diff --git a/src/ContainerRegistry.php b/src/ContainerRegistry.php
index aae2d3b..323988b 100644
--- a/src/ContainerRegistry.php
+++ b/src/ContainerRegistry.php
@@ -38,7 +38,7 @@ public function getHandler(string $jobType): HandlerInterface
     private function className(string $jobType): string
     {
         $names = \explode('.', $jobType);
-        $names = \array_map(fn (string $value) => $this->inflector->classify($value), $names);
+        $names = \array_map(fn (string $value): string => $this->inflector->classify($value), $names);
 
         return \implode('\\', $names);
     }
diff --git a/tests/Interceptor/Push/CoreTest.php b/tests/Interceptor/Push/CoreTest.php
index 0b3b1dc..c09d6bd 100644
--- a/tests/Interceptor/Push/CoreTest.php
+++ b/tests/Interceptor/Push/CoreTest.php
@@ -30,7 +30,7 @@ public function testCallActionWithNullOptions(mixed $payload): void
         }
 
         $queue->shouldReceive('push')->once()
-            ->withArgs(fn(string $name, mixed $p = [], ?OptionsInterface $options = null) => $name === 'foo'
+            ->withArgs(fn(string $name, mixed $p = [], ?OptionsInterface $options = null): bool => $name === 'foo'
                 && $payload === $p
                 && $options instanceof Options,
             );
@@ -80,7 +80,7 @@ public function testCallWithTracerContext(): void
         $tracer->shouldReceive('trace')->once()->andReturnUsing(fn($name, $callback) => $callback());
 
         $queue->shouldReceive('push')->once()
-            ->withArgs(fn(string $name, array $payload = [], ?OptionsInterface $options = null) => $name === 'foo'
+            ->withArgs(fn(string $name, array $payload = [], ?OptionsInterface $options = null): bool => $name === 'foo'
                 && $payload === ['baz' => 'baf']
                 && $options->getHeader('foo') === ['bar']);
 
@@ -103,7 +103,7 @@ public function testCallWithTracerContextWitoutOptionsWithHeadersSupport(): void
         $tracer->shouldNotReceive('getContext');
 
         $queue->shouldReceive('push')->once()
-            ->withArgs(fn(string $name, array $payload = [], ?OptionsInterface $options = null) => $name === 'foo'
+            ->withArgs(fn(string $name, array $payload = [], ?OptionsInterface $options = null): bool => $name === 'foo'
                 && $payload === ['baz' => 'baf']
                 && $options !== null);