diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8c94bae..09dcf01 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,8 @@
 ### Changed
 
 - Requires `innmind/immutable:~5.14`
+- `Innmind\Server\Status\Server::cpu()` now returns `Innmind\Immutable\Attempt<Innmind\Server\Status\Server\Cpu>`
+- `Innmind\Server\Status\Server::memory()` now returns `Innmind\Immutable\Attempt<Innmind\Server\Status\Server\Memory>`
 
 ## 4.1.1 - 2024-09-30
 
diff --git a/src/Facade/Cpu/LinuxFacade.php b/src/Facade/Cpu/LinuxFacade.php
index f376f46..c345bbf 100644
--- a/src/Facade/Cpu/LinuxFacade.php
+++ b/src/Facade/Cpu/LinuxFacade.php
@@ -14,6 +14,7 @@
 };
 use Innmind\Immutable\{
     Str,
+    Attempt,
     Maybe,
     Monoid\Concat,
 };
@@ -31,9 +32,9 @@ public function __construct(Processes $processes)
     }
 
     /**
-     * @return Maybe<Cpu>
+     * @return Attempt<Cpu>
      */
-    public function __invoke(): Maybe
+    public function __invoke(): Attempt
     {
         return $this
             ->processes
@@ -45,8 +46,10 @@ public function __invoke(): Maybe
                             ->withArgument('%Cpu'),
                     ),
             )
-            ->maybe()
-            ->flatMap(static fn($process) => $process->wait()->maybe())
+            ->flatMap(static fn($process) => $process->wait()->match(
+                Attempt::result(...),
+                static fn() => Attempt::error(new \RuntimeException('Failed to retrieve CPU usage')),
+            ))
             ->map(
                 static fn($success) => $success
                     ->output()
@@ -57,9 +60,9 @@ public function __invoke(): Maybe
     }
 
     /**
-     * @return Maybe<Cpu>
+     * @return Attempt<Cpu>
      */
-    private function parse(Str $output): Maybe
+    private function parse(Str $output): Attempt
     {
         $percentages = $output
             ->trim()
@@ -97,6 +100,10 @@ private function parse(Str $output): Maybe
                 new Percentage($sys),
                 new Percentage($idle),
                 new Cores($cores),
-            ));
+            ))
+            ->match(
+                Attempt::result(...),
+                static fn() => Attempt::error(new \RuntimeException('Failed to parse CPU usage')),
+            );
     }
 }
diff --git a/src/Facade/Cpu/OSXFacade.php b/src/Facade/Cpu/OSXFacade.php
index 6f5c440..a8706d8 100644
--- a/src/Facade/Cpu/OSXFacade.php
+++ b/src/Facade/Cpu/OSXFacade.php
@@ -14,6 +14,7 @@
 };
 use Innmind\Immutable\{
     Str,
+    Attempt,
     Maybe,
     Monoid\Concat,
 };
@@ -31,9 +32,9 @@ public function __construct(Processes $processes)
     }
 
     /**
-     * @return Maybe<Cpu>
+     * @return Attempt<Cpu>
      */
-    public function __invoke(): Maybe
+    public function __invoke(): Attempt
     {
         return $this
             ->processes
@@ -46,8 +47,10 @@ public function __invoke(): Maybe
                             ->withArgument('CPU usage'),
                     ),
             )
-            ->maybe()
-            ->flatMap(static fn($process) => $process->wait()->maybe())
+            ->flatMap(static fn($process) => $process->wait()->match(
+                Attempt::result(...),
+                static fn() => Attempt::error(new \RuntimeException('Failed to retrieve CPU usage')),
+            ))
             ->map(
                 static fn($success) => $success
                     ->output()
@@ -58,9 +61,9 @@ public function __invoke(): Maybe
     }
 
     /**
-     * @return Maybe<Cpu>
+     * @return Attempt<Cpu>
      */
-    private function parse(Str $output): Maybe
+    private function parse(Str $output): Attempt
     {
         $percentages = $output
             ->trim()
@@ -104,6 +107,10 @@ private function parse(Str $output): Maybe
                 new Percentage($sys),
                 new Percentage($idle),
                 new Cores($cores),
-            ));
+            ))
+            ->match(
+                Attempt::result(...),
+                static fn() => Attempt::error(new \RuntimeException('Failed to parse CPU usage')),
+            );
     }
 }
diff --git a/src/Facade/Memory/LinuxFacade.php b/src/Facade/Memory/LinuxFacade.php
index e1d03fb..e0ee702 100644
--- a/src/Facade/Memory/LinuxFacade.php
+++ b/src/Facade/Memory/LinuxFacade.php
@@ -14,6 +14,7 @@
 use Innmind\Immutable\{
     Str,
     Map,
+    Attempt,
     Maybe,
     Monoid\Concat,
 };
@@ -38,9 +39,9 @@ public function __construct(Processes $processes)
     }
 
     /**
-     * @return Maybe<Memory>
+     * @return Attempt<Memory>
      */
-    public function __invoke(): Maybe
+    public function __invoke(): Attempt
     {
         return $this
             ->processes
@@ -48,8 +49,10 @@ public function __invoke(): Maybe
                 Command::foreground('cat')
                     ->withArgument('/proc/meminfo'),
             )
-            ->maybe()
-            ->flatMap(static fn($process) => $process->wait()->maybe())
+            ->flatMap(static fn($process) => $process->wait()->match(
+                Attempt::result(...),
+                static fn() => Attempt::error(new \RuntimeException('Failed to retrieve memory usage')),
+            ))
             ->map(
                 static fn($success) => $success
                     ->output()
@@ -60,9 +63,9 @@ public function __invoke(): Maybe
     }
 
