diff --git a/composer.json b/composer.json
index e1e7630..4f0c552 100644
--- a/composer.json
+++ b/composer.json
@@ -42,7 +42,7 @@
     "ext-dom": "*",
     "ext-simplexml": "*",
     "guzzlehttp/guzzle": "^6.0 || ^7.0",
-    "psr/log": "^1.0"
+    "psr/log": "^1.0 || ^2.0 || ^3.0"
   },
   "require-dev": {
     "phpunit/phpunit": "^9.5.4"
diff --git a/src/Request.php b/src/Request.php
index 0033a2b..aff9886 100644
--- a/src/Request.php
+++ b/src/Request.php
@@ -60,7 +60,7 @@ public function __construct(LoggerInterface $logger = null)
      *
      * @return null
      */
-    public function setLogger(LoggerInterface $logger)
+    public function setLogger(LoggerInterface $logger): void
     {
         $this->logger = $logger;
     }
diff --git a/src/SoapRequest.php b/src/SoapRequest.php
index dd565a9..3b996ae 100644
--- a/src/SoapRequest.php
+++ b/src/SoapRequest.php
@@ -52,7 +52,7 @@ public function __construct(LoggerInterface $logger = null)
      *
      * @return null
      */
-    public function setLogger(LoggerInterface $logger)
+    public function setLogger(LoggerInterface $logger): void
     {
         $this->logger = $logger;
     }
diff --git a/src/Ups.php b/src/Ups.php
index 52e04a8..be9eefc 100644
--- a/src/Ups.php
+++ b/src/Ups.php
@@ -94,7 +94,7 @@ public function setContext($context)
     /**
      * @param LoggerInterface $logger
      */
-    public function setLogger(LoggerInterface $logger)
+    public function setLogger(LoggerInterface $logger): void
     {
         $this->logger = $logger;
     }