diff --git a/components/esp32/include/esp_wifi_types.h b/components/esp32/include/esp_wifi_types.h
index a453c427b..2588d5d6a 100644
--- a/components/esp32/include/esp_wifi_types.h
+++ b/components/esp32/include/esp_wifi_types.h
@@ -402,7 +402,7 @@ typedef struct {
     wifi_pkt_rx_ctrl_t rx_ctrl;/**< received packet radio metadata header of the CSI data */
     uint8_t mac[6];            /**< source MAC address of the CSI data */
     bool last_word_invalid;    /**< last four bytes of the CSI data is invalid or not */
-    uint8_t *buf;              /**< buffer of CSI data */
+    int8_t *buf;               /**< buffer of CSI data */
     uint16_t len;              /**< length of CSI data */
 } wifi_csi_info_t;
 
diff --git a/components/esp32/lib b/components/esp32/lib
index 0bfda8bbf..9b9a3b35f 160000
--- a/components/esp32/lib
+++ b/components/esp32/lib
@@ -1 +1 @@
-Subproject commit 0bfda8bbf6a804298b357614f5f215248c36bce3
+Subproject commit 9b9a3b35f0c3d069ca5780bfe4ab876eac02262c