diff --git a/src/ModelContextProtocol.Core/Client/SseClientSessionTransport.cs b/src/ModelContextProtocol.Core/Client/SseClientSessionTransport.cs
index 99bdc1eb9..3d69a93ef 100644
--- a/src/ModelContextProtocol.Core/Client/SseClientSessionTransport.cs
+++ b/src/ModelContextProtocol.Core/Client/SseClientSessionTransport.cs
@@ -90,7 +90,7 @@ public override async Task SendMessageAsync(
 
         using var httpRequestMessage = new HttpRequestMessage(HttpMethod.Post, _messageEndpoint);
         StreamableHttpClientSessionTransport.CopyAdditionalHeaders(httpRequestMessage.Headers, _options.AdditionalHeaders, sessionId: null, protocolVersion: null);
-        var response = await _httpClient.SendAsync(httpRequestMessage, message, cancellationToken).ConfigureAwait(false);
+        using var response = await _httpClient.SendAsync(httpRequestMessage, message, cancellationToken).ConfigureAwait(false);
 
         if (!response.IsSuccessStatusCode)
         {