diff --git a/src/JsonRPC/Request/RequestParser.php b/src/JsonRPC/Request/RequestParser.php
index 48d94e0..b468a0d 100644
--- a/src/JsonRPC/Request/RequestParser.php
+++ b/src/JsonRPC/Request/RequestParser.php
@@ -65,7 +65,7 @@ class RequestParser
      */
     protected $requestLogger;
 
-    protected ?LoggerInterface $psr3Logger = null;
+    protected ?LoggerInterface $psr3Logger;
 
     /**
      * Get new object instance
diff --git a/src/JsonRPC/Response/ResponseBuilder.php b/src/JsonRPC/Response/ResponseBuilder.php
index fb7a21e..be960bf 100644
--- a/src/JsonRPC/Response/ResponseBuilder.php
+++ b/src/JsonRPC/Response/ResponseBuilder.php
@@ -88,7 +88,7 @@ class ResponseBuilder
      */
     protected $exception;
 
-    protected ?LoggerInterface $psr3Logger = null;
+    protected ?LoggerInterface $psr3Logger;
 
     /**
      * Get new object instance
diff --git a/src/JsonRPC/Server.php b/src/JsonRPC/Server.php
index 2b98e89..289ef5b 100644
--- a/src/JsonRPC/Server.php
+++ b/src/JsonRPC/Server.php
@@ -126,7 +126,7 @@ class Server
      */
     protected $requestLogger;
 
-    protected ?LoggerInterface $psr3Logger = null;
+    protected ?LoggerInterface $psr3Logger;
 
     /**
      * Constructor