     /**
-     * @return Maybe<Memory>
+     * @return Attempt<Memory>
      */
-    private function parse(Str $output): Maybe
+    private function parse(Str $output): Attempt
     {
         /** @var Map<string, int> */
         $amounts = $output
@@ -102,6 +105,10 @@ static function(Map $map, Str $line): Map {
                 new Bytes($free),
                 new Bytes($swap),
                 new Bytes($used),
-            ));
+            ))
+            ->match(
+                Attempt::result(...),
+                static fn() => Attempt::error(new \RuntimeException('Failed to parse memory usage')),
+            );
     }
 }
diff --git a/src/Facade/Memory/OSXFacade.php b/src/Facade/Memory/OSXFacade.php
index 5a8e49c..4eb3b9c 100644
--- a/src/Facade/Memory/OSXFacade.php
+++ b/src/Facade/Memory/OSXFacade.php
@@ -14,6 +14,7 @@
 };
 use Innmind\Immutable\{
     Str,
+    Attempt,
     Maybe,
     Monoid\Concat,
 };
@@ -33,9 +34,9 @@ public function __construct(Processes $processes, EnvironmentPath $path)
     }
 
     /**
-     * @return Maybe<Memory>
+     * @return Attempt<Memory>
      */
-    public function __invoke(): Maybe
+    public function __invoke(): Attempt
     {
         $total = $this
             ->run(
@@ -96,7 +97,11 @@ public function __invoke(): Maybe
                 $unused,
                 $swap,
                 $used,
-            ));
+            ))
+            ->match(
+                Attempt::result(...),
+                static fn() => Attempt::error(new \RuntimeException('Failed to parse memory usage')),
+            );
     }
 
     private function run(Command $command): Str
diff --git a/src/Server.php b/src/Server.php
index acbc85d..4be95f3 100644
--- a/src/Server.php
+++ b/src/Server.php
@@ -11,19 +11,19 @@
     Disk,
 };
 use Innmind\Url\Path;
-use Innmind\Immutable\Maybe;
+use Innmind\Immutable\Attempt;
 
 interface Server
 {
     /**
-     * @return Maybe<Cpu>
+     * @return Attempt<Cpu>
      */
-    public function cpu(): Maybe;
+    public function cpu(): Attempt;
 
     /**
-     * @return Maybe<Memory>
+     * @return Attempt<Memory>
      */
-    public function memory(): Maybe;
+    public function memory(): Attempt;
     public function processes(): Processes;
     public function loadAverage(): LoadAverage;
     public function disk(): Disk;
diff --git a/src/Servers/Linux.php b/src/Servers/Linux.php
index f8cda82..a39a0e4 100644
--- a/src/Servers/Linux.php
+++ b/src/Servers/Linux.php
@@ -17,7 +17,7 @@
 use Innmind\Server\Control\Server as Control;
 use Innmind\TimeContinuum\Clock;
 use Innmind\Url\Path;
-use Innmind\Immutable\Maybe;
+use Innmind\Immutable\Attempt;
 
 final class Linux implements Server
 {
@@ -37,13 +37,13 @@ public function __construct(Clock $clock, Control $control)
     }
 
     #[\Override]
-    public function cpu(): Maybe
+    public function cpu(): Attempt
     {
         return ($this->cpu)();
     }
 
     #[\Override]
-    public function memory(): Maybe
+    public function memory(): Attempt
     {
         return ($this->memory)();
     }
diff --git a/src/Servers/Logger.php b/src/Servers/Logger.php
index 46c6d40..14ea4ed 100644
--- a/src/Servers/Logger.php
+++ b/src/Servers/Logger.php
@@ -10,7 +10,7 @@
     Server\Disk,
 };
 use Innmind\Url\Path;
-use Innmind\Immutable\Maybe;
+use Innmind\Immutable\Attempt;
 use Psr\Log\LoggerInterface;
 
 final class Logger implements Server
@@ -25,7 +25,7 @@ public function __construct(Server $server, LoggerInterface $logger)
     }
 
     #[\Override]
-    public function cpu(): Maybe
+    public function cpu(): Attempt
     {
         return $this
             ->server
@@ -38,7 +38,7 @@ public function cpu(): Maybe
     }
 
     #[\Override]
-    public function memory(): Maybe
+    public function memory(): Attempt
     {
         return $this
             ->server
diff --git a/src/Servers/OSX.php b/src/Servers/OSX.php
index 4956b09..edf3901 100644
--- a/src/Servers/OSX.php
+++ b/src/Servers/OSX.php
@@ -18,7 +18,7 @@
 use Innmind\Server\Control\Server as Control;
 use Innmind\TimeContinuum\Clock;
 use Innmind\Url\Path;
-use Innmind\Immutable\Maybe;
+use Innmind\Immutable\Attempt;
 
 final class OSX implements Server
 {
@@ -38,13 +38,13 @@ public function __construct(Clock $clock, Control $control, EnvironmentPath $pat
     }
 
     #[\Override]
-    public function cpu(): Maybe
+    public function cpu(): Attempt
     {
         return ($this->cpu)();
     }
 
     #[\Override]
-    public function memory(): Maybe
+    public function memory(): Attempt
     {
         return ($this->memory)();
     }