diff --git a/composer.json b/composer.json
index 9ec70a4..d90936e 100644
--- a/composer.json
+++ b/composer.json
@@ -7,7 +7,7 @@
         "ext-pdo": "*",
         "dragonmantank/cron-expression": "^3.3.2",
         "ingenerator/php-utils": "^2.0",
-        "psr/log": "^1.0 || ^2.0",
+        "psr/log": "^1.0 || ^2.0 || ^3.0",
         "symfony/lock": "^5.4 || ^6.0 || ^7.0",
         "symfony/process": "^5.4 || ^6.0 || ^7.0"
     },
diff --git a/test/integration/CronExecutionIntegrationTest.php b/test/integration/CronExecutionIntegrationTest.php
index 0320ddc..755a524 100644
--- a/test/integration/CronExecutionIntegrationTest.php
+++ b/test/integration/CronExecutionIntegrationTest.php
@@ -253,7 +253,7 @@ protected function setUp(): void
         $this->output_stream = fopen('php://memory', 'rw');
         $this->clock = new RealtimeClock();
         $this->logger = new class extends AbstractLogger {
-            public function log($level, $message, array $context = [])
+            public function log($level, $message, array $context = []): void
             {
                 echo sprintf('[%s] %s'.PHP_EOL, $level, $message);
             }
diff --git a/test/integration/working_dir/factory-cronjob-runner.php b/test/integration/working_dir/factory-cronjob-runner.php
index 5f24707..782f666 100644
--- a/test/integration/working_dir/factory-cronjob-runner.php
+++ b/test/integration/working_dir/factory-cronjob-runner.php
@@ -12,7 +12,7 @@
 return new DefaultPdoCronjobRunnerFactory(
     DbMaintainer::makePdoConnection(),
     new class extends AbstractLogger {
-        public function log($level, $message, array $context = [])
+        public function log($level, $message, array $context = []): void
         {
             echo sprintf('[%s] %s'.PHP_EOL, $level, $message);
         }
diff --git a/test/mock/Logging/SpyingLoggerStub.php b/test/mock/Logging/SpyingLoggerStub.php
index 845f43b..04c083a 100644
--- a/test/mock/Logging/SpyingLoggerStub.php
+++ b/test/mock/Logging/SpyingLoggerStub.php
@@ -11,7 +11,7 @@ class SpyingLoggerStub extends AbstractLogger
 {
     protected $logs = [];
 
-    public function log($level, $message, array $context = [])
+    public function log($level, $message, array $context = []): void
     {
         $this->logs[] = ['level' => $level, 'message' => $message, 'context' => $context];
     }