diff --git a/stm32/aioc-fw/Inc/tusb_config.h b/stm32/aioc-fw/Inc/tusb_config.h
index a1eb73f..583ec4a 100644
--- a/stm32/aioc-fw/Inc/tusb_config.h
+++ b/stm32/aioc-fw/Inc/tusb_config.h
@@ -101,8 +101,8 @@
 #define CFG_TUD_DFU_RUNTIME       1
 
 // CDC FIFO size of TX and RX
-#define CFG_TUD_CDC_RX_BUFSIZE   128
-#define CFG_TUD_CDC_TX_BUFSIZE   128
+#define CFG_TUD_CDC_RX_BUFSIZE   256
+#define CFG_TUD_CDC_TX_BUFSIZE   256
 
 // CDC Endpoint transfer buffer size, more is faster
 #define CFG_TUD_CDC_EP_BUFSIZE   64