diff --git a/src/Actions/RecordUsage.php b/src/Actions/RecordUsage.php
index f5f4013..b26decb 100644
--- a/src/Actions/RecordUsage.php
+++ b/src/Actions/RecordUsage.php
@@ -2,7 +2,6 @@
 
 namespace SaeedVaziry\Monitoring\Actions;
 
-use Illuminate\Support\Str;
 use SaeedVaziry\Monitoring\Exceptions\OSIsNotSupported;
 use SaeedVaziry\Monitoring\Models\MonitoringRecord;
 
@@ -19,7 +18,7 @@ public function record(array $resources)
 
         $model = config('monitoring.models.monitoring_record');
         $record = new $model([
-            'instance_name' => Str::replace(' ', '', config('monitoring.instance_name')),
+            'instance_name' => str_replace(' ', '', config('monitoring.instance_name')),
             'cpu' => $resources['cpu'] ?? null,
             'memory' => $resources['memory'] ?? null,
             'disk' => $resources['disk'] ?? null,
diff --git a/src/System/CPU.php b/src/System/CPU.php
index e5d0702..9ef555e 100644
--- a/src/System/CPU.php
+++ b/src/System/CPU.php
@@ -2,8 +2,6 @@
 
 namespace SaeedVaziry\Monitoring\System;
 
-use Illuminate\Support\Str;
-
 class CPU implements SystemResource
 {
     /**
@@ -15,7 +13,7 @@ public function usage()
             return 50;
         }
 
-        $usage = Str::replace("\n", '', shell_exec(file_get_contents(__DIR__ . '/../../scripts/cpu.sh')));
+        $usage = str_replace("\n", '', shell_exec(file_get_contents(__DIR__ . '/../../scripts/cpu.sh')));
         if (is_numeric($usage)) {
             return $usage;
         }
diff --git a/src/System/Disk.php b/src/System/Disk.php
index 3dfc177..cfd5bc6 100644
--- a/src/System/Disk.php
+++ b/src/System/Disk.php
@@ -2,8 +2,6 @@
 
 namespace SaeedVaziry\Monitoring\System;
 
-use Illuminate\Support\Str;
-
 class Disk implements SystemResource
 {
     /**
@@ -15,7 +13,7 @@ public function usage()
             return 50;
         }
 
-        $usage = Str::replace("\n", '', shell_exec(file_get_contents(__DIR__ . '/../../scripts/disk.sh')));
+        $usage = str_replace("\n", '', shell_exec(file_get_contents(__DIR__ . '/../../scripts/disk.sh')));
         if (is_numeric($usage)) {
             return $usage;
         }
diff --git a/src/System/Memory.php b/src/System/Memory.php
index 9bad775..1de5f55 100644
--- a/src/System/Memory.php
+++ b/src/System/Memory.php
@@ -2,8 +2,6 @@
 
 namespace SaeedVaziry\Monitoring\System;
 
-use Illuminate\Support\Str;
-
 class Memory implements SystemResource
 {
     /**
@@ -15,7 +13,7 @@ public function usage()
             return 50;
         }
 
-        $usage = Str::replace("\n", '', shell_exec(file_get_contents(__DIR__ . '/../../scripts/memory.sh')));
+        $usage = str_replace("\n", '', shell_exec(file_get_contents(__DIR__ . '/../../scripts/memory.sh')));
         if (is_numeric($usage)) {
             return $usage;
         }