diff --git a/src/Checks/ComposerWithDevDependenciesIsUpToDate.php b/src/Checks/ComposerWithDevDependenciesIsUpToDate.php
index e7f9871..8adf408 100644
--- a/src/Checks/ComposerWithDevDependenciesIsUpToDate.php
+++ b/src/Checks/ComposerWithDevDependenciesIsUpToDate.php
@@ -4,6 +4,7 @@
 
 use BeyondCode\SelfDiagnosis\Composer;
 use Illuminate\Support\Arr;
+use Illuminate\Support\Str;
 
 class ComposerWithDevDependenciesIsUpToDate implements Check
 {
@@ -42,7 +43,7 @@ public function check(array $config): bool
 
         $this->output = $this->composer->installDryRun($additionalOptions);
 
-        return str_contains($this->output, 'Nothing to install or update');
+        return Str::contains($this->output, 'Nothing to install or update');
     }
 
     /**
diff --git a/src/Checks/ComposerWithoutDevDependenciesIsUpToDate.php b/src/Checks/ComposerWithoutDevDependenciesIsUpToDate.php
index 141c108..855bebf 100644
--- a/src/Checks/ComposerWithoutDevDependenciesIsUpToDate.php
+++ b/src/Checks/ComposerWithoutDevDependenciesIsUpToDate.php
@@ -4,6 +4,7 @@
 
 use BeyondCode\SelfDiagnosis\Composer;
 use Illuminate\Support\Arr;
+use Illuminate\Support\Str;
 
 class ComposerWithoutDevDependenciesIsUpToDate implements Check
 {
@@ -42,7 +43,7 @@ public function check(array $config): bool
 
         $this->output = $this->composer->installDryRun('--no-dev ' . $additionalOptions);
 
-        return str_contains($this->output, 'Nothing to install or update');
+        return Str::contains($this->output, 'Nothing to install or update');
     }
 
     /**
diff --git a/src/Checks/PhpExtensionsAreInstalled.php b/src/Checks/PhpExtensionsAreInstalled.php
index 6f37bf7..d0f1617 100644
--- a/src/Checks/PhpExtensionsAreInstalled.php
+++ b/src/Checks/PhpExtensionsAreInstalled.php
@@ -5,6 +5,7 @@
 use Illuminate\Filesystem\Filesystem;
 use Illuminate\Support\Arr;
 use Illuminate\Support\Collection;
+use Illuminate\Support\Str;
 
 class PhpExtensionsAreInstalled implements Check
 {
@@ -77,10 +78,10 @@ public function getExtensionsRequiredInComposerFile()
         $extensions = [];
         foreach ($installedPackages as $installedPackage) {
             $filtered = Arr::where(array_keys(Arr::get($installedPackage, 'require', [])), function ($value, $key) {
-                return starts_with($value, self::EXT);
+                return Str::startsWith($value, self::EXT);
             });
             foreach ($filtered as $extension) {
-                $extensions[] = str_replace_first(self::EXT, '', $extension);
+                $extensions[] = Str::replaceFirst(self::EXT, '', $extension);
             }
         }
         return array_unique($extensions);
diff --git a/src/Checks/ServersArePingable.php b/src/Checks/ServersArePingable.php
index 011f788..5338111 100644
--- a/src/Checks/ServersArePingable.php
+++ b/src/Checks/ServersArePingable.php
@@ -88,10 +88,10 @@ private function parseConfiguredServers(array $servers): Collection
 
         foreach ($servers as $server) {
             if (is_array($server)) {
-                if (!empty(array_except($server, ['host', 'port', 'timeout']))) {
+                if (!empty(Arr::except($server, ['host', 'port', 'timeout']))) {
                     throw new InvalidConfigurationException('Servers in array notation may only contain a host, port and timeout parameter.');
                 }
-                if (!array_has($server, 'host')) {
+                if (!Arr::has($server, 'host')) {
                     throw new InvalidConfigurationException('For servers in array notation, the host parameter is required.');
                 }