diff --git a/Process.php b/Process.php
index 3e8ae3ce..8f78fd57 100644
--- a/Process.php
+++ b/Process.php
@@ -776,7 +776,7 @@ public function setTimeout($timeout)
      */
     public function setTty($tty)
     {
-        $this->tty = (Boolean) $tty;
+        $this->tty = (bool) $tty;
 
         return $this;
     }
@@ -928,7 +928,7 @@ public function getEnhanceWindowsCompatibility()
      */
     public function setEnhanceWindowsCompatibility($enhance)
     {
-        $this->enhanceWindowsCompatibility = (Boolean) $enhance;
+        $this->enhanceWindowsCompatibility = (bool) $enhance;
 
         return $this;
     }
@@ -956,7 +956,7 @@ public function getEnhanceSigchildCompatibility()
      */
     public function setEnhanceSigchildCompatibility($enhance)
     {
-        $this->enhanceSigchildCompatibility = (Boolean) $enhance;
+        $this->enhanceSigchildCompatibility = (bool) $enhance;
 
         return $this;
     }
diff --git a/ProcessPipes.php b/ProcessPipes.php
index e6aabc5f..12cc47a8 100644
--- a/ProcessPipes.php
+++ b/ProcessPipes.php
@@ -35,8 +35,8 @@ class ProcessPipes
 
     public function __construct($useFiles, $ttyMode)
     {
-        $this->useFiles = (Boolean) $useFiles;
-        $this->ttyMode = (Boolean) $ttyMode;
+        $this->useFiles = (bool) $useFiles;
+        $this->ttyMode = (bool) $ttyMode;
 
         // Fix for PHP bug #51800: reading from STDOUT pipe hangs forever on Windows if the output is too big.
         // Workaround for this problem is to use temporary files instead of pipes on Windows platform.
@@ -180,10 +180,10 @@ public function readAndCloseHandles($blocking)
     public function hasOpenHandles()
     {
         if (!$this->useFiles) {
-            return (Boolean) $this->pipes;
+            return (bool) $this->pipes;
         }
 
-        return (Boolean) $this->pipes && (Boolean) $this->fileHandles;
+        return (bool) $this->pipes && (bool) $this->fileHandles;
     }
 
     /**