diff --git a/src/Exception/ActiveContainerNotFoundException.php b/src/Exception/ActiveContainerNotFoundException.php
index 93f9a59..ee6d01d 100644
--- a/src/Exception/ActiveContainerNotFoundException.php
+++ b/src/Exception/ActiveContainerNotFoundException.php
@@ -9,7 +9,7 @@
 
 final class ActiveContainerNotFoundException extends LogicException
 {
-    public function __construct(Throwable $previous = null)
+    public function __construct(?Throwable $previous = null)
     {
         parent::__construct("Active container not found", 0, $previous);
     }
diff --git a/src/Exception/ActiveExecutionContextNotFoundException.php b/src/Exception/ActiveExecutionContextNotFoundException.php
index 89ba067..fe37800 100644
--- a/src/Exception/ActiveExecutionContextNotFoundException.php
+++ b/src/Exception/ActiveExecutionContextNotFoundException.php
@@ -9,7 +9,7 @@
 
 final class ActiveExecutionContextNotFoundException extends LogicException
 {
-    public function __construct(Throwable $previous = null)
+    public function __construct(?Throwable $previous = null)
     {
         parent::__construct("Active test, fixture or step not found", 0, $previous);
     }
diff --git a/src/Exception/ActiveStepNotFoundException.php b/src/Exception/ActiveStepNotFoundException.php
index d2a9c22..05c1f82 100644
--- a/src/Exception/ActiveStepNotFoundException.php
+++ b/src/Exception/ActiveStepNotFoundException.php
@@ -9,7 +9,7 @@
 
 final class ActiveStepNotFoundException extends LogicException
 {
-    public function __construct(Throwable $previous = null)
+    public function __construct(?Throwable $previous = null)
     {
         parent::__construct("Active step not found", 0, $previous);
     }
diff --git a/src/Exception/ActiveTestNotFoundException.php b/src/Exception/ActiveTestNotFoundException.php
index 7e3cd6e..fe3af20 100644
--- a/src/Exception/ActiveTestNotFoundException.php
+++ b/src/Exception/ActiveTestNotFoundException.php
@@ -9,7 +9,7 @@
 
 final class ActiveTestNotFoundException extends LogicException
 {
-    public function __construct(Throwable $previous = null)
+    public function __construct(?Throwable $previous = null)
     {
         parent::__construct("Active test or fixture not found", 0, $previous);
     }
diff --git a/src/Exception/InvalidMethodNameException.php b/src/Exception/InvalidMethodNameException.php
index ddf6682..c55e174 100644
--- a/src/Exception/InvalidMethodNameException.php
+++ b/src/Exception/InvalidMethodNameException.php
@@ -13,7 +13,7 @@ final class InvalidMethodNameException extends \DomainException
 {
     public function __construct(
         private mixed $methodName,
-        Throwable $previous = null,
+        ?Throwable $previous = null,
     ) {
         $methodDescription = gettype($this->methodName);
         if (is_object($this->methodName)) {
diff --git a/src/Io/Exception/DirectoryNotCreatedException.php b/src/Io/Exception/DirectoryNotCreatedException.php
index e2d7830..f014277 100644
--- a/src/Io/Exception/DirectoryNotCreatedException.php
+++ b/src/Io/Exception/DirectoryNotCreatedException.php
@@ -12,7 +12,7 @@ final class DirectoryNotCreatedException extends RuntimeException
     public function __construct(
         private string $directory,
         ?string $message = null,
-        Throwable $previous = null,
+        ?Throwable $previous = null,
     ) {
         parent::__construct($this->buildMessage($message), 0, $previous);
     }
diff --git a/src/Io/Exception/DirectoryNotResolvedException.php b/src/Io/Exception/DirectoryNotResolvedException.php
index f347fb7..b0acf52 100644
--- a/src/Io/Exception/DirectoryNotResolvedException.php
+++ b/src/Io/Exception/DirectoryNotResolvedException.php
@@ -12,7 +12,7 @@ final class DirectoryNotResolvedException extends RuntimeException
     public function __construct(
         private string $directory,
         ?string $message = null,
-        Throwable $previous = null,
+        ?Throwable $previous = null,
     ) {
         parent::__construct($this->buildMessage($message), 0, $previous);
     }
diff --git a/src/Io/Exception/InvalidDirectoryException.php b/src/Io/Exception/InvalidDirectoryException.php
index 36841e1..144e383 100644
--- a/src/Io/Exception/InvalidDirectoryException.php
+++ b/src/Io/Exception/InvalidDirectoryException.php
@@ -11,7 +11,7 @@ final class InvalidDirectoryException extends RuntimeException
 {
     public function __construct(
         private string $directory,
-        Throwable $previous = null,
+        ?Throwable $previous = null,
     ) {
         parent::__construct("Not a directory: {$this->directory}", 0, $previous);
     }
diff --git a/src/Io/Exception/IoFailedException.php b/src/Io/Exception/IoFailedException.php
index 75f32db..21287d6 100644
--- a/src/Io/Exception/IoFailedException.php
+++ b/src/Io/Exception/IoFailedException.php
@@ -9,7 +9,7 @@
 
