diff --git a/composer.json b/composer.json
index 298ddee..b0db656 100644
--- a/composer.json
+++ b/composer.json
@@ -28,11 +28,10 @@
   "require-dev": {
     "doctrine/dbal": "^3.0",
     "friends-of-phpspec/phpspec-expect": "^4.0",
-    "open-telemetry/transport-grpc": "^1.0",
     "open-telemetry/gen-otlp-protobuf": "^1.0",
     "php-http/httplug": "^2.3",
     "phpspec/phpspec": "^7.5",
-    "phpstan/phpstan": "<1.11",
+    "phpstan/phpstan": "^1.4",
     "symfony/framework-bundle": "*",
     "symfony/http-client": "*",
     "symfony/messenger": "*",
diff --git a/src/Bridge/GoogleCloud/Logging/Formatter/StdOutFormatter.php b/src/Bridge/GoogleCloud/Logging/Formatter/StdOutFormatter.php
index 2cd6b34..3d157d6 100644
--- a/src/Bridge/GoogleCloud/Logging/Formatter/StdOutFormatter.php
+++ b/src/Bridge/GoogleCloud/Logging/Formatter/StdOutFormatter.php
@@ -45,30 +45,32 @@ protected function normalize(mixed $data, int $depth = 0): mixed
             $data['severity'] = $data['level_name'];
             unset($data['level_name']);
 
-            // Map tracing
-            if (isset($data['context']['trace'])) {
-                $data['logging.googleapis.com/trace'] = 'projects/'.$this->project.'/traces/'.$data['context']['trace'];
-            }
-            if (isset($data['context']['span'])) {
-                $data['logging.googleapis.com/spanId'] = $data['context']['span'];
-            }
-            if (isset($data['context']['sampled'])) {
-                $data['logging.googleapis.com/trace_sampled'] = $data['context']['sampled'];
-            }
-            if (isset($data['context']['operation'])) {
-                $data['logging.googleapis.com/operation'] = $data['context']['operation'];
+            if (\is_array($data['context'])) {
+                // Map tracing
+                if (isset($data['context']['trace'])) {
+                    $data['logging.googleapis.com/trace'] = 'projects/'.$this->project.'/traces/'.$data['context']['trace'];
+                }
+                if (isset($data['context']['span'])) {
+                    $data['logging.googleapis.com/spanId'] = $data['context']['span'];
+                }
+                if (isset($data['context']['sampled'])) {
+                    $data['logging.googleapis.com/trace_sampled'] = $data['context']['sampled'];
+                }
+                if (isset($data['context']['operation'])) {
+                    $data['logging.googleapis.com/operation'] = $data['context']['operation'];
+                }
+                unset($data['context']['trace'], $data['context']['span'], $data['context']['sampled'], $data['context']['operation']);
+
+                if ($exception = $data['context']['exception'] ?? false) {
+                    $data['message'] = $exception['message'];
+                    $data['context'] = array_merge($data['context'], $exception['context']);
+                    unset($data['context']['exception']);
+                }
             }
-            unset($data['context']['trace'], $data['context']['span'], $data['context']['sampled'], $data['context']['operation']);
 
             // Map channel
             $data['logging.googleapis.com/labels'] = ['channel' => $data['channel']];
             unset($data['channel']);
-
-            if ($exception = $data['context']['exception'] ?? false) {
-                $data['message'] = $exception['message'];
-                $data['context'] = array_merge($data['context'], $exception['context']);
-                unset($data['context']['exception']);
-            }
         }
 
         return $data;
diff --git a/src/Metrics/CounterAdapter.php b/src/Metrics/CounterAdapter.php
index d76fc2f..8334bd8 100644
--- a/src/Metrics/CounterAdapter.php
+++ b/src/Metrics/CounterAdapter.php
@@ -12,6 +12,8 @@
 
 class CounterAdapter implements CounterInterface
 {
+    use IterableAttributesTrait;
+
     public function __construct(
         private string $name,
         private string $description,
@@ -20,11 +22,12 @@ public function __construct(
     }
 
     /**
-     * @param int                                $amount
-     * @param array{labels: array<string,mixed>} $attributes
+     * @param int                                  $amount
+     * @param iterable<string,array<string,mixed>> $attributes
      */
     public function add($amount, iterable $attributes = [], $context = null): void
     {
+        $attributes = $this->normalizeAttributes($attributes);
         /** @var array<string> $labelNames */
         $labelNames = array_keys($attributes['labels'] ?? []);
         $labelValues = array_values($attributes['labels'] ?? []);
diff --git a/src/Metrics/HistogramAdapter.php b/src/Metrics/HistogramAdapter.php
index 4088a4c..6bad420 100644
--- a/src/Metrics/HistogramAdapter.php
+++ b/src/Metrics/HistogramAdapter.php
@@ -13,6 +13,8 @@
 
 class HistogramAdapter implements HistogramInterface
 {
+    use IterableAttributesTrait;
+
     public function __construct(
         private string $name,
         private string $description,
@@ -25,6 +27,7 @@ public function __construct(
      */
     public function record($amount, iterable $attributes = [], $context = null): void
     {
+        $attributes = $this->normalizeAttributes($attributes);
         /** @var array<string> $labelNames */
         $labelNames = array_keys($attributes['labels'] ?? []);
         $labelValues = array_values($attributes['labels'] ?? []);
diff --git a/src/Metrics/IterableAttributesTrait.php b/src/Metrics/IterableAttributesTrait.php
new file mode 100644
index 0000000..161684c
--- /dev/null
+++ b/src/Metrics/IterableAttributesTrait.php
@@ -0,0 +1,26 @@
+<?php
+
+/*
+ * This file is part of the worldia/instrumentation-bundle package.
+ * (c) Worldia <developers@worldia.com>
+ */
+
+namespace Instrumentation\Metrics;
+
+trait IterableAttributesTrait
+{
+    /**
+     * @param iterable<string,array<string,mixed>> $attributes
+     *
+     * @return array<string,array<string,mixed>>
+     */
+    public function normalizeAttributes(iterable $attributes): array
+    {
+        $newAttr = [];
+        foreach ($attributes as $key => $value) {
+            $newAttr[$key] = $value;
+        }
+
+        return $newAttr;
+    }
+}
diff --git a/src/Metrics/UpDownCounterAdapter.php b/src/Metrics/UpDownCounterAdapter.php
index 8d64be2..21f2655 100644
--- a/src/Metrics/UpDownCounterAdapter.php
+++ b/src/Metrics/UpDownCounterAdapter.php
@@ -12,6 +12,8 @@
 
 class UpDownCounterAdapter implements UpDownCounterInterface
 {
+    use IterableAttributesTrait;
+
     public function __construct(
         private string $name,
         private string $description,
@@ -25,6 +27,7 @@ public function __construct(
      */
     public function add($amount, iterable $attributes = [], $context = null): void
     {
+        $attributes = $this->normalizeAttributes($attributes);
         /** @var array<string> $labelNames */
         $labelNames = array_keys($attributes['labels'] ?? []);
         $labelValues = array_values($attributes['labels'] ?? []);