diff --git a/lib/CMT2300a/cmt_spi3.c b/lib/CMT2300a/cmt_spi3.c
index 464701f68..409782a1d 100644
--- a/lib/CMT2300a/cmt_spi3.c
+++ b/lib/CMT2300a/cmt_spi3.c
@@ -3,7 +3,7 @@
 #include <driver/spi_master.h>
 #include <esp_rom_gpio.h> // for esp_rom_gpio_connect_out_signal
 
-#define CMT_SPI_CLK 1000000 // 1 MHz
+#define CMT_SPI_CLK 4000000 // 4 MHz
 
 spi_device_handle_t spi_reg, spi_fifo;