diff --git a/mcp/src/main/java/io/modelcontextprotocol/client/transport/HttpClientSseClientTransport.java b/mcp/src/main/java/io/modelcontextprotocol/client/transport/HttpClientSseClientTransport.java
index a5bdd43e2..87f8c39ea 100644
--- a/mcp/src/main/java/io/modelcontextprotocol/client/transport/HttpClientSseClientTransport.java
+++ b/mcp/src/main/java/io/modelcontextprotocol/client/transport/HttpClientSseClientTransport.java
@@ -152,9 +152,8 @@ public HttpClientSseClientTransport(HttpClient.Builder clientBuilder, HttpReques
 		this.baseUri = baseUri;
 		this.sseEndpoint = sseEndpoint;
 		this.objectMapper = objectMapper;
-		this.httpClient = clientBuilder.connectTimeout(Duration.ofSeconds(10)).build();
+		this.httpClient = clientBuilder.version(HttpClient.Version.HTTP_1_1).connectTimeout(Duration.ofSeconds(10)).build();
 		this.requestBuilder = requestBuilder;
-
 		this.sseClient = new FlowSseClient(this.httpClient, requestBuilder);
 	}