diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6078223..170cb85 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -21,6 +21,7 @@
 - `Innminf\Framework\Application::notFoundRequestHandler()` callable must now return an `Innmind\Immutable\Attempt<Response>`
 - `Innminf\Framework\Application::notFoundRequestHandler()` has been renamed `::routeNotFound()`
 - `Innmind\Framework\Application::mapCommand()` callable now longer has access to `OperatingSystem` and `Environment` (use services instead)
+- `Innmind\Framework\Application::run()` always return an `Innmind\Immutable\Attempt`
 
 ### Removed
 
diff --git a/src/Application.php b/src/Application.php
index 96a8be7..2e30aab 100644
--- a/src/Application.php
+++ b/src/Application.php
@@ -27,7 +27,7 @@
 
 /**
  * @template I of ServerRequest|CliEnv
- * @template O of Response|Attempt<CliEnv>
+ * @template O of Response|CliEnv
  */
 final class Application
 {
@@ -55,7 +55,7 @@ public static function http(OperatingSystem $os, Environment $env): self
     /**
      * @psalm-pure
      *
-     * @return self<CliEnv, Attempt<CliEnv>>
+     * @return self<CliEnv, CliEnv>
      */
     #[\NoDiscard]
     public static function cli(OperatingSystem $os, Environment $env): self
@@ -67,7 +67,7 @@ public static function cli(OperatingSystem $os, Environment $env): self
      * @psalm-pure
      * @experimental
      *
-     * @return self<CliEnv, Attempt<CliEnv>>
+     * @return self<CliEnv, CliEnv>
      */
     #[\NoDiscard]
     public static function asyncHttp(OperatingSystem $os): self
@@ -230,10 +230,10 @@ public function recoverRouteError(callable $recover): self
     /**
      * @param I $input
      *
-     * @return O
+     * @return Attempt<O>
      */
     #[\NoDiscard]
-    public function run(CliEnv|ServerRequest $input): Attempt|Response
+    public function run(CliEnv|ServerRequest $input): Attempt
     {
         return $this->app->run($input);
     }
diff --git a/src/Application/Async/Http.php b/src/Application/Async/Http.php
index 9114d0f..6e9075f 100644
--- a/src/Application/Async/Http.php
+++ b/src/Application/Async/Http.php
@@ -37,7 +37,7 @@
 /**
  * @experimental
  * @internal
- * @implements Implementation<CliEnv, Attempt<CliEnv>>
+ * @implements Implementation<CliEnv, CliEnv>
  */
 final class Http implements Implementation
 {
@@ -247,7 +247,7 @@ public function recoverRouteError(callable $recover): self
     }
 
     #[\Override]
-    public function run($input)
+    public function run($input): Attempt
     {
         $map = $this->map;
         $container = $this->container;
@@ -284,7 +284,7 @@ static function(ServerRequest $request, OperatingSystem $os) use (
                     static fn($request, $e) => $recover($request, $e, $container),
                 );
 
-                return $router($request);
+                return $router($request)->unwrap();
             },
         ));
 
diff --git a/src/Application/Cli.php b/src/Application/Cli.php
index 6dd050b..d5bd9b1 100644
--- a/src/Application/Cli.php
+++ b/src/Application/Cli.php
@@ -26,7 +26,7 @@
 
 /**
  * @internal
- * @implements Implementation<CliEnv, Attempt<CliEnv>>
+ * @implements Implementation<CliEnv, CliEnv>
  */
 final class Cli implements Implementation
 {
@@ -197,7 +197,7 @@ public function recoverRouteError(callable $recover): self
     }
 
     #[\Override]
-    public function run($input)
+    public function run($input): Attempt
     {
         $container = ($this->container)($this->os, $this->env)->build();
         $mapCommand = $this->mapCommand;
diff --git a/src/Application/Http.php b/src/Application/Http.php
index 1338c2f..120aeb0 100644
--- a/src/Application/Http.php
+++ b/src/Application/Http.php
@@ -227,7 +227,7 @@ public function recoverRouteError(callable $recover): self
     }
 