 final class IoFailedException extends RuntimeException
 {
-    public function __construct(?string $message = null, Throwable $previous = null)
+    public function __construct(?string $message = null, ?Throwable $previous = null)
     {
         parent::__construct($this->buildMessage($message), 0, $previous);
     }
diff --git a/src/Io/Exception/StreamCopyFailedException.php b/src/Io/Exception/StreamCopyFailedException.php
index a165b99..c0dbcc1 100644
--- a/src/Io/Exception/StreamCopyFailedException.php
+++ b/src/Io/Exception/StreamCopyFailedException.php
@@ -9,7 +9,7 @@
 
 final class StreamCopyFailedException extends RuntimeException
 {
-    public function __construct(?string $message = null, Throwable $previous = null)
+    public function __construct(?string $message = null, ?Throwable $previous = null)
     {
         parent::__construct($this->buildMessage($message), 0, $previous);
     }
diff --git a/src/Io/Exception/StreamOpenFailedException.php b/src/Io/Exception/StreamOpenFailedException.php
index 6defa40..48e0983 100644
--- a/src/Io/Exception/StreamOpenFailedException.php
+++ b/src/Io/Exception/StreamOpenFailedException.php
@@ -12,7 +12,7 @@ final class StreamOpenFailedException extends RuntimeException
     public function __construct(
         private string $link,
         ?string $message = null,
-        Throwable $previous = null,
+        ?Throwable $previous = null,
     ) {
         parent::__construct(
             $this->buildMessage($message),
diff --git a/src/Io/Exception/StreamWriteFailedException.php b/src/Io/Exception/StreamWriteFailedException.php
index fd57833..c45abb1 100644
--- a/src/Io/Exception/StreamWriteFailedException.php
+++ b/src/Io/Exception/StreamWriteFailedException.php
@@ -9,7 +9,7 @@
 
 final class StreamWriteFailedException extends RuntimeException
 {
-    public function __construct(?string $message = null, Throwable $previous = null)
+    public function __construct(?string $message = null, ?Throwable $previous = null)
     {
         parent::__construct($this->buildMessage($message), 0, $previous);
     }
diff --git a/src/Model/Exception/InvalidSeverityException.php b/src/Model/Exception/InvalidSeverityException.php
index 69badb8..ba73ab2 100644
--- a/src/Model/Exception/InvalidSeverityException.php
+++ b/src/Model/Exception/InvalidSeverityException.php
@@ -9,7 +9,7 @@
 
 final class InvalidSeverityException extends DomainException
 {
-    public function __construct(private string $severity, Throwable $previous = null)
+    public function __construct(private string $severity, ?Throwable $previous = null)
     {
         parent::__construct("Invalid severity: $this->severity", 0, $previous);
     }