diff --git a/src/Orchestration/Adapter.php b/src/Orchestration/Adapter.php
index 34326ec..81c957a 100644
--- a/src/Orchestration/Adapter.php
+++ b/src/Orchestration/Adapter.php
@@ -62,11 +62,10 @@ abstract public function listNetworks(): array;
     /**
      * Get usage stats of containers
      *
-     * @param  string  $container
      * @param  array<string, string>  $filters
      * @return array<\Utopia\Orchestration\Container\Stats>
      */
-    abstract public function getStats(string $container = null, array $filters = []): array;
+    abstract public function getStats(?string $container = null, array $filters = []): array;
 
     /**
      * Pull Image
diff --git a/src/Orchestration/Adapter/DockerAPI.php b/src/Orchestration/Adapter/DockerAPI.php
index 9680801..e12a063 100644
--- a/src/Orchestration/Adapter/DockerAPI.php
+++ b/src/Orchestration/Adapter/DockerAPI.php
@@ -15,12 +15,8 @@ class DockerAPI extends Adapter
 {
     /**
      * Constructor
-     *
-     * @param  string  $username
-     * @param  string  $password
-     * @param  string  $email
      */
-    public function __construct(string $username = null, string $password = null, string $email = null)
+    public function __construct(?string $username = null, ?string $password = null, ?string $email = null)
     {
         if ($username && $password && $email) {
             $this->registryAuth = base64_encode(json_encode([
@@ -188,9 +184,9 @@ public function createNetwork(string $name, bool $internal = false): bool
         ]);
 
         if ($result['code'] === 409) {
-            throw new Orchestration('Network with name "' . $name . '" already exists: ' . $result['response']);
+            throw new Orchestration('Network with name "'.$name.'" already exists: '.$result['response']);
         } elseif ($result['code'] !== 201) {
-            throw new Orchestration('Error creating network: ' . $result['response']);
+            throw new Orchestration('Error creating network: '.$result['response']);
         }
 
         return $result['response'];
@@ -256,11 +252,10 @@ public function networkDisconnect(string $container, string $network, bool $forc
     /**
      * Get usage stats of containers
      *
-     * @param  string  $container
      * @param  array<string, string>  $filters
      * @return array<Stats>
      */
-    public function getStats(string $container = null, array $filters = []): array
+    public function getStats(?string $container = null, array $filters = []): array
     {
         // List ahead of time, since API does not allow listing all usage stats
         $containerIds = [];
@@ -275,7 +270,7 @@ public function getStats(string $container = null, array $filters = []): array
         $list = [];
 
         foreach ($containerIds as $containerId) {
-            $result = $this->call('http://localhost/containers/' . $containerId . '/stats?stream=false', 'GET');
+            $result = $this->call('http://localhost/containers/'.$containerId.'/stats?stream=false', 'GET');
 
             if ($result['code'] !== 200) {
                 throw new Orchestration($result['response']);
diff --git a/src/Orchestration/Adapter/DockerCLI.php b/src/Orchestration/Adapter/DockerCLI.php
index a24fc73..cd57630 100644
--- a/src/Orchestration/Adapter/DockerCLI.php
+++ b/src/Orchestration/Adapter/DockerCLI.php
@@ -15,11 +15,9 @@ class DockerCLI extends Adapter
     /**
      * Constructor
      *
-     * @param  string  $username
-     * @param  string  $password
      * @return void
      */
-    public function __construct(string $username = null, string $password = null)
+    public function __construct(?string $username = null, ?string $password = null)
     {
         if ($username && $password) {
             $output = '';
@@ -81,11 +79,10 @@ public function networkDisconnect(string $container, string $network, bool $forc
     /**
      * Get usage stats of containers
      *
-     * @param  string  $container
      * @param  array<string, string>  $filters
      * @return array<Stats>
      */
-    public function getStats(string $container = null, array $filters = []): array
+    public function getStats(?string $container = null, array $filters = []): array
     {
         // List ahead of time, since docker stats does not allow filtering
         $containerIds = [];
@@ -163,7 +160,7 @@ private function parseIOStats(string $stats)
             'TiB' => 1000000000000,
         ];
 
-        [ $inStr, $outStr ] = \explode(' / ', $stats);
+        [$inStr, $outStr] = \explode(' / ', $stats);
 
         $inUnit = null;
         $outUnit = null;
diff --git a/src/Orchestration/Orchestration.php b/src/Orchestration/Orchestration.php
index f12acf2..c6dcd4c 100644
--- a/src/Orchestration/Orchestration.php
+++ b/src/Orchestration/Orchestration.php
@@ -110,11 +110,10 @@ public function networkConnect(string $container, string $network): bool
     /**
      * Get usage stats of containers
      *
-     * @param  string  $container
      * @param  array<string, string>  $filters
      * @return array<\Utopia\Orchestration\Container\Stats>
      */
-    public function getStats(string $container = null, array $filters = []): array
+    public function getStats(?string $container = null, array $filters = []): array
     {
         return $this->adapter->getStats($container, $filters);
     }