diff --git a/composer.json b/composer.json
index 9b7d46596..b1115fb2f 100644
--- a/composer.json
+++ b/composer.json
@@ -39,7 +39,7 @@
     "php": ">=7.2",
     "ext-json": "*",
     "doctrine/annotations": "^1.7",
-    "psr/log": "^1.1",
+    "psr/log": "^1.1 || ^2.0 || ^3.0",
     "symfony/finder": ">=2.2",
     "symfony/yaml": ">=3.3"
   },
diff --git a/src/Logger/ConsoleLogger.php b/src/Logger/ConsoleLogger.php
index cc43929b4..aa3a5f7d6 100644
--- a/src/Logger/ConsoleLogger.php
+++ b/src/Logger/ConsoleLogger.php
@@ -31,7 +31,7 @@ public function called()
     /**
      * @param array $context additional details; supports custom `prefix` and `exception`
      */
-    public function log($level, $message, array $context = [])
+    public function log($level, $message, array $context = []): void
     {
         $this->called = true;
 
diff --git a/src/Logger/DefaultLogger.php b/src/Logger/DefaultLogger.php
index 9700d9267..cb2195af4 100644
--- a/src/Logger/DefaultLogger.php
+++ b/src/Logger/DefaultLogger.php
@@ -13,7 +13,7 @@
 
 class DefaultLogger extends AbstractLogger implements LoggerInterface
 {
-    public function log($level, $message, array $context = [])
+    public function log($level, $message, array $context = []): void
     {
         // BC: delegate to the static instance
         if (in_array($level, [LogLevel::NOTICE, LogLevel::INFO, LogLevel::DEBUG])) {
diff --git a/tests/OpenApiTestCase.php b/tests/OpenApiTestCase.php
index d7bc316ab..e1cbed472 100644
--- a/tests/OpenApiTestCase.php
+++ b/tests/OpenApiTestCase.php
@@ -60,7 +60,7 @@ public function __construct($testCase)
                 $this->testCase = $testCase;
             }
 
-            public function log($level, $message, array $context = [])
+            public function log($level, $message, array $context = []): void
             {
                 if (count($this->testCase->expectedLogMessages)) {
                     list($assertion, $needle) = array_shift($this->testCase->expectedLogMessages);