diff --git a/src/Aspect/HttpClientAspect.php b/src/Aspect/HttpClientAspect.php
index 42699b5..40602ff 100644
--- a/src/Aspect/HttpClientAspect.php
+++ b/src/Aspect/HttpClientAspect.php
@@ -77,7 +77,7 @@ public function process(ProceedingJoinPoint $proceedingJoinPoint)
         try {
             $result = $proceedingJoinPoint->process();
             if ($result instanceof ResponseInterface) {
-                $span->setTag($this->spanTagManager->get('http_client', 'http.status_code'), $result->getStatusCode());
+                $span->setTag($this->spanTagManager->get('http_client', 'http.status_code'), (string) $result->getStatusCode());
             }
         } catch (Throwable $e) {
             if ($this->switchManager->isEnable('exception') && ! $this->switchManager->isIgnoreException($e)) {
diff --git a/src/Listener/RequestTraceListener.php b/src/Listener/RequestTraceListener.php
index 5cbf008..2ef8056 100644
--- a/src/Listener/RequestTraceListener.php
+++ b/src/Listener/RequestTraceListener.php
@@ -81,7 +81,7 @@ protected function handleRequestTerminated(RequestTerminated $event): void
             $this->appendExceptionToSpan($span, $exception = $event->exception);
 
             if ($exception instanceof HttpException) {
-                $span->setTag($this->spanTagManager->get('response', 'status_code'), $exception->getStatusCode());
+                $span->setTag($this->spanTagManager->get('response', 'status_code'), (string) $exception->getStatusCode());
             }
         }
 
diff --git a/src/Middleware/TraceMiddleware.php b/src/Middleware/TraceMiddleware.php
index 40009cc..f9ad3fb 100644
--- a/src/Middleware/TraceMiddleware.php
+++ b/src/Middleware/TraceMiddleware.php
@@ -77,7 +77,7 @@ protected function appendExceptionToSpan(Span $span, Throwable $exception): void
         $span->setTag('error', true);
         $span->setTag($this->spanTagManager->get('exception', 'class'), get_class($exception));
         $span->setTag($this->spanTagManager->get('exception', 'code'), $exception->getCode());
-        $span->setTag($this->spanTagManager->get('exception', 'message'), $exception->getMessage());
+        $span->setTag($this->spanTagManager->get('exception', 'message'), (string) $exception->getMessage());
         $span->setTag($this->spanTagManager->get('exception', 'stack_trace'), (string) $exception);
     }