     #[\Override]
-    public function run($input)
+    public function run($input): Attempt
     {
         $container = ($this->container)($this->os, $this->env)->build();
         $mapRoute = $this->mapRoute;
diff --git a/src/Application/Implementation.php b/src/Application/Implementation.php
index 5b25031..9cccfd4 100644
--- a/src/Application/Implementation.php
+++ b/src/Application/Implementation.php
@@ -29,7 +29,7 @@
 /**
  * @internal
  * @template I of ServerRequest|CliEnv
- * @template O of Response|Attempt<CliEnv>
+ * @template O of Response|CliEnv
  */
 interface Implementation
 {
@@ -117,7 +117,7 @@ public function recoverRouteError(callable $recover): self;
     /**
      * @param I $input
      *
-     * @return O
+     * @return Attempt<O>
      */
-    public function run($input);
+    public function run($input): Attempt;
 }
diff --git a/src/Http/Router.php b/src/Http/Router.php
index d1c3ba9..6deed48 100644
--- a/src/Http/Router.php
+++ b/src/Http/Router.php
@@ -39,7 +39,10 @@ public function __construct(
     ) {
     }
 
-    public function __invoke(ServerRequest $request): Response
+    /**
+     * @return Attempt<Response>
+     */
+    public function __invoke(ServerRequest $request): Attempt
     {
         $recover = $this->recover;
 
@@ -63,6 +66,6 @@ public function __invoke(ServerRequest $request): Response
                 )),
         );
 
-        return $route($request)->unwrap();
+        return $route($request);
     }
 }
diff --git a/src/Main/Async/Http.php b/src/Main/Async/Http.php
index d55c40b..bab1619 100644
--- a/src/Main/Async/Http.php
+++ b/src/Main/Async/Http.php
@@ -19,17 +19,13 @@ abstract class Http extends Main
     #[\Override]
     protected function main(Environment $env, OperatingSystem $os): Attempt
     {
-        /**
-         * @psalm-suppress InvalidReturnStatement Let the app crash in case of a misuse
-         * @var Attempt<Environment>
-         */
         return static::configure(Application::asyncHttp($os))->run($env);
     }
 
     /**
-     * @param Application<Environment, Attempt<Environment>> $app
+     * @param Application<Environment, Environment> $app
      *
-     * @return Application<Environment, Attempt<Environment>>
+     * @return Application<Environment, Environment>
      */
     abstract protected function configure(Application $app): Application;
 }
diff --git a/src/Main/Cli.php b/src/Main/Cli.php
index f41e7cd..a8eba07 100644
--- a/src/Main/Cli.php
+++ b/src/Main/Cli.php
@@ -19,17 +19,13 @@ abstract class Cli extends Main
     #[\Override]
     protected function main(Environment $env, OperatingSystem $os): Attempt
     {
-        /**
-         * @psalm-suppress InvalidReturnStatement Let the app crash in case of a misuse
-         * @var Attempt<Environment>
-         */
         return static::configure(Application::cli($os, AppEnv::of($env->variables())))->run($env);
     }
 
     /**
-     * @param Application<Environment, Attempt<Environment>> $app
+     * @param Application<Environment, Environment> $app
      *
-     * @return Application<Environment, Attempt<Environment>>
+     * @return Application<Environment, Environment>
      */
     abstract protected function configure(Application $app): Application;
 }
diff --git a/src/Main/Http.php b/src/Main/Http.php
index c1c5e98..3dfa43d 100644
--- a/src/Main/Http.php
+++ b/src/Main/Http.php
@@ -17,6 +17,7 @@
 
 abstract class Http extends Main
 {
+    /** @var Application<ServerRequest, Response> */
     private Application $app;
 
     #[\Override]
@@ -28,11 +29,7 @@ protected function preload(OperatingSystem $os, Environment $env): void
     #[\Override]
     protected function main(ServerRequest $request): Response
     {
-        /**
-         * @psalm-suppress InvalidReturnStatement Let the app crash in case of a misuse
-         * @var Response
-         */
-        return $this->app->run($request);
+        return $this->app->run($request)->unwrap();
     }
 
