddleware.php b/tests/fixtures/BazMiddleware.php
index 8342bae..93a1f41 100644
--- a/tests/fixtures/BazMiddleware.php
+++ b/tests/fixtures/BazMiddleware.php
@@ -7,6 +7,7 @@
 use Psr\Http\Message\ResponseInterface;
 use Snicco\Component\HttpRouting\Http\Psr7\Request;
 use Snicco\Component\HttpRouting\Middleware\Middleware;
+use Snicco\Component\HttpRouting\Middleware\NextMiddleware;
 
 final class BazMiddleware extends Middleware
 {
@@ -17,12 +18,14 @@ public function __construct(string $baz = 'baz_middleware')
         $this->baz = $baz;
     }
 
-    protected function handle(Request $request, $next): ResponseInterface
+    protected function handle(Request $request, NextMiddleware $next): ResponseInterface
     {
         $response = $next($request);
 
-        $response->getBody()
-            ->write(':' . $this->baz);
+        $body = $response->getBody();
+        $body->seek(0, SEEK_END);
+
+        $body->write(':' . $this->baz);
 
         return $response;
     }
diff --git a/tests/fixtures/BooleanMiddleware.php b/tests/fixtures/BooleanMiddleware.php
index d0b6a85..8617a27 100644
--- a/tests/fixtures/BooleanMiddleware.php
+++ b/tests/fixtures/BooleanMiddleware.php
@@ -22,8 +22,10 @@ protected function handle(Request $request, NextMiddleware $next): ResponseInter
     {
         $response = $next($request);
 
-        $response->getBody()
-            ->write(':' . $this->val);
+        $body = $response->getBody();
+        $body->seek(0, SEEK_END);
+
+        $body->write(':' . $this->val);
 
         return $response;
     }
diff --git a/tests/fixtures/FooMiddleware.php b/tests/fixtures/FooMiddleware.php
index 7de580d..00f2ef9 100644
--- a/tests/fixtures/FooMiddleware.php
+++ b/tests/fixtures/FooMiddleware.php
@@ -8,6 +8,10 @@
 use Snicco\Component\HttpRouting\Http\Psr7\Request;
 use Snicco\Component\HttpRouting\Middleware\Middleware;
 
+use Snicco\Component\HttpRouting\Middleware\NextMiddleware;
+
+use const SEEK_END;
+
 final class FooMiddleware extends Middleware
 {
     public string $foo;
@@ -17,12 +21,15 @@ public function __construct(string $foo = 'foo_middleware')
         $this->foo = $foo;
     }
 
-    protected function handle(Request $request, $next): ResponseInterface
+    protected function handle(Request $request, NextMiddleware $next): ResponseInterface
     {
         $response = $next($request);
 
-        $response->getBody()
-            ->write(':' . $this->foo);
+        $body = $response->getBody();
+
+        $body->seek(0, SEEK_END);
+
+        $body->write(':' . $this->foo);
 
         return $response;
     }
diff --git a/tests/fixtures/FoobarMiddleware.php b/tests/fixtures/FoobarMiddleware.php
index a43681b..cfd57fe 100644
--- a/tests/fixtures/FoobarMiddleware.php
+++ b/tests/fixtures/FoobarMiddleware.php
@@ -8,6 +8,10 @@
 use Snicco\Component\HttpRouting\Http\Psr7\Request;
 use Snicco\Component\HttpRouting\Middleware\Middleware;
 
+use Snicco\Component\HttpRouting\Middleware\NextMiddleware;
+
+use const SEEK_END;
+
 final class FoobarMiddleware extends Middleware
 {
     private string $val;
@@ -21,12 +25,14 @@ public function __construct(string $foo = null, string $bar = null)
         }
     }
 
-    protected function handle(Request $request, $next): ResponseInterface
+    protected function handle(Request $request, NextMiddleware $next): ResponseInterface
     {
         $response = $next($request);
 
-        $response->getBody()
-            ->write(':' . $this->val);
+        $body = $response->getBody();
+        $body->seek(0, SEEK_END);
+
+        $body->write(':' . $this->val);
 
         return $response;
     }
diff --git a/tests/fixtures/IntegerMiddleware.php b/tests/fixtures/IntegerMiddleware.php
index 56bcb60..431db5c 100644
--- a/tests/fixtures/IntegerMiddleware.php
+++ b/tests/fixtures/IntegerMiddleware.php
@@ -22,8 +22,11 @@ protected function handle(Request $request, NextMiddleware $next): ResponseInter
     {
         $response = $next($request);
 
-        $response->getBody()
-            ->write(':' . $this->val);
+        $body = $response->getBody();
+
+        $body->seek(0, SEEK_END);
+
+        $body->write(':' . $this->val);
 
         return $response;
     }
diff --git a/tests/fixtures/MiddlewareWithDependencies.php b/tests/fixtures/MiddlewareWithDependencies.php
index a3c1903..539dc22 100644
--- a/tests/fixtures/MiddlewareWithDependencies.php
+++ b/tests/fixtures/MiddlewareWithDependencies.php
@@ -11,6 +11,8 @@
 use Snicco\Component\HttpRouting\Tests\fixtures\TestDependencies\Bar;
 use Snicco\Component\HttpRouting\Tests\fixtures\TestDependencies\Foo;
 
+use const SEEK_END;
+
 final class MiddlewareWithDependencies extends Middleware
 {
     public Foo $foo;
@@ -27,8 +29,9 @@ protected function handle(Request $request, NextMiddleware $next): ResponseInter
     {
         $response = $next($request);
 
-        $response->getBody()
-            ->write(':' . $this->foo->value . $this->bar->value);
+        $body = $response->getBody();
+        $body->seek(0, SEEK_END);
+        $body->write(':' . $this->foo->value . $this->bar->value);
 
         return $response;
     }