diff --git a/lib/swd.c b/lib/swd.c
index 5ea5cba..a7f458c 100644
--- a/lib/swd.c
+++ b/lib/swd.c
@@ -177,8 +177,8 @@ bool swd_set_pins(uint32_t swclk_port, uint32_t swclk_pin, uint32_t swdio_port,
 	rcc_periph_clock_enable(swd_swclk_rcc); // enable clock for GPIO peripheral for clock signal
 	gpio_set(swd_swclk_port, swd_swclk_pin); // inactive clock is high
 	gpio_mode_setup(swd_swclk_port, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, swd_swclk_pin); // the host controls the clock
-	//gpio_set_output_options(swd_swclk_port, GPIO_OTYPE_PP, GPIO_OSPEED_25MHZ, swd_swclk_pin); // set SWCLK pin output as push-pull
-	gpio_set_output_options(swd_swclk_port, GPIO_OTYPE_OD, GPIO_OSPEED_25MHZ, swd_swclk_pin); // set SWCLK pin output as open-drain (with external pull-up)
+	//gpio_set_output_options(swd_swclk_port, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, swd_swclk_pin); // set SWCLK pin output as push-pull
+	gpio_set_output_options(swd_swclk_port, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ, swd_swclk_pin); // set SWCLK pin output as open-drain (with external pull-up)
 	rcc_periph_clock_enable(swd_swdio_rcc); // enable clock for GPIO peripheral for data signal
 	gpio_set(swd_swdio_port, swd_swdio_pin); // inactive data is high (resetting the target when clock is active)
 	gpio_mode_setup(swd_swdio_port, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, swd_swdio_pin); // the data signal is half duplex, with the host controlling who is driving the data signal when
@@ -462,9 +462,9 @@ void TIM_ISR(SWD_TIMER)(void)
 				swd_bits_out &= ~(1ULL << swd_bits_i); // clear bit
 			}
 			swd_bits_i++;
-			gpio_set_output_options(swd_swclk_port, GPIO_OTYPE_PP, GPIO_OSPEED_25MHZ, swd_swclk_pin); // we need an extremely sharp rising edge
+			gpio_set_output_options(swd_swclk_port, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, swd_swclk_pin); // we need an extremely sharp rising edge
 			gpio_set(swd_swclk_port, swd_swclk_pin); // output rising clock edge
-			gpio_set_output_options(swd_swclk_port, GPIO_OTYPE_OD, GPIO_OSPEED_25MHZ, swd_swclk_pin); // go back to open-drain once we are high
+			gpio_set_output_options(swd_swclk_port, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ, swd_swclk_pin); // go back to open-drain once we are high
 		}
 		edge_falling = !edge_falling; // remember opposite upcoming edge
 	} else { // no other interrupt should occur