     /**
diff --git a/src/Middleware.php b/src/Middleware.php
index de06db0..2098a51 100644
--- a/src/Middleware.php
+++ b/src/Middleware.php
@@ -8,13 +8,12 @@
     Response,
 };
 use Innmind\CLI\Environment as CliEnv;
-use Innmind\Immutable\Attempt;
 
 interface Middleware
 {
     /**
      * @template I of ServerRequest|CliEnv
-     * @template O of Response|Attempt<CliEnv>
+     * @template O of Response|CliEnv
      *
      * @param Application<I, O> $app
      *
diff --git a/tests/ApplicationTest.php b/tests/ApplicationTest.php
index b07c450..2ec7d4b 100644
--- a/tests/ApplicationTest.php
+++ b/tests/ApplicationTest.php
@@ -912,7 +912,7 @@ public function testHttpApplicationReturnsNotFoundByDefault(): BlackBox\Proof
                     $url,
                     $method,
                     $protocol,
-                ));
+                ))->unwrap();
 
                 $this->assertSame(StatusCode::notFound, $response->statusCode());
                 $this->assertSame($protocol, $response->protocolVersion());
@@ -962,7 +962,7 @@ public function testMatchRoutes(): BlackBox\Proof
                     Url::of('/foo'),
                     Method::get,
                     $protocol,
-                ));
+                ))->unwrap();
 
                 $this->assertSame($responseA, $response);
 
@@ -970,7 +970,7 @@ public function testMatchRoutes(): BlackBox\Proof
                     Url::of('/bar'),
                     Method::get,
                     $protocol,
-                ));
+                ))->unwrap();
 
                 $this->assertSame($responseB, $response);
             });
@@ -1019,7 +1019,7 @@ public function testRouteShortDeclaration(): BlackBox\Proof
                     Url::of('/foo'),
                     Method::get,
                     $protocol,
-                ));
+                ))->unwrap();
 
                 $this->assertSame($responseA, $response);
 
@@ -1027,7 +1027,7 @@ public function testRouteShortDeclaration(): BlackBox\Proof
                     Url::of('/bar'),
                     Method::post,
                     $protocol,
-                ));
+                ))->unwrap();
 
                 $this->assertSame($responseB, $response);
             });
@@ -1071,7 +1071,7 @@ public function __invoke()
                     Url::of('/foo'),
                     Method::get,
                     $protocol,
-                ));
+                ))->unwrap();
 
                 $this->assertSame($expected, $response);
             });
@@ -1114,7 +1114,7 @@ public function __invoke()
                     Url::of('/foo'),
                     $method,
                     $protocol,
-                ));
+                ))->unwrap();
 
                 $this->assertSame($expected, $response);
             });
@@ -1149,7 +1149,7 @@ public function testAllowToSpecifyHttpNotFoundRequestHandler(): BlackBox\Proof
                     $url,
                     $method,
                     $protocol,
-                ));
+                ))->unwrap();
 
                 $this->assertSame($expected, $response);
             });
@@ -1189,7 +1189,7 @@ public function testMatchMethodAllowed(): BlackBox\Proof
                     Url::of('/foo'),
                     Method::head,
                     $protocol,
-                ));
+                ))->unwrap();
 
                 $this->assertSame(405, $response->statusCode()->toInt());
                 $this->assertSame($protocol, $response->protocolVersion());
@@ -1240,7 +1240,7 @@ public function __invoke()
                     Url::of('/foo'),
                     Method::get,
                     $protocol,
-                ));
+                ))->unwrap();
 
                 $this->assertSame($expected, $response);
             });
@@ -1272,7 +1272,7 @@ public function testRoutesAsEnumCases(): BlackBox\Proof
                     Url::of('/foo'),
                     Method::get,
                     $protocol,
-                ));
+                ))->unwrap();
 
                 $this->assertSame($responseA, $response);
 
@@ -1280,7 +1280,7 @@ public function testRoutesAsEnumCases(): BlackBox\Proof
                     Url::of('/bar'),
                     Method::get,
                     $protocol,
-                ));
+                ))->unwrap();
 
                 $this->assertSame($responseB, $response);
             });
@@ -1311,7 +1311,7 @@ public function testRecoverRouteError(): BlackBox\Proof
                     Url::of('/foo'),
                     Method::get,
                     $protocol,
-                ));
+                ))->unwrap();
 
                 $this->assertSame($expected, $response);
             });