diff --git a/server/server.go b/server/server.go
index 6411e71..b209d00 100644
--- a/server/server.go
+++ b/server/server.go
@@ -73,8 +73,8 @@ func New(factory Factory, options *Options) (*Server, error) {
 		options: options,
 
 		upgrader: &websocket.Upgrader{
-			ReadBufferSize:  1024,
-			WriteBufferSize: 1024,
+			ReadBufferSize:  4096,
+			WriteBufferSize: 4096,
 			Subprotocols:    webtty.Protocols,
 			CheckOrigin:     originChekcer,
 		},
diff --git a/webtty/webtty.go b/webtty/webtty.go
index ed4f8b9..30a5137 100644
--- a/webtty/webtty.go
+++ b/webtty/webtty.go
@@ -42,7 +42,7 @@ func New(masterConn Master, slave Slave, options ...Option) (*WebTTY, error) {
 		columns:     0,
 		rows:        0,
 
-		bufferSize: 1024,
+		bufferSize: 4096,
 	}
 
 	for _, option := range options {