diff --git a/src/Anthropic/Platform/Anthropic.php b/src/Anthropic/Platform/Anthropic.php
index ce405095..891823b6 100644
--- a/src/Anthropic/Platform/Anthropic.php
+++ b/src/Anthropic/Platform/Anthropic.php
@@ -16,7 +16,7 @@
 
     public function __construct(
         HttpClientInterface $httpClient,
-        private string $apiKey,
+        #[\SensitiveParameter] private string $apiKey,
     ) {
         $this->httpClient = $httpClient instanceof EventSourceHttpClient ? $httpClient : new EventSourceHttpClient($httpClient);
     }
diff --git a/src/OpenAI/Platform/Azure.php b/src/OpenAI/Platform/Azure.php
index 25a2d716..3b0a5f78 100644
--- a/src/OpenAI/Platform/Azure.php
+++ b/src/OpenAI/Platform/Azure.php
@@ -18,7 +18,7 @@ public function __construct(
         private string $baseUrl,
         private string $deployment,
         private string $apiVersion,
-        private string $key,
+        #[\SensitiveParameter] private string $apiKey,
     ) {
         $this->httpClient = $httpClient instanceof EventSourceHttpClient ? $httpClient : new EventSourceHttpClient($httpClient);
     }
@@ -29,7 +29,7 @@ protected function rawRequest(string $endpoint, array $body): ResponseInterface
 
         return $this->httpClient->request('POST', $url, [
             'headers' => [
-                'api-key' => $this->key,
+                'api-key' => $this->apiKey,
                 'Content-Type' => 'application/json',
             ],
             'query' => ['api-version' => $this->apiVersion],
diff --git a/src/OpenAI/Platform/OpenAI.php b/src/OpenAI/Platform/OpenAI.php
index 43280107..b3d4bfde 100644
--- a/src/OpenAI/Platform/OpenAI.php
+++ b/src/OpenAI/Platform/OpenAI.php
@@ -15,7 +15,7 @@
 
     public function __construct(
         HttpClientInterface $httpClient,
-        private string $apiKey,
+        #[\SensitiveParameter] private string $apiKey,
     ) {
         $this->httpClient = $httpClient instanceof EventSourceHttpClient ? $httpClient : new EventSourceHttpClient($httpClient);
     }
diff --git a/src/Store/Azure/SearchStore.php b/src/Store/Azure/SearchStore.php
index 6a1cb6c2..dfc5e77b 100644
--- a/src/Store/Azure/SearchStore.php
+++ b/src/Store/Azure/SearchStore.php
@@ -19,7 +19,7 @@
     public function __construct(
         private HttpClientInterface $httpClient,
         private string $endpointUrl,
-        private string $apiKey,
+        #[\SensitiveParameter] private string $apiKey,
         private string $indexName,
         private string $apiVersion,
         private string $vectorFieldName = 'vector',
diff --git a/src/Voyage/Platform/Voyage.php b/src/Voyage/Platform/Voyage.php
index 6f03058e..b23dac28 100644
--- a/src/Voyage/Platform/Voyage.php
+++ b/src/Voyage/Platform/Voyage.php
@@ -11,7 +11,7 @@
 {
     public function __construct(
         private HttpClientInterface $httpClient,
-        private string $apiKey,
+        #[\SensitiveParameter] private string $apiKey,
     ) {
     }